Abstract
The urea oxidation reaction (UOR) is an attractive alternative to the oxygen evolution reaction that can be used in hydrogen production. Herein, we propose a new composite catalyst via a two-step method, including the in-situ growth of Ni12P5 on the nickel foam (NF) substrate, and subsequently, the Ni3Se2/MoO2@Ni12P5/NF catalyst is synthesized by the rapid electrodeposition of Ni3Se2/MoO2 on the Ni12P5. The prepared Ni3Se2/MoO2@Ni12P5/NF demonstrates a hierarchical and heterogeneous structure with abundant Schottky vacancies, displaying an ultra-low potential of 1.277 V at 10 mA cm−2 and a Tafel value of 53.8 mV dec−1, which are comparable to those of noble metal-based catalysts. In addition, the performance retention is 97.4% after the durability test for 120 h, demonstrating its remarkable stability for the UOR. The electrochemical results show that Schottky vacancies are beneficial to the adsorption of OH− and release O2 from the electrode surface, leading to the enhanced catalytic performance.
Published Version
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