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Front-Surface Potential of Platinized p‑InP Photocathodes Probed by Dual-Working-Electrode Measurements
Weilai Yu1,2, Nathan S Lewis1,3
1Division of Chemistry and Chemical Engineering, 127-72 Noyes Laboratory, California Institute of Technology, Pasadena, California 91125, United States.
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).
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