Durable photoelectrochemical CO2 reduction with water oxidation using a visible-light driven molecular photocathode

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 pol...

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Bibliographic Details
Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 9; no. 3; pp. 1517 - 1529
Main Authors Kamata, Ryutaro, Kumagai, Hiromu, Yamazaki, Yasuomi, Higashi, Masanobu, Ryu, Abe, Ishitani, Osamu
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2021
Subjects
Bias
Carbon dioxide
Catalysts
Cobalt oxides
Durability
Energy
Energy conversion
Energy conversion efficiency
Energy sources
Infrared spectroscopy
Irradiation
Light irradiation
Nickel oxides
Oxidation
Photocatalysis
Photocathodes
Photoelectric effect
Photoelectric emission
Photosynthesis
Reducing agents
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Summary: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.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta07351b