Photogenerated cathodic tiv thaiv cov khoom ntawm Ag/NiS/TiO2 nanocomposites

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TiO2 yog cov khoom siv semiconductor siv rau kev hloov pauv photoelectric.Txhawm rau txhim kho lawv txoj kev siv lub teeb, npib tsib xee thiab nyiaj sulfide nanoparticles tau tsim nyob rau saum npoo ntawm TiO2 nanowires los ntawm txoj kev yooj yim dipping thiab photoreduction.Cov kev tshawb fawb ntawm cathodic tiv thaiv kev ua ntawm Ag / NiS / TiO2 nanocomposites ntawm 304 stainless hlau tau ua tiav, thiab cov morphology, muaj pes tsawg leeg, thiab lub teeb nqus cov yam ntxwv ntawm cov ntaub ntawv tau ntxiv.Cov txiaj ntsig tau pom tias qhov npaj Ag / NiS / TiO2 nanocomposites tuaj yeem muab kev tiv thaiv cathodic zoo tshaj plaws rau 304 stainless hlau thaum tus naj npawb ntawm nickel sulfide impregnation-ua nag lossis daus yog 6 thiab nyiaj nitrate photoreduction concentration yog 0.1M.
Daim ntawv thov n-hom semiconductors rau kev tiv thaiv photocathode siv lub hnub ci tau dhau los ua cov ntsiab lus kub hauv xyoo tas los no.Thaum zoo siab los ntawm lub hnub ci, electrons los ntawm valence band (VB) ntawm cov khoom siv semiconductor yuav zoo siab rau hauv cov khoom siv hluav taws xob (CB) los tsim cov hluav taws xob photogenerated.Yog hais tias qhov conduction band muaj peev xwm ntawm lub semiconductor los yog nanocomposite yog qhov tsis zoo tshaj qhov nws tus kheej-etching peev xwm ntawm cov hlau khi, cov photogenerated electrons yuav hloov mus rau saum npoo ntawm cov hlau khi.Kev sib sau ntawm electrons yuav ua rau cathodic polarization ntawm cov hlau thiab muab kev tiv thaiv cathodic ntawm cov hlau txuam nrog 1,2,3,4,5,6,7.Cov khoom siv semiconductor yog theoretically suav hais tias yog ib qho uas tsis yog-sacrificial photoanode, vim cov tshuaj tiv thaiv anodic tsis degrade cov khoom semiconductor nws tus kheej, tab sis oxidation ntawm dej los ntawm photogenerated qhov los yog adsorbed organic pollutants, los yog muaj cov collectors mus cuab photogenerated qhov.Qhov tseem ceeb tshaj plaws, cov khoom siv semiconductor yuav tsum muaj CB lub peev xwm uas tsis zoo tshaj qhov muaj peev xwm corrosion ntawm cov hlau tiv thaiv.Tsuas yog tom qab ntawd cov photogenerated electrons tuaj yeem dhau los ntawm cov kab hluav taws xob ntawm cov semiconductor mus rau cov hlau tiv thaiv. Cov kev tshawb fawb txog kev tiv thaiv kev tiv thaiv photochemical tau tsom mus rau cov khoom siv hluav taws xob n-hom semiconductor nrog qhov dav dav (3.0-3.2EV) 1,2,3,4,5,6,7, uas tsuas yog teb rau lub teeb ci ultraviolet (< 400 nm), txo qhov muaj lub teeb. Cov kev tshawb fawb txog kev tiv thaiv kev tiv thaiv photochemical tau tsom mus rau cov khoom siv hluav taws xob n-hom semiconductor nrog qhov dav dav (3.0-3.2EV) 1,2,3,4,5,6,7, uas tsuas yog teb rau lub teeb ci ultraviolet (< 400 nm), txo qhov muaj lub teeb. Исследования стойкости к фотохимической коррозии были сосредоточены на неорганических полупроводниковый - мат запрещенной зоной (3,0–3,2 EV)1,2,3,4,5,6,7, которые реагируют только на ультрафиолетовое излучетуние (< 0 thiab sвета. Kev tshawb fawb ntawm photochemical corrosion kuj tau tsom mus rau n-hom inorganic semiconductor cov ntaub ntawv nrog lub dav bandgap (3.0–3.2 EV) 1,2,3,4,5,6,7 uas tsuas teb rau ultraviolet hluav taws xob (< 400 nm), txo lub teeb muaj.光化学耐腐蚀性研究主要集中在具有宽带隙(3.0–3.2EV) 1,2,3,4,5,6,7 的无机n 型半寐丐 上无机n 型半寐丐对紫外光 (< 400 nm) 有响应,减少光的可用性。光化学耐腐蚀性研究主要在具有宽带隙宽带隙 (3.0–3.2ev) 1.2,3,4,7,6,上 , 这些 材料 仅 对 (<400 nm) 有 有 有 有 有 有 有 有 有 有 有响应,减少光的可用性。 Исследования стойкости к фотохимической коррозии в основном были сосредоточены на неорганических полупратровы с широкой запрещенной зоной (3,0–3,2EV)1,2,3,4,5,6,7, которые чувствительны только к УФ-излучению (<мествительны). Kev tshawb fawb ntawm photochemical corrosion kuj tau tsom mus rau dav bandgap (3.0–3.2EV) 1,2,3,4,5,6,7 n-hom inorganic semiconductor cov ntaub ntawv uas tsuas yog nkag siab rau UV hluav taws xob.(<400 nm).Hauv kev teb, qhov muaj ntawm lub teeb txo qis.
