Linyi Wu and Shuchang Guan and Binghua Zhou and Shien Guo and Jie Wang and Ling Wu and Gan Jet Hong Melvin and Josue Ortiz-Medina and Mingxi Wang and Hironori Ogata and Masaki Tanemura and Yoong Ahm Kim (2024) Plasma-induced N doping and carbon vacancies in a self-supporting 3C-SiC photoanode for efficient photoelectrochemical water oxidation. Journal of Materials Chemistry A, 12. pp. 19201-19211. ISSN 2050-7488
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Abstract
Due to its suitable bandgap and excellent stability, 3C-SiC is being investigated as one of the promising candidates for photoelectrochemical (PEC) water oxidation. However, the limited surface activity and short carrier lifetime prevent 3C-SiC photoanodes from facilitating efficient PEC water splitting. To tackle these problems, this work proposes a plasma technique to control the crystal structure and optical characteristics of 3C-SiC. Nitrogen plasma induces carbon vacancies (Vc) and Si–N bonds, further leading to a narrower bandgap of 3C-SiC. The combination of Vc and N doping enhanced the light trapping capability of the electrode, thereby improving the efficiency of electron–hole pair separation and charge transfer, resulting in an accelerated water oxidation reaction, i.e., photocurrent density (2.50 mA cm−2 at 1.23 VRHE) increased by 7.6 times compared to that of pristine SiC. This work offers an effective strategy for regulating the electronic structure of SiC-based photoanodes by plasma treatment, which may be extended to other photoelectrodes for PEC application.
| Item Type: | Article |
|---|---|
| Keyword: | Carbon, Carrier lifetime, Charge transfer, Crystal structure, electronic structure, Energy gap, Oxidation, Photoelectrochemical cells, Plasma applications, Silicon |
| Subjects: | Q Science > QD Chemistry > QD1-999 Chemistry > QD146-197 Inorganic chemistry Q Science > QD Chemistry > QD1-999 Chemistry > QD901-999 Crystallography |
| Department: | FACULTY > Faculty of Engineering |
| Depositing User: | JUNAINE JASNI - |
| Date Deposited: | 08 Aug 2025 15:31 |
| Last Modified: | 08 Aug 2025 15:31 |
| URI: | https://eprints.ums.edu.my/id/eprint/44779 |
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