期刊
ELECTROCHIMICA ACTA
卷 321, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134720
关键词
Oxygen evolution reaction; Electrocatalysis; Iron/nickel alloy; Nitrogen-doped nanocarbon
资金
- National Natural Science Foundation of China [21773024, 51372033]
It is significant and challenging to develop a highly active, hyper stable and low-cost novel oxygen evolution reaction (OER) electrocatalyst to replace the noble metal-based electrocatalysts for large-scale electrocatalytic water splitting. To settle such issue, for the first time, FeNi alloy nanosphere homogenously embedded porous nitrogen-doped nanocarbon (FeNi@NC) hybrid has been synthesized by pyrolyzing a precursor composite composed of nickel hexacyanoferrate and nitrogen-doped nanocarbon under the inert atmospheres without any further post-treatments. The as-prepared uniform FeNi alloy nanosphere embedded porous nitrogen-doped nanocarbon (FeNi@NC) hybrid exhibits a very low over-potential of 298 mV (vs. RHE) at current density of 10 mA cm(-2) , a small Tafel slope of 48.4 mV dec(-1) and excellent stability after 1.26 x 10(5) s (more than 35 h) at 10 mA cm(-2) towards OER. In addition, the mass normalized activity of FeNi@NC hybrid measured at fixed potential of 1.7 V (vs. RHE) is 295.9 A g(-1). The outstanding OER performance can be attributed to the porous nitrogen-doped nanocarbon structure, high specific surface area as well as good electrical conductivity. The results indicate that this work provides a new strategy to fabricate other transition bimetallic alloy embedded porous nitrogen-doped nanocarbon hybrid as OER electrocatalysts in the further. (C) 2019 Elsevier Ltd. All rights reserved.
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