Hauv kev tiv thaiv marine corrosion, photoelectrochemical cathodic tiv thaiv technology plays lub luag haujlwm tseem ceeb.TiO2 yog cov khoom siv semiconductor nrog UV lub teeb pom kev zoo thiab cov khoom siv photocatalytic.Txawm li cas los xij, vim qhov tsawg ntawm kev siv lub teeb, photogenerated electron qhov recombine yooj yim thiab tsis tuaj yeem tiv thaiv hauv qhov tsaus ntuj.Kev tshawb fawb ntxiv yog xav tau los nrhiav kev daws teeb meem tsim nyog thiab ua tau.Nws tau raug tshaj tawm tias ntau txoj kev hloov kho saum npoo tuaj yeem siv los txhim kho cov duab ntawm TiO2, xws li doping nrog Fe, N, thiab sib xyaw nrog Ni3S2, Bi2Se3, CdTe, thiab lwm yam. Yog li ntawd, TiO2 sib xyaw nrog cov khoom siv nrog kev hloov pauv photoelectric siab tau dav siv hauv kev tiv thaiv photogenerated cathodic..
Nickel sulfide yog cov khoom siv semiconductor nrog qhov sib txawv ntawm qhov nqaim ntawm tsuas yog 1.24 eV8.9.Qhov nqaim ntawm qhov sib txawv band, lub zog siv lub teeb.Tom qab cov nickel sulfide tov nrog titanium dioxide nto, qhov kev siv lub teeb tuaj yeem nce ntxiv.Ua ke nrog titanium dioxide, nws tuaj yeem txhim kho kev sib cais ntawm photogenerated electrons thiab qhov.Nickel sulfide yog dav siv nyob rau hauv electrocatalytic hydrogen ntau lawm, roj teeb thiab paug decomposition8,9,10.Txawm li cas los xij, nws siv hauv kev tiv thaiv photocathode tseem tsis tau tshaj tawm.Hauv txoj kev tshawb no, cov khoom siv nqaim bandgap semiconductor raug xaiv los daws qhov teeb meem ntawm kev siv lub teeb TiO2 tsawg.Nickel thiab nyiaj sulfide nanoparticles tau khi rau ntawm qhov chaw ntawm TiO2 nanowires los ntawm kev immersion thiab photoreduction txoj kev, feem.Lub Ag/NiS/TiO2 nanocomposite txhim kho lub teeb siv efficiency thiab txuas ntxiv lub teeb haum ntawm thaj tsam ultraviolet mus rau thaj tsam pom.Meanwhile, cov deposition ntawm nyiaj nanoparticles muab cov Ag / NiS / TiO2 nanocomposite zoo heev kho qhov muag stability thiab ruaj khov cathodic tiv thaiv.
Ua ntej, titanium ntawv ci 0.1 hli tuab nrog purity ntawm 99.9% raug txiav mus rau qhov loj ntawm 30 hli × 10 hli rau kev sim.Tom qab ntawd, txhua qhov chaw ntawm titanium ntawv ci tau polished 100 zaug nrog 2500 grit sandpaper, thiab tom qab ntawd ntxuav nrog acetone, kiag li ethanol, thiab dej distilled.Muab cov phaj titanium tso rau hauv qhov sib tov ntawm 85 ° C (sodium hydroxide: sodium carbonate: dej = 5: 2: 100) rau 90 min, tshem tawm thiab yaug nrog dej distilled.Qhov saum npoo tau etched nrog HF tov (HF: H2O = 1:5) rau 1 min, ces ntxuav alternated nrog acetone, ethanol, thiab dej distilled, thiab thaum kawg qhuav rau siv.Titanium dioxide nanowires tau tsim sai sai rau saum npoo ntawm titanium ntawv ci los ntawm txheej txheem anodizing ib-kauj ruam.Rau anodizing, ib txwm siv ob-electrode system, kev ua haujlwm electrode yog daim ntawv titanium, thiab lub txee electrode yog platinum electrode.Muab cov phaj titanium tso rau hauv 400 ml ntawm 2 M NaOH tov nrog electrode clamps.DC fais fab mov tam sim no ruaj khov ntawm li 1.3 A. Qhov kub ntawm cov tshuaj tau khaws cia ntawm 80 ° C rau 180 feeb thaum lub sij hawm cov tshuaj tiv thaiv kab mob.Cov ntawv titanium raug muab tshem tawm, ntxuav nrog acetone thiab ethanol, ntxuav nrog dej distilled, thiab qhuav lawm.Tom qab ntawd cov qauv tau muab tso rau hauv lub qhov cub kub ntawm 450 ° C (qhov kub ntawm 5 ° C / min), khaws cia ntawm qhov kub thiab txias rau 120 min, thiab muab tso rau hauv lub tais kom qhuav.
