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TiO2 bụ ihe semiconductor ejiri mee mgbanwe fotoelectric.Iji meziwanye ojiji nke ìhè ha, nickel na silver sulfide nanoparticles na-emepụta n'elu TiO2 nanowires site na ntinye dị mfe na usoro photoreduction.A na-eme usoro ọmụmụ ihe nchebe cathodic nke Ag/NiS/TiO2 nanocomposites na 304 igwe anaghị agba nchara, na morphology, mejupụtara, na ìhè absorption àgwà nke ihe agbakwunyere.Nsonaazụ na-egosi na Ag / NiS / TiO2 nanocomposites a kwadebere nwere ike inye nchebe cathodic kacha mma maka 304 igwe anaghị agba nchara mgbe ọnụ ọgụgụ nke nickel sulfide impregnation-ụda cycles bụ 6 na ọlaọcha nitrate photoreduction mkpokọta bụ 0.1M.
Ngwa nke n-ụdị semiconductors maka nchekwa fotocathode site na iji ìhè anyanwụ aghọwo isiokwu na-ekpo ọkụ n'afọ ndị na-adịbeghị anya.Mgbe ìhè anyanwụ na-akpali akpali, electrons sitere na valence band (VB) nke ihe semiconductor ga-enwe mmasị n'ime band conduction (CB) iji mepụta electrons a na-emepụta.Ọ bụrụ na ike nke conduction band ike nke semiconductor ma ọ bụ nanocomposite dị njọ karịa onwe-etching ike nke agbụ ígwè, ndị a photogenerated eletrọn ga-ebufe n'elu nke agbụ ígwè.Mkpokọta nke electrons ga-eduga na cathodic polarization nke metal ma nye nchebe cathodic nke metal metụtara1,2,3,4,5,6,7.A na-ewere ihe semiconductor dị ka fotoanode na-adịghị achụ àjà, ebe ọ bụ na mmeghachi omume anodic adịghị emebi ihe semiconductor n'onwe ya, ma oxidation nke mmiri site na oghere ndị a na-emepụta ma ọ bụ ihe ndị na-emepụta ihe na-emepụta ihe, ma ọ bụ ọnụnọ nke ndị na-anakọta ihe iji jide oghere ndị a na-emepụta.Nke kachasị mkpa, ihe semiconductor ga-enwerịrị ikike CB nke na-adịghị mma karịa ikike mmebi nke ígwè a na-echebe.Naanị mgbe ahụ ka electron ndị a na-emepụta nwere ike isi na eriri conduction nke semiconductor gaa na metal echedoro. Photochemical corrosion eguzogide ọmụmụ lekwasịrị anya na inorganic n-ụdị semiconductor ihe na wide band gaps (3.0-3.2EV) 1,2,3,4,5,6,7, bụ nanị na-anabata ultraviolet ìhè (<400 nm), ibelata nnweta nke ìhè. Photochemical corrosion eguzogide ọmụmụ lekwasịrị anya na inorganic n-ụdị semiconductor ihe na wide band gaps (3.0-3.2EV) 1,2,3,4,5,6,7, bụ nanị na-anabata ultraviolet ìhè (<400 nm), ibelata nnweta nke ìhè. Исследования стойкости ирокой запрещенной зоной (3,0–3,2 EV)1,2,3,4,5,6,7, которые реагируют только на ультрафиолетовое ультрафиолетовое ние доступности света. Nnyocha na nguzogide corrosion photochemical lekwasịrị anya na n-ụdị inorganic semiconductor ihe nwere bandgap sara mbara (3.0-3.2 EV) 1,2,3,4,5,6,7 nke na-anabata naanị radieshon ultraviolet (<400 nm), belata nnweta ọkụ.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料仅对紫外光(< 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 宽带有 宽带隙料 上 , 这些 材料 仅 对 (<400 nm) 有 有 有减少光的可用性. Исследования стойкости к фотохимической корррозии в основном были сосредоточеnы n-типа с широкой запрещенной зоной (3,0–3,2EV)1,2,3,4,5,6,7, которые чувствительны только к УФ-ию (4) . Nchoputa na nguzogide corrosion photochemical lekwasịrị anya na bandgap sara mbara (3.0-3.2EV) 1,2,3,4,5,6,7 n-ụdị inorganic semiconductor ihe na-enwe mmetụta naanị maka radieshon UV.(<400 nm).Na nzaghachi, nnweta ọkụ na-ebelata.
N'ihe gbasara nchebe corrosion mmiri, teknụzụ nchebe fotoelectrochemical cathodic na-arụ ọrụ dị mkpa.TiO2 bụ ihe semiconductor nwere ezigbo nnabata ọkụ UV yana njirimara fotocatalytic.Agbanyeghị, n'ihi obere ojiji nke ọkụ, oghere elektrọn emepụtara na-agbakọta ngwa ngwa na enweghị ike ichebe ya n'okpuru ọnọdụ gbara ọchịchịrị.Ọ dị mkpa nyocha ọzọ iji chọta azịza ezi uche dị na ya nke ga-ekwe omume.A na-akọ na ọtụtụ ụzọ mgbanwe elu elu nwere ike iji meziwanye fotoensitivity nke TiO2, dị ka doping na Fe, N, na ịgwakọta na Ni3S2, Bi2Se3, CdTe, wdg Ya mere, TiO2 composite na ihe na elu photoelectric ngbanwe arụmọrụ na-ọtụtụ ebe na-eji na ubi nke photogenerated cathodic nchebe..
