期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 3, 页码 2878-2889出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.04.176
关键词
Cuprous oxide (Cu2O); Electrochemical deposition; Semiconductor films; Photoelectrode; Photoelectrochemical cell; Water splitting
资金
- Shaanxi Provincial Education Department [17JS121]
- Top-rated Discipline construction scheme of Shaanxi higher education in China
- Open Fund of the State Key Laboratory of Multiphase Flow in Power Engineering of China
Cuprous oxide (Cu2O) is a low-cost material that shows promise in water splitting for hydrogen and oxygen production. A novel electrochemical technology called differential potentiostatic deposition (DPD) was developed to investigate the conductivity transformation in Cu2O films during deposition. The results demonstrate that with the DPD method, the conductivity of Cu2O films can be tuned from p-type to n-type by adjusting the current density.
Cuprous oxide (Cu2O) is a kind of low-cost and promising material for water splitting to produce hydrogen (p-type Cu2O) and oxygen (n-type Cu2O). However, the reason of conductivity transforming from p-type to n-type for Cu2O films during potentiostatic deposition is waiting to be revealed. In this work, a novel electrochemical technology, differential potentiostatic deposition (DPD), is developed by coupling a 3-electrode setup with a resistor connected in series with the counter electrode circuit through a potentiostat. By this approach, deposition current density is adjusted in a short period to simulate different stages in a traditional potentiostatic deposition (TPD). The result shows that semiconducting conductivity of Cu2O film changes from p-type to n-type with time during a long-term TPD in basic CuSO4 solution. Employing the DPD method, conductivity of Cu2O film transforms from p-type to n-type with current density decreasing. Through characterizing thickness, composition and photoelectrochemical performance of Cu2O films, the mechanism of semiconducting conductivity transformation for Cu2O films is proposed. Besides, the results indicate that the DPD is an effective method to tune the conductivity of metal oxide photoelectrodes for water splitting. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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