Cov nickel sulfide-titanium dioxide composite tau los ntawm txoj kev yooj yim thiab yooj yim dip-deposition.Ua ntej, npib tsib xee nitrate (0.03 M) tau yaj hauv ethanol thiab khaws cia hauv qab sib nqus nplawm rau 20 feeb kom tau txais cov tshuaj ethanol ntawm nickel nitrate.Tom qab ntawd npaj sodium sulfide (0.03 M) nrog tov tov ntawm methanol (methanol: dej = 1: 1).Tom qab ntawd, cov ntsiav tshuaj titanium dioxide tau muab tso rau hauv cov tshuaj npaj saum toj no, tshem tawm tom qab 4 feeb, thiab sai sai ntxuav nrog cov tshuaj tov ntawm methanol thiab dej (methanol: dej = 1: 1) rau 1 feeb.Tom qab qhov saum npoo tau qhuav lawm, cov ntsiav tshuaj tau muab tso rau hauv lub qhov cub muffle, rhuab hauv lub tshuab nqus tsev ntawm 380 ° C rau 20 min, txias rau chav sov, thiab qhuav.Number of cycles 2, 4, 6 thiab 8.
Ag nanoparticles modified Ag/NiS/TiO2 nanocomposites by photoreduction12,13.Qhov tshwm sim Ag / NiS / TiO2 nanocomposite tau muab tso rau hauv cov nyiaj nitrate uas tsim nyog rau kev sim.Tom qab ntawd cov qauv raug irradiated nrog lub teeb ultraviolet rau 30 feeb, lawv cov chaw raug ntxuav nrog dej deionized, thiab Ag / NiS / TiO2 nanocomposites tau los ntawm ntuj qhuav.Cov txheej txheem sim piav qhia saum toj no yog qhia hauv daim duab 1.
Ag/NiS/TiO2 nanocomposites tau raug tshwj xeeb los ntawm teb emission scanning electron microscopy (FESEM), zog dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), thiab diffuse reflectance nyob rau hauv lub ultraviolet thiab pom ntau yam (UV-Vis).FESEM tau ua los ntawm Nova NanoSEM 450 microscope (FEI Corporation, USA).Accelerating voltage 1 kV, qhov loj me 2.0.Cov cuab yeej siv CBS sojntsuam kom tau txais cov khoom siv hluav taws xob thib ob thiab rov qab los rau kev txheeb xyuas qhov chaw.EMF tau ua los ntawm kev siv Oxford X-Max N50 EMF system (Oxford Instruments Technology Co., Ltd.) nrog rau qhov nrawm ntawm 15 kV thiab qhov chaw loj ntawm 3.0.Kev soj ntsuam zoo thiab ntau yam siv cov yam ntxwv X-rays.X-ray photoelectron spectroscopy tau ua nyob rau ntawm Escalab 250Xi spectrometer (Thermo Fisher Scientific Corporation, USA) ua haujlwm hauv lub zog ruaj khov nrog lub zog excitation ntawm 150 W thiab monochromatic Al Kα hluav taws xob (1486.6 eV) ua qhov zoo siab.Tag nrho cov scan ntau 0-1600 eV, tag nrho lub zog 50 eV, kauj ruam dav 1.0 eV, thiab cov pa roj carbon tsis zoo (~ 284.8 eV) tau siv los ua cov ntaub ntawv kho hluav taws xob kho.Lub zog dhau rau kev nqaim nqaim yog 20 eV nrog ib kauj ruam ntawm 0.05 eV.Diffuse reflectance spectroscopy nyob rau hauv cheeb tsam UV-pom pom tau ua rau ntawm Cary 5000 spectrometer (Varian, USA) nrog tus qauv barium sulfate phaj nyob rau hauv qhov ntsuas ntawm 10-80 °.
Hauv kev ua haujlwm no, muaj pes tsawg leeg (qhov hnyav feem pua) ntawm 304 stainless hlau yog 0.08 C, 1.86 Mn, 0.72 Si, 0.035 P, 0.029 s, 18.25 Cr, 8.5 Ni, thiab tus so yog Fe.10mm x 10mm x 10mm 304 stainless hlau, epoxy potted nrog 1 cm2 nthuav tawm thaj chaw.Nws nto yog sanded nrog 2400 grit silicon carbide sandpaper thiab ntxuav nrog ethanol.Tom qab ntawd cov hlau tsis muaj sonicated nyob rau hauv dej deionized rau 5 feeb thiab muab cia rau hauv qhov cub.
Hauv kev sim OCP, 304 stainless hlau thiab Ag / NiS / TiO2 photoanode tau muab tso rau hauv lub cell corrosion thiab photoanode cell, raws li (Fig. 2).Lub cell corrosion tau sau nrog 3.5% NaCl tov, thiab 0.25 M Na2SO3 tau nchuav rau hauv lub cell photoanode ua lub qhov ntxiab.Ob lub electrolytes tau sib cais los ntawm kev sib xyaw nrog naphthol membrane.OCP tau ntsuas ntawm qhov chaw ua haujlwm electrochemical (P4000+, USA).Cov khoom siv electrode yog saturated calomel electrode (SCE).Lub teeb ci (xenon teeb, PLS-SXE300C, Poisson Technologies Co., Ltd.) thiab lub phaj txiav 420 tau muab tso rau ntawm qhov hluav taws xob ntawm lub teeb ci, tso cai rau lub teeb pom kev dhau los ntawm quartz iav mus rau photoanode.Lub 304 stainless hlau electrode txuas nrog lub photoanode nrog ib tug tooj liab hlau.Ua ntej qhov kev sim, 304 stainless hlau electrode tau tsau rau hauv 3.5% NaCl tov rau 2 h kom ruaj khov.Thaum pib ntawm qhov kev sim, thaum lub teeb qhib thiab kaw, cov electrons zoo siab ntawm photoanode ncav cuag qhov chaw ntawm 304 stainless hlau los ntawm cov hlau.
