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Potencial de la Superficie Frontal de Fotocátodos de p‑InP Platinizados Sometido a Prueba Mediante Mediciones de

Weilai Yu^1,2, Nathan S Lewis^1,3

¹Division of Chemistry and Chemical Engineering, 127-72 Noyes Laboratory, California Institute of Technology, Pasadena, California 91125, United States.

ACS energy letters

|February 19, 2026

Abstract:

The front-surface potential (E _fr) of p-InP/Pt photocathodes performing the hydrogen-evolution reaction has been probed under operating conditions using a dual-working-electrode (DWE) method. The DWE data are consistent with expectations for proposed stability mechanisms for p-InP photocathodes. Specifically, E _fr for Pt-modified p-InP adopts a value near the reversible hydrogen electrode (RHE) potential, consistent with kinetic suppression of metallic In⁰ formation. The data provide a rapid, operando metric of interfacial catalyst activity, and indicate that E _fr for the p-InP/Pt junction is governed by surface catalytic kinetics rather than by the applied back-contact potential (E _b).

Palabras clave:

fotocatálisis interfaz semiconductora reacción de evolución de hidrógeno fotocátodos potencial de superficie cinética catalítica

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