Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 46, Pages 23207-23212Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta06788j
Keywords
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Funding
- National Natural Science Foundation of China [21175129]
- National Basic Research Program of China [2011CB935800]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030104]
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The efficiency of water splitting is mainly limited by the low rate of the oxygen evolution reaction (OER) and it is thus of great importance but still remains a huge challenge to develop efficient OER catalysts capable of delivering high current densities at low overpotentials. Herein, we describe our recent finding that a Fedoped Ni3S2 particle film with 11.8% Fe-content hydrothermally grown on nickel foam (Fe-11.8%-Ni3S2/NF) behaves as a highly active robust oxygen evolution electrode in strongly alkaline media. This electrode needs an overpotential of only 253 mV to achieve 100 mA cm(-2) with a Tafel slope of 65.5 mV dec(-1) and maintains its catalytic activity for at least 14 h in 1 M KOH, and the NiOOH and FeOOH formed at the Fe-11.8%-Ni3S2 surface are the actual catalytic sites. Notably, it also operates efficiently and stably in 30 wt% KOH, capable of affording very high current densities of 500 and 1000 mA cm(-2) at small overpotentials of 238 and 269 mV, respectively, with a faradaic efficiency of 100%.
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