Hauv kev sim ntawm photocurrent ceev, 304SS thiab Ag/NiS/TiO2 photoanodes tau muab tso rau hauv cov hlwb corrosion thiab photoanode hlwb, raws li (Fig. 3).Lub photocurrent ceev tau ntsuas ntawm tib lub teeb raws li OCP.Yuav kom tau txais qhov tseeb photocurrent ntom ntawm 304 stainless hlau thiab photoanode, lub potentiostat tau siv los ua xoom tsis kam ammeter los txuas 304 stainless hlau thiab photoanode nyob rau hauv cov xwm txheej tsis muaj polarized.Txhawm rau ua qhov no, cov ntaub ntawv siv thiab cov txee electrodes hauv kev sim teeb tsa tau luv luv, kom lub chaw ua haujlwm electrochemical ua haujlwm raws li xoom-kuj ammeter uas tuaj yeem ntsuas qhov tseeb tam sim no.Lub 304 stainless hlau electrode txuas nrog rau hauv av ntawm lub chaw ua haujlwm electrochemical, thiab cov photoanode txuas nrog rau kev ua haujlwm electrode clamp.Thaum pib ntawm qhov kev sim, thaum lub teeb qhib thiab tawm, cov electrons zoo siab ntawm photoanode los ntawm cov hlau mus txog qhov chaw ntawm 304 stainless hlau.Lub sijhawm no, kev hloov pauv ntawm qhov photocurrent ceev ntawm qhov chaw ntawm 304 stainless hlau tuaj yeem pom.
Txhawm rau kawm txog kev tiv thaiv cathodic ntawm nanocomposites ntawm 304 stainless hlau, kev hloov pauv hauv cov peev txheej photoionization ntawm 304 stainless hlau thiab nanocomposites, nrog rau kev hloov pauv hauv photoionization tam sim no ntom ntom ntawm nanocomposites thiab 304 stainless hlau, tau sim.
Ntawm daim duab.4 qhia tau hais tias kev hloov pauv hauv qhov qhib Circuit Court muaj peev xwm ntawm 304 stainless hlau thiab nanocomposites nyob rau hauv pom lub teeb irradiation thiab nyob rau hauv qhov tsaus ntuj.Ntawm daim duab.4a qhia txog kev cuam tshuam ntawm NiS lub sij hawm tso tawm los ntawm kev tso rau ntawm qhov qhib Circuit Court muaj peev xwm, thiab daim duab.4b qhia tau hais tias cov nyhuv ntawm cov nyiaj nitrate concentration ntawm qhov qhib Circuit Court muaj peev xwm thaum photoreduction.Ntawm daim duab.4a qhia tau hais tias qhov qhib Circuit Court muaj peev xwm ntawm NiS / TiO2 nanocomposite bonded rau 304 stainless hlau yog txo qis thaum lub sij hawm lub teeb yog tig rau piv rau cov nickel sulfide composite.Tsis tas li ntawd, qhov qhib Circuit Court muaj peev xwm tsis zoo dua li cov ntshiab TiO2 nanowires, qhia tau hais tias cov nickel sulfide composite tsim ntau electrons thiab txhim kho cov photocathode tiv thaiv los ntawm TiO2.Txawm li cas los xij, thaum kawg ntawm qhov raug, qhov tsis muaj peev xwm thauj khoom nce nrawm mus rau qhov tsis muaj peev xwm ntawm cov hlau tsis muaj zog, qhia tias cov nickel sulfide tsis muaj zog cia.Cov txiaj ntsig ntawm tus naj npawb ntawm cov immersion deposition cycles ntawm qhov qhib Circuit Court muaj peev xwm tuaj yeem pom hauv daim duab 4a.Thaum lub sij hawm tso nyiaj ntawm 6, lub peev xwm loj ntawm nanocomposite nce mus txog -550 mV txheeb ze rau saturated calomel electrode, thiab lub peev xwm ntawm nanocomposite tso los ntawm ib qho ntawm 6 yog qhov qis dua li ntawm nanocomposite nyob rau hauv lwm yam mob.Yog li, NiS / TiO2 nanocomposites tau txais tom qab 6 lub voj voog tso tawm tau muab kev tiv thaiv cathodic zoo tshaj plaws rau 304 stainless hlau.
Kev hloov hauv OCP ntawm 304 stainless hlau electrodes nrog NiS/TiO2 nanocomposites (a) thiab Ag/NiS/TiO2 nanocomposites (b) nrog thiab tsis muaj illumination (λ> 400 nm).
Raws li qhia hauv daim duab.4b, qhov qhib Circuit Court muaj peev xwm ntawm 304 stainless hlau thiab Ag / NiS / TiO2 nanocomposites tau txo qis thaum raug lub teeb.Tom qab deg deposition ntawm cov nyiaj nanoparticles, qhov qhib Circuit Court muaj peev xwm txo qis piv rau cov ntshiab TiO2 nanowires.Lub peev xwm ntawm NiS/TiO2 nanocomposite yog qhov tsis zoo, qhia tias cathodic tiv thaiv nyhuv ntawm TiO2 txhim kho tau zoo tom qab Ag nanoparticles tso.Qhov qhib Circuit Court muaj peev xwm nce sai heev thaum kawg ntawm qhov raug, thiab piv rau saturated calomel electrode, qhov qhib Circuit Court muaj peev xwm ncav cuag -580 mV, uas yog qis dua li ntawm 304 stainless hlau (-180 mV).Qhov tshwm sim no qhia tau hais tias cov nanocomposite muaj lub zog zoo heev khaws cia tom qab cov nyiaj tau muab tso rau ntawm nws qhov chaw.Ntawm daim duab.4b kuj qhia tau hais tias cov nyhuv ntawm cov nyiaj nitrate concentration ntawm qhov qhib Circuit Court muaj peev xwm.Ntawm ib qho nyiaj nitrate concentration ntawm 0.1 M, qhov txwv tsis pub muaj peev xwm txheeb ze rau saturated calomel electrode ncav cuag -925 mV.Tom qab 4 daim ntawv thov mus, lub peev xwm tseem nyob rau theem tom qab thawj daim ntawv thov, uas qhia tau hais tias kev ruaj ntseg zoo heev ntawm nanocomposite.Yog li, ntawm cov nyiaj nitrate concentration ntawm 0.1 M, qhov tshwm sim Ag / NiS / TiO2 nanocomposite muaj qhov zoo tshaj plaws cathodic tiv thaiv ntawm 304 stainless hlau.
