Effects of Anionic Polymer Modification of Dye‐Sensitized Niobate Photocatalysts on Solar‐Driven Z‐Scheme Overall Water Splitting
- Department of Chemistry School of Science Tokyo Institute of Technology Ookayama Tokyo 152-8550 Japan
- Department of Chemistry University of Pennsylvania Philadelphia PA 19104 USA
- Global Zero Emission Research Center (GZR) National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8569 Japan
- Department of Chemistry University of Pennsylvania Philadelphia PA 19104 USA, International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) Tsukuba Ibaraki 305-0044 Japan
- Department of Chemistry School of Science Tokyo Institute of Technology Ookayama Tokyo 152-8550 Japan, Living Systems Materialogy (LiSM) Research Group International Research Frontiers Initiative (IRFI) Tokyo Institute of Technology Yokohama Kanagawa 226-8502 Japan
Pt‐intercalated calcium niobate nanosheets (Pt/HCa 2 Nb 3 O 10 ) sensitized by a Ru(II) complex dye are good photocatalysts for producing H 2 from aqueous solutions containing I − as a reversible electron donor. These materials are applicable to Z‐scheme overall water splitting in combination with a WO 3 ‐based O 2 ‐evolving photocatalyst under simulated sunlight. In this work, the effects of anionic polymer modification of the dye‐sensitized nanosheets are examined by adsorbing sodium poly(styrenesulfonate) (PSS), sodium polyacrylate, sodium polymethacrylate (PMA), or sodium poly(4‐styrenesulfonic‐ co ‐maleic acid) onto the dye‐sensitized nanosheet surface. For half‐cell H 2 ‐evolution reaction in the presence of NaI, all of the polymers have a positive impact on the activity under visible light at lower light intensity, whereas only PMA is effective under high light‐intensity condition. For Z‐scheme overall water splitting with PtO x /H‐Cs‐WO 3 , PSS and PMA give almost the same solar‐to‐hydrogen energy conversion efficiencies (0.12% ± 0.01%) under optimized conditions. However, PMA operates better than PSS at relatively low and high NaI concentrations, which are in general disadvantageous for the H 2 ‐ and O 2 ‐evolving components of the Z‐scheme, respectively.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 2007972
- Alternate ID(s):
- OSTI ID: 2007975
- Journal Information:
- Solar RRL, Journal Name: Solar RRL Vol. 7 Journal Issue: 23; ISSN 2367-198X
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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