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

Martin Velazquez-Rizo; Daisuke Iida; Kazuhiro Ohkawa

doi:10.7567/1347-4065/ab0f1d

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

Martin Velazquez-Rizo, Daisuke Iida, Kazuhiro Ohkawa

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	SCCC23
Journal	Japanese Journal of Applied Physics
Volume	58
Issue number	SC
DOIs	https://doi.org/10.7567/1347-4065/ab0f1d
State	Published - 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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https://repository.kaust.edu.sa/bitstream/10754/656750/1/CoOx_manuscript.docx

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title = "Photoelectrochemical H2 generation from water using a CoO x /GaN photoelectrode",

abstract = "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.",

author = "Martin Velazquez-Rizo and Daisuke Iida and Kazuhiro Ohkawa",

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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doi = "10.7567/1347-4065/ab0f1d",

language = "English (US)",

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T1 - Photoelectrochemical H2 generation from water using a CoO x /GaN photoelectrode

AU - Velazquez-Rizo, Martin

AU - Iida, Daisuke

AU - Ohkawa, Kazuhiro

N1 - 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.

PY - 2019/5/20

Y1 - 2019/5/20

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10754/656750

UR - https://iopscience.iop.org/article/10.7567/1347-4065/ab0f1d

UR - http://www.scopus.com/inward/record.url?scp=85070748103&partnerID=8YFLogxK

U2 - 10.7567/1347-4065/ab0f1d

DO - 10.7567/1347-4065/ab0f1d

M3 - Article

SN - 0021-4922

VL - 58

SP - SCCC23

JO - Japanese Journal of Applied Physics

JF - Japanese Journal of Applied Physics

IS - SC

ER -

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

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