Nickel sulfide bụ ihe semiconductor nwere oghere dị warara nke naanị 1.24 eV8.9.Ka ọdịiche nke band ahụ dị warara, otú ahụ ka ojiji ọkụ na-esiwanye ike.Mgbe agwakọtachara sulfide nickel na elu titanium dioxide, ogo ojiji ọkụ nwere ike ịbawanye.Ejikọtara ya na titanium dioxide, ọ nwere ike imeziwanye arụmọrụ nkewa nke electrons na oghere.A na-eji nickel sulfide eme ihe n'ọtụtụ ebe na mmepụta hydrogen electrocatalytic, batrị na decomposition na-emerụ emerụ8,9,10.Agbanyeghị, ejibeghị ya na nchekwa fotocathode ka akọpụtabeghị.N'ime ọmụmụ ihe a, ahọpụtara ihe semiconductor bandgap dị warara iji dozie nsogbu nke nrụpụta ọkụ TiO2 dị ala.Nickel na ọlaọcha sulfide nanoparticles na-ejikọta n'elu TiO2 nanowires site n'imikpu na photoreduction ụzọ, n'otu n'otu.Ag/NiS/TiO2 nanocomposite na-eme ka ọrụ ọkụ na-arụ ọrụ na-arụ ọrụ na-eme ka ọ dịkwuo ọkụ ma gbasaa ọkụ ọkụ site na mpaghara ultraviolet gaa na mpaghara a na-ahụ anya.Ka ọ dị ugbu a, ntinye nke nanoparticles ọlaọcha na-enye Ag/NiS/TiO2 nanocomposite ezigbo nkwụsi ike anya yana nchebe cathodic kwụsiri ike.
Nke mbụ, a na-egbutu foil titanium 0.1 mm na ịdị ọcha nke 99.9% na nha nke 30 mm × 10 mm maka nnwale.Mgbe ahụ, a na-asachapụ elu nke ọ bụla nke foil titanium ugboro 100 na mpempe akwụkwọ 2500 grit, wee jiri acetone, ethanol zuru oke, na mmiri dị nro na-asa ya nke ọma.Debe efere titanium na ngwakọta nke 85 Celsius C (sodium hydroxide: sodium carbonate: mmiri = 5: 2: 100) maka 90 min, wepụ ma kpochaa ya na mmiri distilled.A na-ekpuchi elu ya na ngwọta HF (HF: H2O = 1: 5) maka 1 min, wee saa ya ọzọ na acetone, ethanol, na mmiri distilled, ma mesịa kpọọ nkụ maka ojiji.A na-emepụta nanowires titanium dioxide ngwa ngwa n'elu foil titanium site na usoro anoding nke otu nzọụkwụ.Maka anodizing, a na-eji usoro abụọ-electrode omenala eme ihe, electrode na-arụ ọrụ bụ mpempe akwụkwọ titanium, na counter electrode bụ electrode platinum.Debe efere titanium na 400 ml nke 2M NaOH ngwọta na electrode clamps.Igwe ọkụ ọkụ DC dị ugbu a kwụsiri ike na ihe dịka 1.3 A. A na-edobe okpomọkụ nke ngwọta na 80 Celsius maka nkeji 180 n'oge mmeghachi omume sistemu.A na-ewepụta mpempe akwụkwọ titanium ahụ, jiri acetone na ethanol sachaa ya, jiri mmiri na-ekpo ọkụ na-asa ya ma kpoo ya nke ọma.Mgbe ahụ, a na-etinye ihe nlele ahụ n'ime ọkụ ọkụ na-ekpo ọkụ na 450 ° C (ọnụọgụ ọkụ 5 ° C / min), na-edebe okpomọkụ mgbe niile maka 120 min, ma tinye ya na tray ihicha.
E nwetara ihe mejupụtara nickel sulfide-titanium dioxide site n'ụzọ dị mfe ma dị mfe itinye ntinye.Nke mbụ, nickel nitrate (0.03 M) gbazere na ethanol ma debe ya n'okpuru mkpali magnetik maka nkeji 20 iji nweta ngwọta ethanol nke nickel nitrate.Mgbe ahụ, kwadebe sodium sulfide (0.03 M) na ngwọta ngwakọta nke methanol (methanol: mmiri = 1: 1).Mgbe ahụ, a na-etinye mbadamba titanium dioxide n'ime ngwọta a kwadebere n'elu, wepụ ya mgbe nkeji 4 gasịrị, ma saa ya ngwa ngwa na ngwọta nke methanol na mmiri (methanol: mmiri = 1: 1) maka nkeji 1.Mgbe elu ahụ akpọnwụchara, a na-etinye mbadamba nkume ndị ahụ n'ime ọkụ muffle, na-ekpo ọkụ na 380 ° C maka 20 min, dị jụụ na ụlọ okpomọkụ, ma kpoo ya.Ọnụọgụ nke okirikiri 2, 4, 6 na 8.
