Photoelectrochemical Decomposition of Water Using Modified Monolithic Tandem Cells

Xiaoping Gao, Shyam Kocha, Arthur J. Frank, John A. Turner

Research output: Contribution to journalArticlepeer-review

35 Scopus Citations


Photovoltaic tandem cells, consisting of a gallium indium phosphide (GaInP2) homojunction grown epitaxially on a gallium arsenide (GaAs) homojunction with a GaAs tunnel diode interconnect, were modified with an additional top p-layer of GalnP2. These cells were used as electrodes to photoelectrochemically decompose water into hydrogen and oxygen in 1 M, 5 M and 11 M KOH electrolyte solutions. The hydrogen reaction was catalyzed at the semiconductor surface with a photoelectrochemically deposited thin layer of platinum and ruthenium. Gas chromatography and electrochemical experiments demonstrate that the modified tandem cells produce hydrogen and oxygen with a light-to-hydrogen conversion efficiency of up to 6%. Both the efficiency and the stability of these cells are discussed.

Original languageAmerican English
Pages (from-to)319-325
Number of pages7
JournalInternational Journal of Hydrogen Energy
Issue number4
StatePublished - 1999

NREL Publication Number

  • NREL/JA-590-24212


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