NiS deposition nyob rau saum npoo ntawm TiO2 nanowires maj mam txhim kho nrog nce NiS deposition sij hawm.Thaum pom lub teeb tawm tsam qhov chaw ntawm nanowire, ntau cov nickel sulfide active chaw zoo siab los tsim cov khoom siv hluav taws xob, thiab lub peev xwm photoionization txo qis dua.Txawm li cas los xij, thaum nickel sulfide nanoparticles ntau dhau tso rau ntawm qhov chaw, zoo siab nickel sulfide txo qis, uas tsis ua rau lub teeb nqus.Tom qab cov nyiaj tau muab tso rau ntawm qhov chaw, vim yog cov nyhuv plasmon resonance ntawm cov nyiaj, cov khoom siv hluav taws xob yuav raug xa mus sai sai rau saum npoo ntawm 304 stainless hlau, uas ua rau muaj kev tiv thaiv zoo heev cathodic.Thaum cov nyiaj ntau dhau lawm tso rau ntawm qhov chaw, cov nyiaj tau los ua ib qho kev sib txuas rau photoelectrons thiab qhov, uas tsis ua rau cov tiam ntawm photoelectrons.Hauv kev xaus, Ag / NiS / TiO2 nanocomposites tuaj yeem muab kev tiv thaiv cathodic zoo tshaj plaws rau 304 stainless hlau tom qab 6-fold nickel sulfide deposition hauv qab 0.1 M nyiaj nitrate.
Tus nqi photocurrent ntom ntom sawv cev rau lub zog sib cais ntawm photogenerated electrons thiab qhov, thiab qhov ntau dua qhov photocurrent ntom, qhov sib cais zog ntawm photogenerated electrons thiab qhov muaj zog dua.Muaj ntau txoj kev tshawb fawb qhia tias NiS tau siv dav hauv kev sib txuas ntawm cov khoom siv photocatalytic los txhim kho cov khoom siv hluav taws xob ntawm cov khoom siv thiab cais qhov 15,16,17,18,19,20.Chen et al.kawm noble-hlau-dawb graphene thiab g-C3N4 composites co-hloov nrog NiS15.Qhov siab tshaj plaws ntawm cov photocurrent hloov kho g-C3N4 / 0.25% RGO / 3% NiS yog 0.018 μA / cm2.Chen et al.kawm CdSe-NiS nrog photocurrent ntom ntawm txog 10 µA / cm2.16.Liu et al.synthesized CdS @ NiS sib xyaw nrog photocurrent ntom ntawm 15 µA / cm218.Txawm li cas los xij, kev siv NiS rau kev tiv thaiv photocathode tseem tsis tau tshaj tawm.Hauv peb txoj kev tshawb fawb, qhov photocurrent ntom ntom ntawm TiO2 tau nce ntxiv los ntawm kev hloov kho NiS.Ntawm daim duab.5 qhia tau hais tias kev hloov pauv ntawm qhov photocurrent ntom ntawm 304 stainless hlau thiab nanocomposites nyob rau hauv cov teeb pom kev zoo thiab tsis muaj teeb pom kev zoo.Raws li qhia hauv daim duab.5a, photocurrent ceev ntawm NiS/TiO2 nanocomposite nce sai heev thaum lub sij hawm lub teeb yog tig rau, thiab lub photocurrent ceev yog zoo, qhia txog cov ntws ntawm electrons los ntawm nanocomposite rau saum npoo los ntawm electrochemical workstation.304 stainless hlau.Tom qab kev npaj cov nickel sulfide composites, qhov photocurrent ceev yog ntau dua li cov ntshiab TiO2 nanowires.Lub photocurrent ntom ntom ntawm NiS nce mus txog 220 μA / cm2, uas yog 6.8 npaug siab dua li TiO2 nanowires (32 μA / cm2), thaum NiS yog immersed thiab tso 6 zaug.Raws li qhia hauv daim duab.5b, qhov photocurrent ntom ntom ntawm Ag / NiS / TiO2 nanocomposite thiab 304 stainless hlau tau ntau dua ntawm cov ntshiab TiO2 thiab NiS / TiO2 nanocomposite thaum tig rau hauv qab lub teeb xenon.Ntawm daim duab.Daim duab 5b kuj qhia tau hais tias cov nyhuv ntawm AgNO concentration ntawm photocurrent ceev thaum lub sij hawm photoreduction.Ntawm qhov nyiaj nitrate concentration ntawm 0.1 M, nws qhov photocurrent ntom ncav cuag 410 μA / cm2, uas yog 12.8 npaug siab dua li TiO2 nanowires (32 μA / cm2) thiab 1.8 npaug siab dua NiS / TiO2 nanocomposites.Lub teb hluav taws xob heterojunction yog tsim ntawm Ag / NiS / TiO2 nanocomposite interface, uas pab txhawb kev sib cais ntawm photogenerated electrons los ntawm qhov.
