期刊
CHEMICAL ENGINEERING JOURNAL
卷 424, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130444
关键词
Hydrogen evolution reaction (HER); Electroless plating; Electron holography; Interfacial charge redistribution; Metal phosphide
资金
- National Natural Science Foundation of China [51725101, 11727807, 51672050, 61790581]
- Ministry of Science and Technology of China (973 Project) [2018YFA0209102]
- Fundamental Research Funds for the Central Universities of Ministry of Education (Southeast University)
- Science and Technology Department of Jiangsu Province of China
The binder-free Ni2P-Co2P/CC electrocatalyst exhibits outstanding HER activity in alkaline and acidic conditions, attributed to abundant interfacial contact, regulated electronic structure, hydrophilic surface, and interfacial charge redistribution contributing more high-valence Ni active sites. This work demonstrates the potential of facile strategy for the design and preparation of highly efficient phosphide electrocatalysts.
In this study, scalable and facile electroless plating accompanied with phosphorization process is explored for preparation of interconnected network of Ni2P-Co2P on carbon clothes (CC) substrate. The binder-free Ni2P-Co2P/CC electrocatalyst with optimized Ni2P:Co2P ratio displays outstanding HER activity in both alkaline and acidic conditions requiring only 93 mV and 172 mV vs. RHE of overpotential to reach 10 mA cm-2 of current density. The superior HER activity of Ni2P-Co2P/CC could be attributed to (i) the abundant interfacial contact and larger electrochemical surface area; (ii) regulated electronic structure and hydrophilic surface of the catalyst, and (iii) interfacial charge redistribution contributing more high-valence Ni active sites, as visualized by off-axis electron holography. Overall, this work directly demonstrates the interfacial charge redistribution in Ni2P-Co2P/CC interconnected network, and suggests a facile strategy for structural design and preparation of highly efficient phosphide electrocatalysts.
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