Zhuo Xiaoyan, Jiang Wenjie, Yu Tianqi, Qian Guangfu, Chen Jinli, Yang Haifeng, Yin Shibin
Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, 100 Daxue Road, Nanning530004, China.
College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning530004, China.
ACS Appl Mater Interfaces. 2022 Oct 19;14(41):46481-46490. doi: 10.1021/acsami.2c11238. Epub 2022 Oct 4.
Developing bifunctional catalysts with good performance at a high current density for the urea oxidation reaction (UOR) and the hydrogen evolution reaction (HER) can effectively relieve the severe environmental and energy pressures. Herein, amorphous NiMoO decorated NiS grown on nickel foam (NiS-NiMoO/NF) is prepared to accelerate UOR and HER. The crystalline-amorphous heterostructure could regulate the interfacial electron structure to reduce the electron density near NiS for optimizing UOR and HER. The decoration of NiMoO enhances its anti-poisoning ability for CO-intermediate species to show good stability at high current densities. Meanwhile, the nano-/microstructure with high hydrophilicity improves mass transfer and the accessibility of electrolyte. Driving high current densities of ±1000 mA cm, it merely needs 1.38 V (UOR) and -263 mV (HER). For urea electrolysis, it can deliver 1000 mA cm at 1.73 V and stably operate at 500 mA cm for 120 h. Therefore, this study provides new ideas for durable urea electrolysis-assisted H production.
开发在高电流密度下对尿素氧化反应（UOR）和析氢反应（HER）具有良好性能的双功能催化剂，可以有效缓解严峻的环境和能源压力。在此，制备了生长在泡沫镍上的非晶态NiMoO修饰的NiS（NiS-NiMoO/NF）以加速UOR和HER。晶态-非晶态异质结构可以调节界面电子结构，降低NiS附近的电子密度，从而优化UOR和HER。NiMoO的修饰增强了其对CO中间物种的抗中毒能力，使其在高电流密度下表现出良好的稳定性。同时，具有高亲水性的纳米/微观结构改善了传质和电解质的可及性。在±1000 mA cm的高电流密度下，UOR仅需1.38 V，HER仅需-263 mV。对于尿素电解，它在1.73 V时可提供1000 mA cm，并在500 mA cm下稳定运行120 h。因此，本研究为耐用的尿素电解辅助制氢提供了新思路。
