Evaluating Non-Platinum Group Catalysts for Decoupled Water Splitting in Bicarbonate Buffer

Pinho, Luís and Potter, Mark and Toghill, Kathryn (2025) Evaluating Non-Platinum Group Catalysts for Decoupled Water Splitting in Bicarbonate Buffer. In: UNSPECIFIED.

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Abstract

Electrochemical water splitting is crucial for the decarbonization of industrial processes and the coupling of renewable energy sources. Conventional H2O electrolyzers generate H2 and O2 in neighbouring compartments using critical raw materials (CRMs) as catalysts and corrosive electrolytes, which raises issues (cost and safety). We use redox mediators as electrical charge and potential vectors to separate catalytic product formation from the electrode surface. We report the successful application of decoupled electrolysis in near neutral pH using bicarbonate buffer. MoS2 gives the highest faradaic yield of all electrocatalysts. We evaluate the kinetics and thermodynamics of the decoupled HER