Affiliation:
1. State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116023 P. R. China
2. School of Chemical Engineering Dalian University of Technology Panjin 124221 P. R. China
Abstract
AbstractThe exploring of economical, high‐efficiency, and stable bifunctional catalysts for hydrogen evolution and oxygen evolution reactions (HER/OER) is highly imperative for the development of electrolytic water. Herein, a 3D cross‐linked carbon nanotube supported oxygen vacancy (Vo)‐rich N‐NiMoO4/Ni heterostructure bifunctional water splitting catalyst (N‐NiMoO4/Ni/CNTs) is synthesized by hydrothermal‐H2 calcination method. Physical characterization confirms that Vo‐rich N‐NiMoO4/Ni nanoparticles with an average size of ≈19 nm are secondary aggregated on CNTs that form a hierarchical porous structure. The formation of Ni and NiMoO4 heterojunctions modify the electronic structure of N‐NiMoO4/Ni/CNTs. Benefiting from these properties, N‐NiMoO4/Ni/CNTs drives an impressive HER overpotential of only 46 mV and OER overpotential of 330 mV at 10 mA cm−2, which also shows exceptional cycling stability, respectively. Furthermore, the as‐assembled N‐NiMoO4/Ni/CNTs||N‐NiMoO4/Ni/CNTs electrolyzer reaches a cell voltage of 1.64 V at 10 mA cm−2 in alkaline solution. Operando Raman analysis reveals that surface reconstruction is essential for the improved catalytic activity. Density functional theory (DFT) calculations further demonstrate that the enhanced HER/OER performance should be attributed to the synergistic effect of Vo and heteostructure that improve the conductivity of N‐NiMoO4/Ni/CNTs and facilitatethe desorption of reaction intermediates.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
9 articles.
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