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Visible‐light‐driven nonsacrificial hydrogen evolution by modified carbon nitride photocatalysts

Chinese Journal of Catalysis 2022年第9期43卷 2316-2320页

作者： Shunta Nishioka Kengo Shibata Yugo Miseki kazuhiro sayama Kazuhiko Maeda Department of Chemistry School of ScienceTokyo Institute of Technology2‐12‐1‐NE‐2 OokayamaMeguro‐kuTokyo 152‐8550Japan Global Zero Emission Research Center(GZR) National Institute of Advanced Industrial Science and Technology(AIST)West16‐1OnogawaTsukubaIbaraki 305‐8569Japan

Pt‐loaded graphitic carbon nitride(g‐C_(3)N_(4))is known to be a good photocatalyst for H_(2) evolution under visible *** most cases,however,sacrificial electron donors such as triethanolamine are required for the water‐splitting operation,and nonsacrificial H_(2) evolution by g‐C_(3)N_(4) remains a *** this work,we investigated the photocatalytic activities of carbon nitride nanosheet(NS‐C_(3)N_(4)),which was prepared by thermal treatment of urea,for nonsacrificial H_(2) evolution using reversible electron donors under visible light(λ>400 nm).Whereas Pt‐loaded NS‐C_(3)N_(4) did not produce H_(2) from aqueous solutions containing I−,Fe^(2+),or[Fe(CN)_(6)]^(4−),modification of the Pt/NS‐C_(3)N_(4) photocatalyst with CrO_(x) led to observable H_(2) *** electron microscopy observations and energy‐dispersive X‐ray spectroscopic analysis suggested that a Pt‐core/CrO_(x)‐shell structure was formed on the NS‐C_(3)N_(4).The CrO_(x)/Pt/NS‐C_(3)N_(4) served as a H_(2)‐evolution photocatalyst for visible‐light‐driven Z‐scheme overall water splitting,in combination with a modified WO_(3) photocatalyst,in the presence of a[Fe(CN)_(6)]^(3−/4−)redox mediator.

关键词： Artificial photosynthesis Solar fuels Water splitting

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Is platinum-loaded titania the best material for dye-sensitized hydrogen evolution under visible light?

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Chinese Journal of Catalysis 2024年第8期63卷 124-132页

作者： Haruka Yamamoto Langqiu Xiao Yugo Miseki Hiroto Ueki Megumi Okazaki kazuhiro sayama Thomas E.Mallouk Kazuhiko Maeda Department of Chemistry School of ScienceTokyo Institute of Technology2-12-1-NE-2 OokayamaMeguro-kuTokyo 152-8550Japan Department of Chemistry University of Pennsylvania231 S.34th Street PhiladelphiaPA 19104United States Global Zero Emission Research Center(GZR) National Institute of Advanced Industrial Science and Technology(AIST)West16-1OnogawaTsukubaIbaraki 305-8569Japan International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)TsukubaIbaraki 305-0044Japan Research Center for Autonomous Systems Materialogy(ASMat) Tokyo Institute of Technology4259 Nagatsuta-choMidori-kuYokohamaKanagawa 226-8501Japan

A dye-sensitized photocatalyst combining Pt-loaded TiO_(2) and Ru(Ⅱ)tris-diimine sensitizer(RuP)was constructed and its activity for photochemical hydrogen evolution was compared with that of Pt-intercalated HCa_(2)Nb_(3)O_(10) *** the sacrificial donor ethylenediaminetetraacetic acid(EDTA)disodium salt dihydrate was used,RuP/Pt/TiO_(2) showed higher activity than RuP/Pt/HCa_(2)Nb_(3)O_(10).In contrast,when NaI(a reversible electron donor)was used,RuP/Pt/TiO_(2) showed little activity due to back electron transfer to the electron acceptor(I_(3)-),which was gener-ated as the oxidation product of I-.By modification with anionic polymers(sodium poly(styrenesulfonate)or sodium polymethacrylate)that could inhibit the scavenging of conduction band electrons by I_(3)-,the H_(2) production activity from aqueous NaI was improved,but it did not exceed that of RuP/Pt/HCa_(2)Nb_(3)O_(10).Transient absorption measurements showed that the rate of semiconductor-to-dye back electron transfer was slower in the case of TiO_(2) than HCa_(2)Nb_(3)O_(10),but the electron transfer reaction to I3-was much *** results indicate that Pt/TiO_(2) is useful for reactions with sacrificial reductants(e.g.,EDTA),where the back electron transfer reaction to the more reducible product can be ***,more careful design of the catalyst will be nec-essary when a reversible electron donor is employed.

关键词： Artificial photosynthesis Solar fuel Water splitting Z-scheme

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