Hloov cov photocurrent ceev ntawm 304 stainless hlau electrode nrog (a) NiS/TiO2 nanocomposite thiab (b) Ag/NiS/TiO2 nanocomposite nrog thiab tsis muaj illumination (λ> 400 nm).
Yog li, tom qab 6 lub voj voog ntawm nickel sulfide immersion-deposition hauv 0.1 M concentrated silver nitrate, photocurrent ntom ntawm Ag / NiS / TiO2 nanocomposites thiab 304 stainless hlau nce mus txog 410 μA / cm2, uas yog siab dua li ntawm saturated calomel.electrodes ncav cuag -925 mV.Raws li cov xwm txheej no, 304 stainless hlau ua ke nrog Ag / NiS / TiO2 tuaj yeem muab kev tiv thaiv cathodic zoo tshaj plaws.
Ntawm daim duab.6 qhia cov duab electron microscope ntawm cov ntshiab titanium dioxide nanowires, cov khoom sib xyaw nickel sulfide nanoparticles, thiab nyiaj nanoparticles nyob rau hauv kev pom zoo.Ntawm daim duab.6a, d qhia ntshiab TiO2 nanowires tau los ntawm ib-theem anodization.Qhov chaw faib khoom ntawm titanium dioxide nanowires yog sib xws, cov qauv ntawm nanowires nyob ze rau ib leeg, thiab qhov pore loj faib yog uniform.Daim duab 6b thiab e yog electron micrographs ntawm titanium dioxide tom qab 6-fold impregnation thiab deposition ntawm nickel sulfide composites.Los ntawm cov duab electron microscopic magnified 200,000 zaug hauv daim duab 6e, nws tuaj yeem pom tau tias cov nickel sulfide composite nanoparticles kuj yog homogeneous thiab muaj qhov loj me me ntawm li 100-120 nm inch.Qee cov nanoparticles tuaj yeem pom nyob rau hauv qhov chaw ntawm cov nanowires, thiab titanium dioxide nanowires pom meej.Ntawm daim duab.6c,f qhia electron microscopic dluab ntawm NiS/TiO2 nanocomposites ntawm AgNO concentration ntawm 0.1 M. Piv rau Fig.6b i siv.6e, siv.6c i siv.6f qhia tias Ag nanoparticles tso rau ntawm qhov chaw ntawm cov khoom sib xyaw, nrog rau Ag nanoparticles uniformly faib nrog ib txoj kab uas hla ntawm 10 nm.Ntawm daim duab.7 qhia txog ntu ntu ntawm Ag/NiS/TiO2 nanofilms raug rau 6 lub voj voog ntawm NiS dip deposition ntawm AgNO3 concentration ntawm 0.1 M. Los ntawm cov duab magnification siab, qhov ntsuas zaj duab xis thickness yog 240-270 nm.Yog li, npib tsib xee thiab nyiaj sulfide nanoparticles tau sib sau ua ke ntawm TiO2 nanowires.
Ntshiab TiO2 (a, d), NiS/TiO2 nanocomposites nrog 6 cycles ntawm NiS dip deposition (b, e) thiab Ag/NiS/NiS nrog 6 cycles ntawm NiS dip deposition ntawm 0.1 M AgNO3 SEM duab ntawm TiO2 nanocomposites (c, e).
Hla ntu ntawm Ag/NiS/TiO2 nanofilms raug rau 6 lub voj voog ntawm NiS dip deposition ntawm AgNO3 concentration ntawm 0.1 M.
Ntawm daim duab.8 qhia txog qhov chaw faib khoom saum npoo av ntawm Ag / NiS / TiO2 nanocomposites tau los ntawm 6 lub voj voog ntawm nickel sulfide dip deposition ntawm cov nyiaj nitrate concentration ntawm 0.1 M. Qhov kev faib tawm ntawm cov ntsiab lus qhia tau tias Ti, O, Ni, S thiab Ag tau kuaj pom.siv zog spectroscopy.Hais txog cov ntsiab lus, Ti thiab O yog cov ntsiab lus tshaj plaws hauv kev faib khoom, thaum Ni thiab S yog kwv yees li qub, tab sis lawv cov ntsiab lus qis dua Ag.Nws kuj tseem tuaj yeem ua pov thawj tias tus nqi ntawm cov khoom siv nyiaj nanoparticles ntau dua li cov nickel sulfide.Kev faib tawm tsis sib xws ntawm cov ntsiab lus ntawm qhov chaw qhia tias npib tsib xee thiab nyiaj sulfide yog sib koom ua ke ntawm TiO2 nanowires.X-ray photoelectron spectroscopic tsom xam kuj tau ua los txheeb xyuas qhov tshwj xeeb muaj pes tsawg leeg thiab khi lub xeev ntawm cov khoom.
Kev faib tawm ntawm cov ntsiab lus (Ti, O, Ni, S, thiab Ag) ntawm Ag / NiS / TiO2 nanocomposites ntawm AgNO3 concentration ntawm 0.1 M rau 6 lub voj voog ntawm NiS dip deposition.
