期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 44, 期 16, 页码 8156-8165出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.02.053
关键词
Trimetallic phosphide; Fe-substitution; Hierarchical nanomaterials; Oxygen evolution reaction
资金
- NSFC [21671149, 21571140, 21531005, 21703156]
- 973 Program [2014CB845601]
- Program for Innovative Research Team in University of Tianjin [TD13-5074]
- Natural Science Foundation of Tianjin [18JCQNJC76000]
- Science AMP
- Technology Development Fund of Tianjin Education Commission for Higher Education [2017KJ122]
- Doctoral Program Foundation of Tianjin Normal University [52XB1508]
Electrocatalytic water splitting for hydrogen evolution is significantly impeded by the kinetically sluggish oxygen evolution reaction (OER). Thus, the development of highly efficient and durably stable non-noble-metal OER electrocatalyst is necessary and challenging for the large-scale electrocatalytic water splitting. Herein, a series of iron-substituted cobalt-nickel phosphides grown on Ni foam (FeCoNi-P/NFs) were easily prepared though successive hydrothermal and phosphorization treatments. The chemical compositions, crystalline and electronic structures as well as surface morphologies of these resulting electrocatalysts are strongly related with the iron substitution ratio. More interestingly, the FeCoNi-P/NF-2 nanosheet arrays prepared from equivalent molar ratio of iron and cobalt precursors exhibit the best OER performance with a low overpotential of 266 mV to produce a current density of 50 mA cm(-2) and a low Tafel slope of 61.2 mV dec(-1) in 1.0 M KOH condition, which is comparable to the reported state-of-the-art OER electrocatalysts. Additionally, the FeCoNi-P/NF-2 nanosheet arrays also show satisfactory long-term durability over 60 h. The superior OER activity of the electrocatalyst is essentially attributed to the heteroatomic substitution and the unique three-dimensional hierarchical morphology, which greatly increase the electrical conductivity, afford more active sites and facilitate the efficient charge transfer ability. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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