Yin Ruilian, Wang Zhiwei, Zhang Jin, Liu Wenxian, He Jia, Hu Guangzhi, Liu Xijun
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China.
Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, 530004, China.
Small Methods. 2025 Jul;9(7):e2401976. doi: 10.1002/smtd.202401976. Epub 2025 Jan 7.
Urea-assisted water splitting is a promising energy-saving hydrogen (H) production technology. However, its practical application is hindered by the lack of high-performance bifunctional catalysts for urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). Herein, a heterostructured catalyst comprising highly active NiSe and NiSe, along with a conductive graphene-coated nickel foam skeleton (NiSe-NiSe/GNF) is reported. The heterostructured NiSe-NiSe originates from the in situ selenization of graphene-coated nickel foam, allowing for careful regulation of the NiSe to NiSe ratio by simply adjusting the calcination temperature. Theoretical calculations of the charge transfer between NiSe and NiSe components can optimize the reaction pathways and reduce the corresponding energy barriers. Accordingly, the designed catalyst exhibits excellent UOR and HER activity and stability. Furthermore, the NiSe-NiSe/GNF-based UOR-HER electrolyzer requires only 1.54 V to achieve a current density of 50 mA cm, which is lower than many recent reports and much lower than 1.83 V of NiSe-NiSe/GNF-based OER-HER electrolyzers. Moreover, the UOR-HER electrolyzer exhibited negligible cell voltage variation during a 28-h stability test, indicating satisfactory stability, which provides a new viable paradigm for energy-saving H production.
尿素辅助水分解是一种很有前景的节能制氢技术。然而，其实际应用受到缺乏用于尿素氧化反应（UOR）和析氢反应（HER）的高性能双功能催化剂的阻碍。在此，报道了一种异质结构催化剂，其由高活性的NiSe和NiSe以及导电的石墨烯包覆泡沫镍骨架（NiSe-NiSe/GNF）组成。异质结构的NiSe-NiSe源自石墨烯包覆泡沫镍的原位硒化，通过简单调节煅烧温度可精确调控NiSe与NiSe的比例。对NiSe和NiSe组分之间电荷转移的理论计算能够优化反应路径并降低相应的能垒。因此，所设计的催化剂表现出优异的UOR和HER活性及稳定性。此外，基于NiSe-NiSe/GNF的UOR-HER电解槽仅需1.54 V就能实现50 mA cm的电流密度，这低于许多近期报道，且远低于基于NiSe-NiSe/GNF的OER-HER电解槽的1.83 V。此外，在28小时的稳定性测试中，UOR-HER电解槽的电池电压变化可忽略不计，表明其具有令人满意的稳定性，这为节能制氢提供了一种新的可行范例。
