Photoelectrochemical H2 generation from water using a CoO x /GaN photoelectrode

Martin Velazquez-Rizo, Daisuke Iida, Kazuhiro Ohkawa

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3 Scopus citations


We report the fabrication of a GaN-based photoelectrode with CoO x as a cocatalyst for the photoelectrochemical H2 generation from water. We confirmed that the cocatalyst prevented the GaN photocorrosion partially during the water photoelectrolysis reaction and that it has a superior performance when it is deposited as particles instead of as a thin film. We demonstrated that the CoO x /GaN photoelectrode is capable of generating H2 at a quasi-stable rate for at least 20 h. Scanning and transmission electron microscopy analyses of the cocatalyst confirmed that the CoO x particles agglomerate in sparse polycrystalline clusters, which were formed mainly by spinel Co3O4.
Original languageEnglish (US)
Pages (from-to)SCCC23
JournalJapanese Journal of Applied Physics
Issue numberSC
StatePublished - May 20 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): BAS/1/1676-01-01, BAS/1/1676-01-08
Acknowledgements: This work was supported by the King Abdullah University of Science and Technology (KAUST) baseline funding BAS/1/
1676-01-01 and start-up funding BAS/1/1676-01-08.


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