Ag nanoparticles gbanwere Ag/NiS/TiO2 nanocomposites site na fotoreduction12,13.A na-etinye Ag / NiS / TiO2 nanocomposite nke sitere na ngwọta nitrate ọlaọcha dị mkpa maka nnwale ahụ.Mgbe ahụ, a na-eji ọkụ ultraviolet mee ihe nlele ahụ maka 30 min, a na-eji mmiri na-ekpo ọkụ na-ehicha elu ha, na Ag / NiS / TiO2 nanocomposites nwetara site na ihicha eke.Usoro nnwale akọwara n'elu ka egosiri na eserese 1.
Ag/NiS/TiO2 nanocomposites e ji mara ubi emission scanning eletrọn microscopy (FESEM), ike dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), na mgbasa echiche na ultraviolet na anya nso (UV-Vis).Emere FESEM site na iji Nova NanoSEM 450 microscope (FEI Corporation, USA).Voltaji na-eme ngwa ngwa 1 kV, nha ntụpọ 2.0.Ngwaọrụ ahụ na-eji nyocha CBS na-anata eletrọn nke abụọ na azụ azụ azụ maka nyocha topography.Emere EMF site na iji sistemu Oxford X-Max N50 EMF (Oxford Instruments Technology Co., Ltd.) yana voltaji na-agba ọsọ nke 15 kV na nha ntụpọ nke 3.0.Nyocha qualitative na quantitative site na iji X-ray mara mma.Emere X-ray photoelectron spectroscopy na Escalab 250Xi spectrometer (Thermo Fisher Scientific Corporation, USA) na-arụ ọrụ na ọnọdụ ike a kapịrị ọnụ yana ike mkpali nke 150 W na monochromatic Al Kα radieshon (1486.6 eV) dị ka ihe mkpali.Oke nyocha zuru oke 0-1600 eV, ngụkọta ike 50 eV, obosara nzọụkwụ 1.0 eV, na carbon adịghị ọcha (~ 284.8 eV) ka ejiri mee ihe nrụtụ aka mgbazi ụgwọ ike.Ike ngafe maka nyocha dị warara bụ 20 eV yana nzọụkwụ nke 0.05 eV.A na-eme ihe nleba anya nlegharị anya na mpaghara UV na-ahụ anya na Cary 5000 spectrometer (Varian, USA) nke nwere efere barium sulfate ọkọlọtọ n'ogo nyocha nke 10-80°.
N'ime ọrụ a, ihe mejupụtara (pasent arọ) nke 304 igwe anaghị agba nchara bụ 0.08 C, 1.86 Mn, 0.72 Si, 0.035 P, 0.029 s, 18.25 Cr, 8.5 Ni, na ndị ọzọ bụ Fe.10mm x 10mm x 10mm 304 igwe anaghị agba nchara, epoxy nwere oghere 1 cm2 ekpughere.Ejiri akwụkwọ sandpaper silicon carbide 2400 grit kpuchie elu ya ma were ethanol saa ya.A na-agbanye igwe anaghị agba nchara na mmiri deionized maka nkeji 5 wee chekwaa ya na oven.
Na nnwale OCP, 304 igwe anaghị agba nchara na Ag / NiS / TiO2 photoanode na-etinye n'ime cell corrosion na cell photoanode, n'otu n'otu (Fig 2).Mkpụrụ ndụ corrosion jupụtara na ngwọta 3.5% NaCl, na 0.25 M Na2SO3 wụsara n'ime cell photoanode dị ka ọnyà oghere.E kewapụrụ electrolytes abụọ ahụ na ngwakọta na-eji akpụkpọ anụ naphthol.A tụrụ OCP na ebe a na-arụ ọrụ electrochemical (P4000+, USA).Eletrọd ntụaka ahụ bụ electrode calomel zuru ezu (SCE).A na-etinye ọkụ ọkụ ( oriọna xenon, PLS-SXE300C, Poisson Technologies Co., Ltd.) na mpempe akwụkwọ 420 na-apụ apụ na nkwụsị nke ìhè ọkụ, na-ekwe ka ìhè a na-ahụ anya gafere site na quartz iko na photoanode.Ejikọtara igwe anaghị agba nchara 304 na fotoanode na waya ọla kọpa.Tupu nnwale ahụ, igwe anaghị agba nchara 304 etinyere na 3.5% NaCl ngwọta maka awa 2 iji hụ na ọnọdụ kwụ ọtọ.Na mmalite nke nnwale ahụ, mgbe ọkụ na-agbanye ma gbanyụọ, electrons nwere obi ụtọ nke fotoanode na-eru n'elu 304 igwe anaghị agba nchara site na waya.
