Photocatalyst Z-scheme system composed of a linear conjugated polymer and BiVO4 for overall water splitting under visible light

Yang Bai, Keita Nakagawa, Alexander J. Cowan, Catherine M. Aitchison, Yuichi Yamaguchi, Martijn A. Zwijnenburg, Akihiko Kudo, Reiner Sebastian Sprick, Andrew I. Cooper

Research output: Contribution to journalArticle

Abstract

Linear conjugated polymers have potential as photocatalysts for hydrogen production from water but so far, most studies have involved non-scalable sacrificial reagents. Z-schemes comprising more than one semiconductor are a potential solution, but it is challenging to design these systems because multiple components must work together synergistically. Here, we show that a conjugated polymer photocatalyst for proton reduction can be coupled in a Z-scheme with an inorganic water oxidation photocatalyst to promote overall water splitting without any sacrificial reagents. First, a promising combination of an organic catalyst, an inorganic catalyst, and a redox mediator was identified by using high-throughput screening of a library of components. A Z-scheme system composed of P10 (homopolymer of dibenzo[b,d]thiophene sulfone)–Fe2+/Fe3+–BiVO4 was then constructed for overall water splitting under visible light irradiation. Transient absorption spectroscopy was used to assign timescales to the various steps in the photocatalytic process. While the overall solar-to-hydrogen efficiency of this first example is low, it provides proof of concept for other hybrid organic–inorganic Z-scheme architectures in the future.
Original languageEnglish
Pages (from-to)16283-16290
Number of pages8
JournalJournal of Materials Chemistry. A
Volume8
Issue number32
Early online date22 Jul 2020
DOIs
Publication statusPublished - 28 Aug 2020

Keywords

  • linear conjugated polymers
  • photocatalysts
  • hydrogen production

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