Durable photoelectrochemical CO2reduction with water oxidation using a visible-light driven molecular photocathode

Ryutaro Kamata, Hiromu Kumagai, Yasuomi Yamazaki, Masanobu Higashi, Ryu Abe, Osamu Ishitani

Research output: Contribution to journalArticlepeer-review


Photocatalytic reduction of CO2 using water as a reductant and visible light as the energy source is an important target in artificial photosynthesis. In this study, we report a highly stable photoelectrochemical CO2 reduction involving a new molecular photocathode comprising a NiO electrode and polymerized complexes of the Ru(ii) photosensitizer and Ru(ii) catalyst (NiO/PRu-poly-Ru-RuCAT1). CO and HCOOH were stably and selectively produced for over 100 h under visible light irradiation and a low bias. The turnover number of CO2 reduction products exceeded 1200, which represents the highest durability reported for photoelectrochemical reactions using molecular photocathodes. Moreover, a connected system of the NiO/PRu-poly-Ru-RuCAT1 molecular photocathode and a CoOx/BiVO4 photoanode suitable for water oxidation facilitated stable CO2 reduction with water as an electron donor and visible light as the energy source, with no bias for over 24 h. An energy conversion efficiency of 1.7 × 10-2% was obtained, which is the highest value reported for visible light driven systems utilizing a molecular photocatalyst for CO2 reduction with water as the reductant. This journal is

Original languageEnglish
Pages (from-to)1517-1529
Number of pages13
JournalJournal of Materials Chemistry A
Issue number3
Publication statusPublished - 2021 Jan 21
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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