Constructionof CoSe<sub>2</sub>/WO<sub>3</sub>@SiMultiheterojunctions for Efficient Photoelectrochemical Water Splitting
Developing efficient photoanodes for photoelectrochemical (PEC) water splitting is crucial for solar-to-hydrogen energy conversion. Monocrystalline silicon, as a photoelectrode material, has limitations of high surface reflectivity, easy formation of oxide passivation, and instability in aqueous solutions. Herein, flower cluster CoSe<sub>2</sub> and lamellar WO<sub>3</sub> obtained via the solvothermal method are coated onto the surface of textured silicon by chemical bath deposition to prepare a multiheterojunction structured photoanode. The as-prepared CoSe<sub>2</sub>/WO<sub>3</sub>@Si-9 photoelectrode exhibits a desirable photocurrent of 10.1 mA cm<sup>–2</sup> at 1.23 V<sub>RHE</sub> under simulated solar irradiation (AM 1.5G, 100 mW cm<sup>–2</sup>) in comparison to WO<sub>3</sub>@Si (0.49 mA cm<sup>–2</sup>) and CoSe<sub>2</sub>@Si (1.56 mA cm<sup>–2</sup>) and excellent stability over 10 h. The improved PEC hydrogen evolution performance comes from the synergistic effect of the multiple heterojunctions of CoSe<sub>2</sub>/WO<sub>3</sub>@Si composites. The synergistic effect can improve the separation efficiency of photogenerated electron-hole pairs while maintaining strong redox capability. The CoSe<sub>2</sub>/WO<sub>3</sub>@Si-9 photoanode exhibits a high photocurrent density and stability, making it a promising candidate for practical applications.
Publication Details
- Journal
- Figshare
- Published
- 2025-02-22
- DOI
- https://doi.org/10.1021/acs.langmuir.4c04869.s001
- Primary Topic
- Advanced Photocatalysis Techniques
- Type
- article
- Field-Weighted Citation Impact
- 0.00