Na nnwale na njupụta foto ugbu a, 304SS na Ag / NiS / TiO2 photoanodes na-etinye na sel corrosion na mkpụrụ ndụ fotoanode, n'otu n'otu (Fig 3).A tụrụ njupụta foto ugbu a n'otu nhazi ahụ dịka OCP.Iji nweta njupụta foto dị ugbu a n'etiti igwe anaghị agba nchara 304 na fotoanode, a na-eji potentiostat mee ihe dị ka ammeter na-eguzogide efu iji jikọọ 304 igwe anaghị agba nchara na photoanode n'okpuru ọnọdụ ndị na-abụghị polarized.Iji mee nke a, akwụkwọ ntụaka na counter electrodes na nhazi nnwale ahụ dị mkpụmkpụ, nke mere na ebe ọrụ electrochemical na-arụ ọrụ dị ka ammeter na-eguzogide efu nke nwere ike ịlele ezi njupụta dị ugbu a.A na-ejikọta 304 igwe anaghị agba nchara nchara na ala nke ụlọ ọrụ electrochemical, na fotoanode na-ejikọta ya na eriri electrode na-arụ ọrụ.Na mmalite nke nnwale ahụ, mgbe ọkụ na-agbanye ma gbanyụọ, electrons nwere obi ụtọ nke fotoanode site na waya na-eru n'elu 304 igwe anaghị agba nchara.N'oge a, enwere ike ịhụ mgbanwe na njupụta foto nke dị n'elu 304 igwe anaghị agba nchara.
Iji mụọ ọrụ nchebe cathodic nke nanocomposites na 304 igwe anaghị agba nchara, a nwalere mgbanwe nke fotoionization ikike nke 304 igwe anaghị agba nchara na nanocomposites, yana mgbanwe na photoionization njupụta ugbu a n'etiti nanocomposites na 304 igwe anaghị agba nchara, nwalere.
Na fig.4 na-egosi mgbanwe na ike sekit mepere emepe nke 304 igwe anaghị agba nchara na nanocomposites n'okpuru ọkụ ọkụ a na-ahụ anya na n'okpuru ọnọdụ gbara ọchịchịrị.Na fig.4a na-egosi mmetụta nke oge nkwụnye ego NiS site na imikpu na ike sekit mepere emepe, na fig.4b na-egosi mmetụta nke ntinye nitrate ọlaọcha na ike sekit mepere emepe n'oge photoreduction.Na fig.4a na-egosi na ikike sekit mepere emepe nke NiS/TiO2 nanocomposite jikọtara ya na igwe anaghị agba nchara 304 na-ebelata nke ukwuu n'oge a na-agbanye oriọna ma e jiri ya tụnyere nickel sulfide composite.Tụkwasị na nke ahụ, ikike sekit mepere emepe dị njọ karịa nke TiO2 nanowires dị ọcha, na-egosi na ihe mejupụtara nickel sulfide na-emepụta ọtụtụ electrons ma na-eme ka mmetụta nchebe photocathode dịkwuo mma site na TiO2.Otú ọ dị, na njedebe nke ikpughe, ikike enweghị ibu na-ebili ngwa ngwa na enweghị ike nke igwe anaghị agba nchara, na-egosi na nickel sulfide adịghị enwe mmetụta nchekwa ike.Enwere ike ịhụ mmetụta nke ọnụ ọgụgụ nke usoro ntinye ntinye nke imikpu na ikike sekit mepere emepe na Fig. 4a.N'oge nkwụnye ego nke 6, ikike dị ukwuu nke nanocomposite ruru -550 mV n'ihe metụtara electrode calomel jupụtara, na ikike nke nanocomposite na-echekwa site na ihe nke 6 dị ntakịrị karịa nke nanocomposite n'okpuru ọnọdụ ndị ọzọ.Ya mere, NiS / TiO2 nanocomposites nwetara mgbe usoro ntinye ntinye 6 nyere nchebe cathodic kacha mma maka 304 igwe anaghị agba nchara.
Mgbanwe na OCP nke 304 igwe anaghị agba nchara na NiS/TiO2 nanocomposites (a) na Ag/NiS/TiO2 nanocomposites (b) na na-enweghị ìhè (λ> 400 nm).
Dị ka e gosiri na fig.4b, ikike imeghe nke 304 igwe anaghị agba nchara na Ag / NiS / TiO2 nanocomposites belatara nke ukwuu mgbe ekpughere ya.Mgbe elu deposition nke ọlaọcha nanoparticles, na-emeghe sekit ike belatara nke ukwuu ma e jiri ya tụnyere TiO2 nanowires dị ọcha.Ike nke NiS/TiO2 nanocomposite dị njọ karị, na-egosi na mmetụta nchebe cathodic nke TiO2 na-eme ka ọ dịkwuo mma mgbe a na-edebe Ag nanoparticles.Ike sekit mepere emepe mụbara ngwa ngwa na njedebe nke ikpughe, ma e jiri ya tụnyere calomel electrode juru eju, ikike nke oghere nwere ike iru -580 mV, nke dị ala karịa nke 304 igwe anaghị agba nchara (-180 mV).Nsonaazụ a na-egosi na nanocomposite nwere mmetụta nchekwa ike dị ịrịba ama mgbe a na-edebe ihe ọlaọcha n'elu ya.Na fig.4b na-egosikwa mmetụta nke mkpokọta nitrate ọlaọcha na ike sekit mepere emepe.Na mkpokọta nitrate ọlaọcha nke 0.1 M, ikike mmachi nwere ike ikwu na calomel electrode juru eju ruru -925 mV.Mgbe usoro ngwa ngwa 4 gasịrị, ikike ahụ nọgidere na ọkwa mgbe ngwa mbụ gasịrị, nke na-egosi nkwụsi ike dị mma nke nanocomposite.Ya mere, na ntinye nitrate ọlaọcha nke 0.1 M, Ag / NiS / TiO2 nanocomposite na-arụpụta nwere mmetụta nchebe cathodic kasị mma na 304 igwe anaghị agba nchara.
