Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7706052 | International Journal of Hydrogen Energy | 2018 | 9 Pages |
Abstract
Uniform p-type CuBi2O4 thin film was prepared through a spin coating method on fluorine-doped tin oxide (FTO) coated glass substrate, with a subsequent hypoxic post-annealing process under semi-sealed condition to enhance its photoelectrochemical efficiency for hydrogen evolution reaction. Compared to CuBi2O4 specimen annealed in open-air environment, the semi-sealed annealed CuBi2O4 photocathode presents a remarkable improvement in cathodic photocurrent, from 0.42Â mA/cm2 to 0.7Â mA/cm2 at 0.25 VRHE. X-ray photoelectron spectroscopy study revealed that the electronic structure of CuBi2O4 film was significantly modified during the post-annealing process and higher carrier concentration was obtained through Mott-Schottky measurement on semi-annealed CuBi2O4. We also demonstrate that the synthesized CuBi2O4 film with a thin overlayer of sputtered TiO2 can retain good stability and efficiency as a photocathode. This work provides insights into the mechanism of the high efficiency CuBi2O4 photocathode achieved from the unique post-annealing treatment.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jie Yang, Chun Du, Yanwei Wen, Zijing Zhang, Kyeongjae Cho, Rong Chen, Bin Shan,