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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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 |
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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 |