Journal
ELECTROCHIMICA ACTA
Volume 267, Issue -, Pages 8-14Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.01.192
Keywords
Oxygen evolution reaction; Powdery catalyst; Iron-nickel nitride; CNTs; Galvanic replacement
Categories
Funding
- National Natural Science Foundation of China [21405119]
- Natural Science Basic Research Plan in Shanxi Province of China [2015JQ2046]
- China Postdoctoral Science Foundation [2014M562392]
- Fundamental Research Funds for the Central Universities [08143099]
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The efficiency of energy storage technologies such as water splitting and metal-air batteries is limited by the sluggish dynamics of the oxygen evolution reaction (OER). Herein, we report a galvanic replacement-mediated method for in-situ growth of iron-nickel nitride on carbon nanotubes (CNTs) as a powdery catalyst for OER. This in-situ grown structure creates intimate interaction between the active substance of Fe2Ni2N and CNTs so as to accelerate charge transfer in the catalytical interface. First-principles calculations reveal that the Fe2Ni2N is intrinsically metallic, and the contribution mainly derives from the Fe atoms at corner sites of crystal structures. A good synergistic effect between metallic Fe2Ni2N with excellent intrinsic activity and conductive CNTs lead to outstanding electrochemical performance with a low overpotential (eta(10) (mAcm-2) = 282 mV) and Tafel slope (38 mV dec(-1)), as well as good long-term stability. (c) 2018 Elsevier Ltd. All rights reserved.
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