Issue 10, 2021

An efficient, formic acid selective CO2 electrolyzer with a boron-doped diamond cathode

Abstract

We fabricated a CO2 electrolyzer in order to investigate the energy requirements and the electrical-to-chemical energy conversion efficiency obtained when using boron-doped diamond as the cathode. The main product in the electrochemical reduction of CO2 using a boron-doped diamond electrode is formic acid, with a faradaic efficiency of 96%. The electrical-to-chemical energy conversion efficiency was investigated at various bias voltages, and it reached 43%, very close to the predicted maximum value, at a cell voltage of 3 V. If the secondary products, hydrogen and carbon monoxide, are also considered, the total electrical-to-chemical energy conversion efficiency was as much as 45%.

Graphical abstract: An efficient, formic acid selective CO2 electrolyzer with a boron-doped diamond cathode

Supplementary files

Article information

Article type
Paper
Submitted
03 Mar 2021
Accepted
04 Apr 2021
First published
05 Apr 2021

Sustainable Energy Fuels, 2021,5, 2590-2594

An efficient, formic acid selective CO2 electrolyzer with a boron-doped diamond cathode

J. Du, A. Fiorani and Y. Einaga, Sustainable Energy Fuels, 2021, 5, 2590 DOI: 10.1039/D1SE00309G

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