Ndokwa NiS n'elu TiO2 nanowires na-eji nwayọọ nwayọọ na-akawanye mma na-abawanye oge ntinye NiS.Mgbe ìhè a na-ahụ anya na-adaba n'elu nanowire, saịtị ndị na-arụ ọrụ nickel sulfide na-enwe mmasị ịmepụta electrons, na ike photoionization na-ebelata karịa.Otú ọ dị, mgbe nickel sulfide nanoparticles na-nanoparticles gabiga ókè na-edobere n'elu, nickel sulfide obi ụtọ na-ebelata kama, nke na-adịghị eme ka ìhè absorption.Mgbe a na-edebe ihe ndị ahụ ọlaọcha n'elu, n'ihi mmetụta resonance nke plasmon nke mkpụrụ ego ọlaọcha, a ga-ebufe electron ndị a na-emepụta ngwa ngwa n'elu 304 igwe anaghị agba nchara, na-eme ka nchebe cathodic dị mma.Mgbe a na-edobe ọtụtụ mkpụrụ ego ọlaọcha n'elu, ihe ndị ahụ ọlaọcha na-aghọ ebe nchịkọta maka fotoelectrons na oghere, nke na-adịghị etinye aka na ọgbọ nke photoelectrons.N'ikpeazụ, Ag / NiS / TiO2 nanocomposites nwere ike inye nchebe cathodic kasị mma maka 304 igwe anaghị agba nchara mgbe 6-fold nickel sulfide deposition n'okpuru 0.1 M silver nitrate.
Uru njupụta foto ugbu a na-anọchi anya ikewapụ ike nke elektrọn na oghere foto, yana njupụta foto ugbu a ka ukwuu, ike ikewapụ elektrọn na oghere dị ike.Enwere ọtụtụ ọmụmụ na-egosi na a na-eji NiS eme ihe n'ọtụtụ ebe na njikọ nke ihe ndị na-emepụta fotocatalytic iji meziwanye ihe ndị na-emepụta foto na-emepụta ihe na iji kewaa oghere15,16,17,18,19,20.Chen et al.mụọ graphene na-enweghị ọla na ihe mejupụtara g-C3N4 jikọtara ya na NiS15.Ike kachasị nke foto ugbu a nke g-C3N4/0.25% RGO/3%NiS bụ 0.018 μA/cm2.Chen et al.mụọ CdSe-NiS site na njupụta foto nke ihe dị ka 10 µA/cm2.16.Liu et al.mebere CdS@NiS composite nwere njupụta foto ugbu a nke 15 µA/cm218.Agbanyeghị, a kọbeghị iji NiS maka nchekwa fotocathode.N'ime ọmụmụ ihe anyị, njupụta foto nke TiO2 mụbara nke ukwuu site na mgbanwe nke NiS.Na fig.5 na-egosi mgbanwe na njupụta foto nke 304 igwe anaghị agba nchara na nanocomposites n'okpuru ọnọdụ ọkụ a na-ahụ anya na-enweghị ìhè.Dị ka e gosiri na fig.5a, njupụta foto nke NiS / TiO2 nanocomposite na-abawanye ngwa ngwa n'oge a na-agbanye ọkụ, na njupụta nke foto dị mma, na-egosi nrịba nke electrons site na nanocomposite gaa n'elu site na electrochemical workstation.304 igwe anaghị agba nchara.Mgbe nkwadebe nke nickel sulfide composites, fotocurrent njupụta dị ukwuu karịa nke TiO2 nanowires dị ọcha.Njupụta foto ugbu a nke NiS ruru 220 μA/cm2, nke bụ 6.8 ugboro dị elu karịa nke TiO2 nanowires (32 μA/cm2), mgbe NiS na-emikpu ma tinye ya ugboro 6.Dị ka e gosiri na fig.5b, njupụta foto dị n'etiti Ag/NiS/TiO2 nanocomposite na 304 igwe anaghị agba nchara dị elu karịa n'etiti TiO2 dị ọcha na NiS/TiO2 nanocomposite mgbe agbanyere n'okpuru oriọna xenon.Na fig.Ọnụ ọgụgụ 5b na-egosikwa mmetụta nke ntinye uche AgNO na njupụta foto ugbu a n'oge photoreduction.Na nitrate ọlaọcha nke 0.1 M, njupụta foto ya na-erute 410 μA / cm2, nke bụ 12.8 ugboro dị elu karịa nke TiO2 nanowires (32 μA / cm2) na 1.8 ugboro dị elu karịa nke NiS / TiO2 nanocomposites.A na-emepụta oghere eletrik heterojunction na Ag / NiS / TiO2 nanocomposite interface, nke na-eme ka ikewapụ electrons ndị a na-emepụta na oghere.