Ntawm daim duab.Daim duab 9 qhia txog XPS spectra ntawm Ag/NiS/TiO2 nanocomposites tau siv 6 lub voj voog ntawm nickel sulfide deposition los ntawm immersion nyob rau hauv 0.1 M AgNO3, qhov twg daim duab.9a yog tag nrho cov spectrum, thiab tus so ntawm lub spectrum yog high-resolution spectra ntawm lub ntsiab.Raws li pom tau los ntawm tag nrho cov spectrum nyob rau hauv daim duab 9a, nqus peaks ntawm Ti, O, Ni, S, thiab Ag tau pom nyob rau hauv lub nanocomposite, uas proves lub hav zoov ntawm tsib lub ntsiab.Cov txiaj ntsig kev xeem tau ua raws li EDS.Lub ncov tshaj plaws hauv daim duab 9a yog cov pa roj carbon ncov siv los kho rau lub zog khi ntawm cov qauv.Ntawm daim duab.9b qhia txog kev daws teeb meem siab zog ntawm Ti.Qhov nqus siab tshaj plaws ntawm 2p orbitals yog nyob ntawm 459.32 thiab 465 eV, uas sib haum rau kev nqus ntawm Ti 2p3/2 thiab Ti 2p1/2 orbitals.Ob lub ncov nqus dej ua pov thawj tias titanium muaj Ti4 + valence, uas sib haum rau Ti hauv TiO2.
XPS spectra ntawm Ag/NiS/TiO2 ntsuas (a) thiab siab daws teeb meem XPS spectra ntawm Ti2p(b), O1s(c), Ni2p(d), S2p(e), thiab Ag 3d(f).
Ntawm daim duab.9d qhia tau hais tias muaj kev daws teeb meem siab Ni zog spectrum nrog plaub lub siab nqus rau Ni 2p orbital.Qhov nqus tau siab tshaj ntawm 856 thiab 873.5 eV sib haum rau Ni 2p3/2 thiab Ni 2p1/2 8.10 orbitals, qhov twg lub siab nqus tau yog NiS.Qhov nqus tau siab tshaj ntawm 881 thiab 863 eV yog rau nickel nitrate thiab yog tshwm sim los ntawm cov nickel nitrate reagent thaum ua piv txwv.Ntawm daim duab.9e qhia qhov kev daws teeb meem siab S-spectrum.Qhov nqus peaks ntawm S 2p orbitals yog nyob ntawm 161.5 thiab 168.1 eV, uas sib haum rau S 2p3/2 thiab S 2p1/2 orbitals 21, 22, 23, 24. Ob lub ncov no yog cov nickel sulfide compounds.Qhov nqus tau siab tshaj ntawm 169.2 thiab 163.4 eV yog rau sodium sulfide reagent.Ntawm daim duab.9f qhia tau hais tias Ag spectrum high-resolution nyob rau hauv uas 3d orbital absorption peaks ntawm cov nyiaj nyob ntawm 368.2 thiab 374.5 eV, raws li, thiab ob qhov nqus peaks sib haum rau qhov nqus orbits ntawm Ag 3d5 / 2 thiab Ag 3d3 / 21 qhov chaw muaj pov thawj. lub xeev ntawm elemental silver.Yog li, cov nanocomposites feem ntau yog tsim los ntawm Ag, NiS thiab TiO2, uas tau txiav txim los ntawm X-ray photoelectron spectroscopy, uas ua pov thawj tias npib tsib xee thiab nyiaj sulfide nanoparticles tau ua tiav ua ke ntawm TiO2 nanowires.
Ntawm daim duab.10 qhia UV-VIS diffuse reflectance spectra ntawm cov tshiab npaj TiO2 nanowires, NiS/TiO2 nanocomposites, thiab Ag/NiS/TiO2 nanocomposites.Nws tuaj yeem pom los ntawm daim duab tias qhov nqus nqus ntawm TiO2 nanowires yog li 390 nm, thiab lub teeb absorbed feem ntau yog concentrated nyob rau hauv cheeb tsam ultraviolet.Nws tuaj yeem pom los ntawm daim duab tias tom qab kev sib xyaw ntawm npib tsib xee thiab nyiaj sulfide nanoparticles ntawm titanium dioxide nanowires 21, 22, lub teeb absorbed propagates rau thaj tsam pom.Nyob rau tib lub sijhawm, nanocomposite tau nce UV nqus, uas cuam tshuam nrog qhov sib txawv ntawm cov nickel sulfide.Qhov nqaim ntawm qhov sib txawv ntawm qhov sib txawv, qhov qis dua lub zog thaiv rau kev hloov hluav taws xob thiab qhov siab dua qhov kev siv lub teeb.Tom qab muab cov NiS/TiO2 nto nrog nyiaj nanoparticles, qhov nqus siv thiab lub teeb wavelength tsis nce ntau, feem ntau yog vim cov nyhuv ntawm plasmon resonance ntawm cov nyiaj nanoparticles.Kev nqus wavelength ntawm TiO2 nanowires tsis zoo txhim kho piv rau qhov nqaim ntawm qhov sib txawv ntawm cov khoom sib xyaw NiS nanoparticles.Hauv cov ntsiab lus, tom qab sib xyaw nickel sulfide thiab nyiaj nanoparticles nyob rau saum npoo ntawm titanium dioxide nanowires, nws cov yam ntxwv ntawm lub teeb pom kev zoo tuaj yeem txhim kho, thiab lub teeb nqus tau txuas ntxiv los ntawm ultraviolet mus rau pom lub teeb, uas txhim kho kev siv tus nqi ntawm titanium dioxide nanowires.lub teeb uas txhim kho cov khoom muaj peev xwm tsim cov photoelectrons.
