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.
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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 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10073811 |
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