Mgbanwe na njupụta foto ugbu a nke igwe anaghị agba nchara 304 nwere (a) NiS/TiO2 nanocomposite na (b) Ag/NiS/TiO2 nanocomposite na enweghị ọkụ (λ> 400 nm).
Ya mere, mgbe 6 cycles nke nickel sulfide immersion-deposition na 0.1 M lekwasịrị ọlaọcha nitrate, photocurrent njupụta n'etiti Ag / NiS / TiO2 nanocomposites na 304 igwe anaghị agba nchara ruru 410 μA / cm2, nke dị elu karịa nke juju calomel.electrodes ruru -925 mV.N'okpuru ọnọdụ ndị a, igwe anaghị agba nchara 304 jikọtara Ag / NiS / TiO2 nwere ike inye nchebe cathodic kacha mma.
Na fig.6 na-egosi onyonyo microscope elu eletrọn nke titanium dioxide nanowires dị ọcha, ihe mejupụtara nickel sulfide nanoparticles, na nanoparticles ọlaọcha n'okpuru ọnọdụ kacha mma.Na fig.6a, d show TiO2 nanowires dị ọcha nwetara site na anodization otu-ogbo.Nkesa elu nke titanium dioxide nanowires bụ otu, ihe owuwu nke nanowires dị nso na ibe ya, na oke nkesa pore bụ otu.Ọnụọgụ 6b na e bụ micrographs eletrọn nke titanium dioxide ka emechara okpukpu isii na ntinye nke nickel sulfide composites.Site na onyonyo microscopic eletrọn na-ebuli elu 200,000 ugboro na Fig. 6e, enwere ike ịhụ na nickel sulfide composite nanoparticles bụ ihe jikọrọ ọnụ ma nwee nnukwu akụkụ nke ihe dịka 100-120 nm na dayameta.Enwere ike ịhụ ụfọdụ nanoparticles n'ọnọdụ oghere nke nanowires, na titanium dioxide nanowires na-ahụkwa nke ọma.Na fig.6c,f show eletrọn microscopic onyogho nke NiS/TiO2 nanocomposites na AgNO ntinye nke 0.1 M. Tụnyere fig.6b na fig.6e, nkp.6c na fig.6f na-egosi na a na-edobe ihe ndị ahụ Ag nanoparticles n'elu ihe mejupụtara ihe mejupụtara, na-ekesa nanoparticles Ag na-ejikọta ya na dayameta nke ihe dịka 10 nm.Na fig.7 na-egosi akụkụ obe nke Ag / NiS / TiO2 nanofilms doro n'okpuru usoro 6 nke ntinye ntinye nke NiS na ntinye AgNO3 nke 0.1 M. Site na ihe oyiyi dị elu, ihe nkiri a tụrụ atụ bụ 240-270 nm.Ya mere, nickel na ọlaọcha sulfide nanoparticles na-agbakọta n'elu TiO2 nanowires.
TiO2 dị ọcha (a, d), NiS/TiO2 nanocomposites na 6 cycles nke NiS dip deposition (b, e) na Ag / NiS / NiS na 6 cycles nke NiS dip deposition na 0.1 M AgNO3 SEM oyiyi nke TiO2 nanocomposites (c , e).
Cross ngalaba nke Ag/NiS/TiO2 nanofilms edobere na okirikiri 6 nke ntinye ntinye NiS na ntinye AgNO3 nke 0.1 M.
Na fig.8 na-egosi nkesa elu nke ihe ndị dị n'elu Ag / NiS / TiO2 nanocomposites nwetara site na 6 cycles nke nickel sulfide dip deposition na ọlaọcha nitrate nke 0.1 M. Ekesa elu nke ihe na-egosi na Ti, O, Ni, S na Ag hụrụ.na-eji ike spectroscopy.N'ihe gbasara ọdịnaya, Ti na O bụ ihe ndị a na-ahụkarị na nkesa, ebe Ni na S dị ihe dịka otu, mana ọdịnaya ha dị ala karịa Ag.A pụkwara igosi na ọnụ ọgụgụ nke ihe mejupụtara ọlaọcha nanoparticles dị elu karịa nke nickel sulfide.Otu nkesa nke ihe dị n'elu na-egosi na nickel na silver sulfide na-ejikọta ọnụ n'elu TiO2 nanowires.E mekwara nyocha nke fotoelectron spectroscopic X-ray iji nyochaa kpọmkwem ihe mejupụtara yana ọnọdụ njikọ nke ihe.
Nkesa nke ihe (Ti, O, Ni, S, na Ag) nke Ag/NiS/TiO2 nanocomposites na AgNO3 ntinye uche nke 0.1 M maka 6 cycles nke ntinye ntinye NiS.
