Electrochemical Stability of p-GaInP2 in Aqueous Electrolytes Toward Photoelectrochemical Water Splitting

Oscar Khaselev, Jhon A. Turner

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93 Scopus Citations

Abstract

With an eye toward developing a photoelectrochemical system for water splitting using p-GaInP2, the electrochemical stability of p-GaInP2, was studied in 10 M KOH, 3 M H2SO4, and a phosphate buffer of pH 7. It was found that in the dark, the p-GaInP2 electrode is susceptible to corrosion in all investigated solutions. Upon illumination, the anodic corrosion current increases. Under cathodic polarization in 10 M KOH, the p-GaInP2 electrode shows saturated photocurrent density, however the photocurrent slowly decreases with time due to the precipitation of an indium-enriched oxide. In 3 M H2SO4, the anodic process can be inhibited under relatively low cathodic potentials, and stable photocurrnents can be obtained. In neutral solution, p-GaInP2 is coverd by a semi-insulating oxide film and the observed photocurrent densities are much lower than those in 10 M KOH and 3 M H2SO4.

Original languageAmerican English
Pages (from-to)3335-3339
Number of pages5
JournalJournal of the Electrochemical Society
Volume145
Issue number10
DOIs
StatePublished - 1998

NREL Publication Number

  • NREL/JA-590-23983

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