UV/Vis diffuse reflectance spectra of new TiO2 nanowires, NiS/TiO2 nanocomposites, and Ag/NiS/TiO2 nanocomposites.
Ntawm daim duab.11 qhia cov txheej txheem ntawm photochemical corrosion kuj ntawm Ag / NiS / TiO2 nanocomposites nyob rau hauv pom lub teeb irradiation.Raws li qhov muaj peev xwm faib ntawm cov nyiaj nanoparticles, npib tsib xee sulfide, thiab cov kab hluav taws xob ntawm titanium dioxide, daim ntawv qhia ua tau ntawm cov txheej txheem ntawm kev tiv thaiv corrosion yog npaj.Vim hais tias cov conduction band muaj peev xwm ntawm nanosilver tsis zoo piv rau npib tsib xee sulfide, thiab conduction band muaj peev xwm ntawm npib tsib xee sulfide yog tsis zoo piv rau titanium dioxide, cov kev taw qhia ntawm electron txaus yog roughly Ag → NiS → TiO2 → 304 stainless hlau.Thaum lub teeb yog irradiated nyob rau saum npoo ntawm nanocomposite, vim cov nyhuv ntawm nto plasmon resonance ntawm nanosilver, nanosilver yuav sai sai tsim photogenerated qhov thiab electrons, thiab photogenerated electrons sai sai txav los ntawm valence band txoj hauj lwm mus rau conduction band txoj hauj lwm vim excitation.Titanium dioxide thiab nickel sulfide.Txij li thaum lub conductivity ntawm nyiaj nanoparticles yog ntau tsis zoo tshaj li cov nickel sulfide, electrons nyob rau hauv lub TS ntawm nyiaj nanoparticles yog sai hloov mus rau TS ntawm nickel sulfide.Lub peev xwm conduction ntawm npib tsib xee sulfide yog qhov tsis zoo ntau dua li ntawm titanium dioxide, yog li cov electrons ntawm nickel sulfide thiab conductivity ntawm cov nyiaj tau nrawm nrawm hauv CB ntawm titanium dioxide.Cov khoom tsim hluav taws xob tsim hluav taws xob tau ncav cuag qhov chaw ntawm 304 stainless hlau los ntawm titanium matrix, thiab cov khoom siv hluav taws xob muaj zog koom nrog cov txheej txheem cathodic oxygen txo ntawm 304 stainless hlau.Cov txheej txheem no txo ​​cov cathodic cov tshuaj tiv thaiv thiab tib lub sijhawm suppresses cov tshuaj tiv thaiv anodic dissolution ntawm 304 stainless hlau, yog li paub txog cathodic tiv thaiv ntawm stainless hlau 304. Vim yog tsim cov hluav taws xob teb ntawm heterojunction nyob rau hauv Ag / NiS / TiO2 nanocomposite, lub conductive muaj peev xwm ntawm nanocomposite 4 txoj hauj lwm zoo dua, kev tiv thaiv cathodic ntau dua. stainless hlau.
Schematic daim duab ntawm cov txheej txheem photoelectrochemical anti-corrosion ntawm Ag / NiS / TiO2 nanocomposites nyob rau hauv pom lub teeb.
Hauv kev ua haujlwm no, npib tsib xee thiab nyiaj sulfide nanoparticles tau tsim nyob rau saum npoo ntawm TiO2 nanowires los ntawm ib qho yooj yim immersion thiab photoreduction txoj kev.Cov kev tshawb fawb txog kev tiv thaiv cathodic ntawm Ag / NiS / TiO2 nanocomposites ntawm 304 stainless hlau tau ua tiav.Raws li cov yam ntxwv morphological, kev tsom xam ntawm qhov muaj pes tsawg leeg thiab kev tsom xam ntawm cov yam ntxwv ntawm lub teeb pom kev zoo, cov ntsiab lus hauv qab no tau ua tiav:
Nrog ib tug xov tooj ntawm impregnation-deposition voj voog ntawm nickel sulfide ntawm 6 thiab ib tug concentration ntawm nyiaj nitrate rau photoreduction ntawm 0.1 mol / l, lub resulting Ag / NiS / TiO2 nanocomposites muaj ib tug zoo cathodic tiv thaiv nyhuv ntawm 304 stainless hlau.Piv nrog rau saturated calomel electrode, kev tiv thaiv muaj peev xwm ncav cuag -925 mV, thiab kev tiv thaiv tam sim no nce mus txog 410 μA / cm2.
Ib qho hluav taws xob heterojunction yog tsim ntawm Ag / NiS / TiO2 nanocomposite interface, uas txhim kho lub zog sib cais ntawm cov hluav taws xob photogenerated thiab qhov.Nyob rau tib lub sijhawm, kev siv lub teeb pom kev zoo tau nce ntxiv thiab qhov kev nqus ntawm lub teeb tau txuas ntxiv los ntawm thaj tsam ultraviolet mus rau thaj tsam pom.Lub nanocomposite tseem yuav khaws nws lub xeev qub nrog kev ruaj ntseg zoo tom qab 4 lub voj voog.
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Post lub sij hawm: Sep-14-2022