Na fig.Ọnụọgụ 9 na-egosi ụdị XPS nke Ag / NiS / TiO2 nanocomposites nwetara site na iji usoro 6 nke nickel sulfide deposition site na imikpu na 0.1 M AgNO3, ebe fig.9a bụ ụdị dị iche iche zuru oke, na ihe ndị ọzọ dị n'ụdị dị elu bụ ihe dị elu nke ihe dị iche iche.Dị ka a na-ahụ site na ụdịdị dị iche iche dị na Fig. 9a, a chọtara ọnụ ọgụgụ kasị elu nke Ti, O, Ni, S, na Ag na nanocomposite, nke gosipụtara ịdị adị nke ihe ise a.Nsonaazụ ule a dabere na EDS.Ọnụ ọgụgụ kacha elu dị na foto 9a bụ ọnụ ọgụgụ carbon a na-eji emezi maka ike njikọ nke nlele ahụ.Na fig.9b na-egosi ụdị ike dị elu nke Ti.Ọnụ ọgụgụ kachasị elu nke 2p orbitals dị na 459.32 na 465 eV, nke kwekọrọ na ntinye nke Ti 2p3/2 na Ti 2p1/2 orbitals.Ọnụ elu absorption abụọ na-egosi na titanium nwere Ti4+ valence, nke dabara na Ti na TiO2.
Ụdịdị XPS nke nha Ag/NiS/TiO2 (a) na ụdị XPS dị elu nke Ti2p(b), O1s(c), Ni2p(d), S2p(e), na Ag 3d(f).
Na fig.9d na-egosi ụdị ume ume dị elu nke nwere ọnụ ụzọ mmịpụta anọ maka Ni 2p orbital.Ọnụ ọgụgụ kachasị elu nke mmịpụta na 856 na 873.5 eV kwekọrọ na Ni 2p3/2 na Ni 2p1/2 8.10 orbitals, ebe ọnụ ọgụgụ kasị elu nke nnabata bụ nke NiS.Ọnụ ọgụgụ kachasị elu na 881 na 863 eV bụ maka nickel nitrate ma na-akpata site na nickel nitrate reagent n'oge nkwadebe nlele.Na fig.9e na-egosi ọkwa S-dị elu.Ọnụ ọgụgụ kachasị elu nke S 2p orbitals dị na 161.5 na 168.1 eV, nke kwekọrọ na S 2p3/2 na S 2p1/2 orbitals 21, 22, 23, 24. Ọnụ abụọ a bụ nke nickel sulfide ogige.Ọnụ ọgụgụ kachasị elu na 169.2 na 163.4 eV bụ maka reagent sodium sulfide.Na fig.9f na-egosi a elu-mkpebi Ag ụdịdị dị iche iche nke 3d orbital absorption ọnụ ọgụgụ kasị elu nke ọlaọcha dị na 368.2 na 374.5 eV, karị, na abụọ absorption ọnụ ọgụgụ kwekọrọ ekwekọ absorption orbits nke Ag 3d5/2 na Ag 3d3/212, 13. The akụkụ nke ọlaọcha dị n'ebe abụọ nke ọlaọcha dị adị.Ya mere, nanocomposites bụ tumadi mejupụtara Ag, NiS na TiO2, nke e kpebisiri ike site X-ray photoelectron spectroscopy, nke gosipụtara na nickel na ọlaọcha sulfide nanoparticles e ọma jikọtara n'elu TiO2 nanowires.
Na fig.10 na-egosi UV-VIS ihe nleba anya nhụsianya nke TiO2 nanowires akwadoro ọhụrụ, NiS/TiO2 nanocomposites, na Ag/NiS/TiO2 nanocomposites.Enwere ike ịhụ site na ọnụ ọgụgụ ahụ na ọnụ ụzọ nnabata nke TiO2 nanowires bụ ihe dịka 390 nm, na ọkụ na-etinye uche na-elekwasị anya na mpaghara ultraviolet.Enwere ike ịhụ site na ọnụ ọgụgụ ahụ na mgbe nchikota nke nickel na silver sulfide nanoparticles n'elu titanium dioxide nanowires 21, 22, ìhè na-etinye obi gị dum na-agbasa n'ime mpaghara ìhè a na-ahụ anya.N'otu oge ahụ, nanocomposite amụbawo absorption UV, nke ejikọtara ya na oghere dị warara nke nickel sulfide.Ka ọdịiche nke band ahụ dị warara, na-ebelata ihe mgbochi ike maka ntụgharị eletrọnịkị na ọkwa dị elu nke ojiji ọkụ.Mgbe agbakọchara elu NiS/TiO2 na ọla ọcha nanoparticles, ike nke absorption na ogologo ọkụ amụbaghị nke ọma, ọkachasị n'ihi mmetụta nke resonance plasmon n'elu nanoparticles ọlaọcha.Ogologo ogologo oge nke TiO2 nanowires anaghị eme nke ọma ma e jiri ya tụnyere oghere dị warara nke ihe mejupụtara NiS nanoparticles.Na nchịkọta, mgbe mejupụtara nickel sulfide na ọlaọcha nanoparticles n'elu titanium dioxide nanowires, ya ìhè absorption àgwà na-mma nke ukwuu, na ìhè absorption nso na-agbatị si ultraviolet na ìhè ìhè anya, nke mma itinye n'ọrụ ọnụego nke titanium dioxide nanowires.ìhè nke na-eme ka ikike nke ihe na-emepụta fotoelectrons dịkwuo mma.
