Publication date: 21st July 2025
Bismuth vanadate (BiVO4) is a promising photoactive material for oxidation reactions but is unstable in strongly acidic conditions, which remains a significant challenge, [1][2] particularly for applications like the glycerol oxidation reaction (GOR), [3] which has recently received high interest, since glycerol is a byproduct from the biodiesel industry and can be converted into high-value chemicals through selective oxidation and with a rather low energy input.
In this context, achieving stable photoanode performance at low pH conditions, is crucial for efficient and selective conversion of glycerol into high added-value products, like dihydroxyacetone (DHA), [4][5]. This communication will address our strategy to enhance the stability of BVO photoanodes in acidic solutions, by the deposition of nanometric layers of metal oxides (TiO2, and Al2O3) through atomic layer deposition (ALD). Notably, BVO photoanodes modified with these protection layers demonstrate significantly improved stability, with negliglible loss of performance during at least 12 hours. This research demonstrates a viable strategy for improving the stability of BVO photoanodes in acidic environments, paving the way for more robust and efficient photoelectrochemical glycerol valorization.
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