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InGaN/GaN Multiple Quantum Well Photoanode Modified with Cobalt Oxide for Water Oxidation

Alqahtani, M; Sathasivam, S; Alhassan, A; Cui, F; Benjaber, S; Blackman, C; Zhang, B; ... Wu, J; + view all (2018) InGaN/GaN Multiple Quantum Well Photoanode Modified with Cobalt Oxide for Water Oxidation. ACS Applied Energy Materials , 1 (11) pp. 6417-6424. 10.1021/acsaem.8b01387. Green open access

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Abstract

Indium gallium nitride (InGaN) is an attractive semiconductor, with a tunable direct bandgap for photoelectrochemical water splitting, but it corrodes in aqueous electrolytes. Cobalt oxide (CoOx) is a promising cocatalyst to protect photoelectrodes and accelerate the charge transfer. CoOx is earth-abundant and stable in extremely alkaline conditions and shows high activity for the oxygen evolution reaction (OER). In this work, we demonstrate that CoOx directly deposited onto InGaN/GaN multiple quantum well photoanodes exhibits excellent activity and stability in a strong alkaline electrolyte, 1 M NaOH (pH = 13.7), for water oxidation up to 28 h, while a reference sample without the catalyst degraded rapidly in the alkaline electrolyte. Under simulated solar illumination, the CoOx-modified InGaN/GaN quantum well photoanode showed a high photocurrent density of 1.26 mA cm–2 at 1.23 V and an onset potential of −0.03 V versus a reversible hydrogen electrode.

Type: Article
Title: InGaN/GaN Multiple Quantum Well Photoanode Modified with Cobalt Oxide for Water Oxidation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acsaem.8b01387
Publisher version: https://doi.org/10.1021/acsaem.8b01387
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: indium gallium nitrides; quantum wells; photoelectrochemical water splitting; photoanodes; cobalt oxides
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
URI: https://discovery.ucl.ac.uk/id/eprint/10073811
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