Photo-assisted electrochemical CO2 reduction at a boron-doped diamond cathode

Goki Iwai; Andrea Fiorani; Jinglun Du; Yasuaki Einaga

doi:10.1039/D3YA00054K

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Photo-assisted electrochemical CO₂ reduction at a boron-doped diamond cathode†

Goki Iwai,

^a Andrea Fiorani,

*^a Jinglun Du

^a and Yasuaki Einaga

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Keio University, Yokohama 223-8522, Japan
E-mail: andrea.fiorani@keio.jp, einaga@chem.keio.ac.jp

Abstract

We report on the coupling of photoelectrochemical water oxidation and electrochemical CO₂ reduction to formic acid for a photoelectrochemical system capable of light and electrochemical energy conversion to chemical energy. Titanium oxide nanotubes (TiO₂ NT) and boron-doped diamond (BDD) electrodes were used as a photoanode and a cathode, respectively. From CO₂ electrochemical reduction at BDD, formic acid was obtained with a faradaic efficiency of about 86% and the system provided an overall energy conversion efficiency of 5.5%. From previous CO₂ reduction at a dark electrolyzer based on a BDD cathode, the cell voltage was reduced from 2.7 V to 1.4 V with 52% saving of the electrical energy input. This resulted in an increase from 50% to nearly 80% of electrical-to-chemical energy conversion efficiency.

This article is part of the themed collection: Energy Advances: Highlight Japan & South Korea

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Article information

DOI: https://doi.org/10.1039/D3YA00054K
Article type: Paper
Submitted: 31 Jan 2023
Accepted: 06 Apr 2023
First published: 07 Apr 2023
This article is Open Access

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Energy Adv., 2023,2, 733-738

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Photo-assisted electrochemical CO₂ reduction at a boron-doped diamond cathode

G. Iwai, A. Fiorani, J. Du and Y. Einaga, Energy Adv., 2023, 2, 733 DOI: 10.1039/D3YA00054K

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