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

William A. Swansborough-Aston, Ayman Soltan, Ben Coulson, Andrew Pratt, Victor Chechik*, Richard E. Douthwaite

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1067-1077
Number of pages11
JournalGreen Chemistry
Publication statusPublished - 16 Jan 2023

Bibliographical note

Funding Information:
The authors thank the EPSRC (EP/N509802/1), the British Council Newton-Mosharafa Fund (A. S.) and University of York for financial support.

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

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