Issue 3, 2023

Efficient photoelectrochemical Kolbe C–C coupling at BiVO4 electrodes under visible light irradiation

Abstract

Electrochemical Kolbe C–C coupling of carboxylic acids at Pt electrodes has been studied for over 150 years and remains relevant today because renewable electricity is envisaged to make an increasing contribution to clean chemical processes and carboxylic acids are readily available precursors for chemical synthesis. Traditional electrochemical Kolbe occurs typically at very high potential (>10 V) which is required to achieve high selectivity for C–C coupling. Here we describe porous BiVO4 photoelectrodes that mediate C–C Kolbe coupling with near quantitative faradaic efficiency under visible light irradiation at <2 V. High substrate concentrations are also found to stabilise the double layer avoiding the need for additional supporting electrolyte. Comparison with related literature describing photocatalytic Kolbe C–C coupling shows that the apparent quantum yield can be raised from <1% to 12% demonstrating the distinct advantage of using photoelectrochemistry in this system.

Graphical abstract: Efficient photoelectrochemical Kolbe C–C coupling at BiVO4 electrodes under visible light irradiation

Supplementary files

Article information

Article type
Paper
Submitted
22 nov. 2022
Accepted
12 ene. 2023
First published
16 ene. 2023
This article is Open Access
Creative Commons BY-NC license

Green Chem., 2023,25, 1067-1077

Efficient photoelectrochemical Kolbe C–C coupling at BiVO4 electrodes under visible light irradiation

W. A. Swansborough-Aston, A. Soltan, B. Coulson, A. Pratt, V. Chechik and R. E. Douthwaite, Green Chem., 2023, 25, 1067 DOI: 10.1039/D2GC04423D

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