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Abstract
Noble metal nanoparticles have been widely used in the field of cocatalyst due to their excellent photocatalytic activity. However, its high cost and limited resources have prompted an urgent search for efficient and economical non-precious metal alternatives. The FeCo2O4/ZnCdS composite catalyst was constructed by electrostatic self-assembly using the common FeCo2O4 material. By precisely adjusting the optimal load ratio of FeCo2O4 to 10 wt%, the hydrogen production efficiency of FeCo2O4/ ZnCdS is as high as 9080 μmol·g-1·h-1. This is 3.49 times higher than ZnCdS, which is significantly better than precious metal co-catalysts such as Au. KPFM (Kelvin probe force microscope), XPS (X-ray photoelectron spectroscopy) and DFT (Density Functional Theory calculations) show that the S-scheme heterojunction is formed between FeCo2O4 and ZnCdS. The internal electric field generated by this heterojunction effectively drives charge directed migration and significantly inhibits the photogenerated electron-hole recombination process. The DFT calculation further demonstrated that the d-band center shift induced by the interface electric field optimized the adsorption mode of the reactant molecules, which not only avoided the deactivation of the catalyst caused by the strong adsorption, but also overcame the reaction energy barrier caused by the weak adsorption, and formed a medium-strength activated state.
Published Version
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