Analysis of Products from Photoelectrochemical Reduction of 13CO2 by GaN-Si Based Tandem Photoelectrode

Takeyuki Sekimoto; Hiroshi Hashiba; Shuichi Shinagawa; Yusuke Uetake; Masahiro Deguchi; Satoshi Yotsuhashi; Kazuhiro Ohkawa

doi:10.1021/acs.jpcc.6b03840

Analysis of Products from Photoelectrochemical Reduction of ¹³CO₂ by GaN-Si Based Tandem Photoelectrode

Takeyuki Sekimoto^*, Hiroshi Hashiba, Shuichi Shinagawa, Yusuke Uetake, Masahiro Deguchi, Satoshi Yotsuhashi, Kazuhiro Ohkawa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Gallium nitride (GaN) has been shown to be a good photocatalyst for not only water splitting but also carbon dioxide (CO₂) reduction. To verify the catalytic reaction involved in CO₂ reduction, it is essential to confirm that the reaction products only come from dissolved CO₂. Here, we report the results of ¹³CO₂-labeling experiments on a GaN-Si based photoelectrochemical system for each reduction product. It was found that the ¹³C-based CO₂ was almost completely converted to formic acid (HCOOH), methane, and ethylene when KCl was used as the electrolyte. In contrast, HCOOH from ¹²C was observed when KHCO₃ electrolyte was used, meaning that HCO₃^- in the electrolyte partly contributed to CO₂ reduction. The energy conversion efficiency and Faradaic efficiency of the respective reduction processes in the present system are also discussed.

Original language	English (US)
Pages (from-to)	13970-13975
Number of pages	6
Journal	JOURNAL OF PHYSICAL CHEMISTRY C
Volume	120
Issue number	26
DOIs	https://doi.org/10.1021/acs.jpcc.6b03840
State	Published - Jul 7 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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

Access to Document

10.1021/acs.jpcc.6b03840

Cite this

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abstract = "Gallium nitride (GaN) has been shown to be a good photocatalyst for not only water splitting but also carbon dioxide (CO2) reduction. To verify the catalytic reaction involved in CO2 reduction, it is essential to confirm that the reaction products only come from dissolved CO2. Here, we report the results of 13CO2-labeling experiments on a GaN-Si based photoelectrochemical system for each reduction product. It was found that the 13C-based CO2 was almost completely converted to formic acid (HCOOH), methane, and ethylene when KCl was used as the electrolyte. In contrast, HCOOH from 12C was observed when KHCO3 electrolyte was used, meaning that HCO3- in the electrolyte partly contributed to CO2 reduction. The energy conversion efficiency and Faradaic efficiency of the respective reduction processes in the present system are also discussed.",

author = "Takeyuki Sekimoto and Hiroshi Hashiba and Shuichi Shinagawa and Yusuke Uetake and Masahiro Deguchi and Satoshi Yotsuhashi and Kazuhiro Ohkawa",

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T1 - Analysis of Products from Photoelectrochemical Reduction of 13CO2 by GaN-Si Based Tandem Photoelectrode

AU - Sekimoto, Takeyuki

AU - Hashiba, Hiroshi

AU - Shinagawa, Shuichi

AU - Uetake, Yusuke

AU - Deguchi, Masahiro

AU - Yotsuhashi, Satoshi

AU - Ohkawa, Kazuhiro

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AB - Gallium nitride (GaN) has been shown to be a good photocatalyst for not only water splitting but also carbon dioxide (CO2) reduction. To verify the catalytic reaction involved in CO2 reduction, it is essential to confirm that the reaction products only come from dissolved CO2. Here, we report the results of 13CO2-labeling experiments on a GaN-Si based photoelectrochemical system for each reduction product. It was found that the 13C-based CO2 was almost completely converted to formic acid (HCOOH), methane, and ethylene when KCl was used as the electrolyte. In contrast, HCOOH from 12C was observed when KHCO3 electrolyte was used, meaning that HCO3- in the electrolyte partly contributed to CO2 reduction. The energy conversion efficiency and Faradaic efficiency of the respective reduction processes in the present system are also discussed.

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