Construction of CoSe2/WO3@Si Multiheterojunctions for Efficient Photoelectrochemical Water Splitting
Li Zhang1, Kaihui Liao1, Jialu Liu2
1Key Laboratory of Fine Petrochemical Catalysis and Separation of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan 414006, PR China.
Abstract:
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 CoSe2 and lamellar WO3 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 CoSe2/WO3@Si-9 photoelectrode exhibits a desirable photocurrent of 10.1 mA cm-2 at 1.23 VRHE under simulated solar irradiation (AM 1.5G, 100 mW cm-2) in comparison to WO3@Si (0.49 mA cm-2) and CoSe2@Si (1.56 mA cm-2) and excellent stability over 10 h. The improved PEC hydrogen evolution performance comes from the synergistic effect of the multiple heterojunctions of CoSe2/WO3@Si composites. The synergistic effect can improve the separation efficiency of photogenerated electron-hole pairs while maintaining strong redox capability. The CoSe2/WO3@Si-9 photoanode exhibits a high photocurrent density and stability, making it a promising candidate for practical applications.
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