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

doi:10.1039/d0ta07351b

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 journal › Article › peer-review

23 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	1517-1529
Number of pages	13
Journal	Journal of Materials Chemistry A
Volume	9
Issue number	3
DOIs	https://doi.org/10.1039/d0ta07351b
Publication status	Published - 2021 Jan 21
Externally published	Yes

ASJC Scopus subject areas

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1039/d0ta07351b

Cite this

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title = "Durable photoelectrochemical CO2reduction with water oxidation using a visible-light driven molecular photocathode",

abstract = "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 ",

author = "Ryutaro Kamata and Hiromu Kumagai and Yasuomi Yamazaki and Masanobu Higashi and Ryu Abe and Osamu Ishitani",

note = "Funding Information: This work was supported by JST CREST Grant number JPMJCR13L1 in “Molecular Technology,” JST Strategic International Collaborative Research Program (PhotoCAT), and JSPS KAKENHI Grant number JP17H06440 in Scientic Research on Innovative Areas “Innovations for Light-Energy Conversion.” H. K. acknowledges JSPS KAKENHI Grant number JP16K21031 for Young Scientists (B). We thank Ookayama Materials Analysis Division, Technical Department from Tokyo Institute of Technology for the SEM measurement and TOF-SIMS measurement. Publisher Copyright: {\textcopyright} The Royal Society of Chemistry.",

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AU - Kamata, Ryutaro

AU - Kumagai, Hiromu

AU - Yamazaki, Yasuomi

AU - Higashi, Masanobu

AU - Abe, Ryu

AU - Ishitani, Osamu

N1 - Funding Information: This work was supported by JST CREST Grant number JPMJCR13L1 in “Molecular Technology,” JST Strategic International Collaborative Research Program (PhotoCAT), and JSPS KAKENHI Grant number JP17H06440 in Scientic Research on Innovative Areas “Innovations for Light-Energy Conversion.” H. K. acknowledges JSPS KAKENHI Grant number JP16K21031 for Young Scientists (B). We thank Ookayama Materials Analysis Division, Technical Department from Tokyo Institute of Technology for the SEM measurement and TOF-SIMS measurement. Publisher Copyright: © The Royal Society of Chemistry.

PY - 2021/1/21

Y1 - 2021/1/21

N2 - 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

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