UV/Vis na-ekesa ihe nlegharị anya nke TiO2 nanowires ọhụrụ, NiS/TiO2 nanocomposites, na Ag/NiS/TiO2 nanocomposites.
Na fig.11 na-egosi usoro nke photochemical corrosion resistance nke Ag/NiS/TiO2 nanocomposites n'okpuru ìhè irradiation a na-ahụ anya.Dabere na ike nkesa nke nanoparticles ọlaọcha, nickel sulfide, na band conduction nke titanium dioxide, a na-atụpụta maapụ usoro nke nguzogide corrosion.N'ihi na ikike nke nanosilver na-adịghị mma ma e jiri ya tụnyere nickel sulfide, na ikike nke nickel sulfide adịghị mma ma e jiri ya tụnyere titanium dioxide, ntụziaka nke electron eruba bụ Ag→NiS →TiO2→304 igwe anaghị agba nchara.Mgbe ìhè na-enwu n'elu nanocomposite, n'ihi mmetụta nke plasmon resonance nke nanosilver, nanosilver nwere ike ịmepụta oghere foto na electrons ngwa ngwa, na electrons ndị na-emepụta ihe na-esi ngwa ngwa na-esi na valence band ọnọdụ gaa n'ọnọdụ conduction band n'ihi mkpali.Titanium dioxide na nickel sulfide.Ebe ọ bụ na conductivity nke ọlaọcha nanoparticles bụ ihe ọjọọ karịa nke nickel sulfide, electrons na TS nke ọlaọcha nanoparticles na-ngwa ngwa converted TS nke nickel sulfide.Ntughari ikike nke nickel sulfide dị njọ karịa nke titanium dioxide, ya mere electrons nke nickel sulfide na conductivity nke ọlaọcha na-agbakọta ngwa ngwa na CB nke titanium dioxide.Eletrọn ndị a na-emepụta foto na-emepụta na-eru n'elu 304 igwe anaghị agba nchara site na titanium matrix, na electrons bara ụba na-ekere òkè na usoro mbelata oxygen nke cathodic nke 304 igwe anaghị agba nchara.Usoro a na-ebelata mmeghachi omume nke cathodic ma n'otu oge ahụ na-egbochi mmeghachi omume nke anodic dissolution nke 304 igwe anaghị agba nchara, si otú ahụ na-aghọta na cathodic nchebe nke igwe anaghị agba nchara 304. N'ihi na e guzobere eletriki nke heterojunction na Ag / NiS / TiO2 nanocomposite, conductive ikike nke nanocomposite nke nanocomposite na-eme ka ọ dịkwuo irè nke nanocomposite. 04 igwe anaghị agba nchara.
Eserese eserese nke fotoelectrochemical mgbochi corrosion nke Ag/NiS/TiO2 nanocomposites na ìhè a na-ahụ anya.
N'ime ọrụ a, a na-emepụta nickel na silver sulfide nanoparticles n'elu TiO2 nanowires site na nmikpu dị mfe na usoro photoreduction.A na-eme usoro ọmụmụ banyere nchebe cathodic nke Ag / NiS / TiO2 nanocomposites na 304 igwe anaghị agba nchara.Dabere na njirimara morphological, nyocha nke ihe mejupụtara na nyocha nke njirimara absorption nke ìhè, e mere nkwubi okwu ndị a:
Na ọnụ ọgụgụ nke impregnation-deposition cycles nke nickel sulfide nke 6 na ịta nke silver nitrate maka photoreduction nke 0.1 mol / l, na-akpata Ag / NiS / TiO2 nanocomposites nwere mma cathodic nchebe mmetụta na 304 igwe anaghị agba nchara.E jiri ya tụnyere calomel electrode jupụtara, ikike nchebe ruru -925 mV, na nchebe ugbu a ruru 410 μA / cm2.
A na-emepụta oghere eletrik heterojunction na Ag/NiS/TiO2 nanocomposite interface, nke na-eme ka ike nkewa nke electrons na oghere ndị a na-emepụta na-eme ka mma.N'otu oge ahụ, a na-abawanye arụmọrụ nke ọkụ ọkụ na ọkụ ọkụ na-agbatị site na mpaghara ultraviolet gaa na mpaghara a na-ahụ anya.Nanocomposite ka ga-ejigide ọnọdụ izizi ya na nkwụsi ike dị mma mgbe okirikiri 4 gachara.
Ag/NiS/TiO2 nanocomposites akwadobere nnwale nwere otu akwa na elu.Nickel sulfide na ọlaọcha nanoparticles na-uniformed compounded n'elu TiO2 nanowires.Ngwakọta cobalt ferrite na ọlaọcha nanoparticles dị oke ọcha.
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Oge nzipu: Sep-14-2022