Qing-Qing Zhang, Yan-Na Xu, De-Rong Duan, Heng-Jun Su, Tao Wang, Xiao-Jun Zeng
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引用次数: 0
Abstract
The existence of multiple vacancies leads to significant changes in the local atomic structure, which can regulate the electronic structure of the surface and form unsaturated coordination geometries. However, the current methods employed to generate multiple vacancies in two-dimensional (2D) layered double hydroxide (LDH) materials are still difficult to achieve to some extent and are primarily limited to monolayer LDH structures. Here, we present an improved method to synthesize NiMoP/Ni2P catalysts with a sponge-like porous structure. Firstly, NiO with dual defects was constructed by subjecting NiMo-LDH/Ni to air calcination. Subsequently, we performed phosphorization treatment and introduced multiple Ni vacancies and O vacancies as defect sites to tune the edge and substrate surfaces of LDH. At the same time, the electronic structure was tuned by adding P heteroatoms. The synergistic effect of porous structure, heterogeneous interfaces, vacancies, doping defects, and amorphous states can greatly enhance the electron transfer effect inside the catalysts, which significantly improves the catalytic ability of the oxygen evolution reaction (OER). Therefore, the overpotential for the oxygen evolution reaction of NiMoP/Ni2P heterointerfaces reaches 270 mV at a current density of 10 mA·cm−2 under alkaline conditions, with the catalysts capable of sustaining high current densities even after the durability testing for 35 h.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.