Journal
APPLIED SURFACE SCIENCE
Volume 493, Issue -, Pages 963-974Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.07.083
Keywords
NiFe alloy; N-doping porous carbon; Graphene; Electrocatalyst; Oxygen evolution reaction
Categories
Funding
- National Natural Science Foundation of China [21875091, 21776115, 51602129]
- Natural Science Foundation of Jiangsu Province [BK20171295, BK20161343]
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Designing of cost-effective electrocatalysts for efficient oxygen evolution reaction (OER) is highly desired for the practical production of clean hydrogen energy. Herein, reduced graphene oxide (RGO) supported N-doped porous carbon-coated NiFe alloy composite (NiFe@NC/RGO) was synthesized via a facile pyrolysis route. The introduction of RGO effectively protects the active NiFe component from agglomeration and largely promotes charge transfer. Meanwhile, the formation of porous N-doped carbon shell provides sufficient contact between active species and electrolyte, thus exposing plenty of accessible active sites. Specifically, the optimized NiFe@ NC/RGO composite shows superior electrocatalytic performance, delivering an overpotential as low as 223 mV at current density of 10 mA cm(-2), and a small Tafel slope of 48.7 mV dec(-1) in 1 M KOH solution, which outperforms commercial precious metal oxide catalysts such as RuO2 and a vast majority of electrocatalysts reported so far. Long-term cycling test demonstrates that the overpotential at current density of 10 mA cm(-2) has almost no change after 1000 cycles at a scan rate of 50 mV s(-1), indicating its quite good stability. The low-cost and high-performance electrocatalyst developed in this work shows great potential for practical hydrogen production from electrolysis of water.
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