LE QUY DON
Technical University
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Enhancing photoelectrocatalytic activity and stability of p-Cu2O photocathode through n-TiO2 coating for improved H2 evolution reaction

Le, H.V. and Ung, T.T.D. and Tran, P.D. and Mai, H.V. and Do, B.D. and Nguyen, L.Q. (2023) Enhancing photoelectrocatalytic activity and stability of p-Cu2O photocathode through n-TiO2 coating for improved H2 evolution reaction. Journal of Physics D: Applied Physics, 56 (46): 465502. ISSN 00223727

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Abstract

This article presents a novel approach to improve both the photoelectrocatalytic activity and stability of the p-Cu2O photocathode. The approach involves the coating of an n-type TiO2 layer using e-beam evaporation with precise controllability of the coating thickness onto the p-type Cu2O electrode, forming a TiO2/Cu2O p/n heterojunction. Such a p/n junction enhances the photoelectrocatalytic activity of the Cu2O electrode by promoting the separation of the photo-generated charge carriers. Additionally, the large bandgap TiO2 coating layer serves as protection, reducing the photocorrosion of Cu2O, thereby improving the stability of the electrode. The n-TiO2/p-Cu2O photocathode shows superior photoelectrochemical H2 evolution activity in comparison to the pristine p-Cu2O photocathode. We have found that the thickness and annealing temperature of TiO2 influence strongly the photocurrent and stability of the resultant TiO2/Cu2O photocathode. The best TiO2/Cu2O photocathode was achieved by coating a 50 nm thick TiO2 layer onto the Cu2O, followed by annealing at 350 °C. This configuration exhibited a large onset photovoltage of 0.58 V vs RHE and a catalytic current density of ∼0.9 mA·cm-2 at 0 V vs RHE in a pH 7 phosphate buffer, under standard 1 Sunlight illumination. © 2023 IOP Publishing Ltd.

Item Type: Article
Divisions: Faculties > Faculty of Special Equipments
Identification Number: 10.1088/1361-6463/acefe1
Uncontrolled Keywords: Coatings; Copper oxides; Heterojunctions; Hydrogen; Image enhancement; Photocathodes; Solar power generation; Stability; Thickness measurement, Coating thickness; E beam evaporation; Evolution reactions; H 2 evolution; Hydrogen-evolution; Photocorrosion; Photoelectrocatalysts; Photoelectrocatalytic activities; Solar water splitting; TiO2/cu2O heterojunction photocathode, Titanium dioxide
URI: http://eprints.lqdtu.edu.vn/id/eprint/10907

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