Journal
ACS ENERGY LETTERS
Volume 3, Issue 4, Pages 861-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00342
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Funding
- MOST [2017YFA0303500, 2014CB848900]
- NSFC [U1532112, 11574280, 11605201, 21706248]
- CAS Key Research Program of Frontier Sciences [QYZDB-SSW-SLH018]
- China Postdoctoral Science Foundation [BH2310000033]
- CAS Interdisciplinary Innovation Team, Innovative Program of Development Foundation of Hefei Center for Physcial Science [T6FXCX003]
- CAS Hundred Talent Program, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University (111 project) [B12015]
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Transition metal Fe-dominated materials generally show inefficient electrocatalytic oxygen evolution reaction (OER), while Fe-incorporated multimetallic compounds can exhibit high catalytic activity. In fact, there is always a controversy about the main active sites in Fe-involved OER elelctrocatalysts. Herein, we demonstrate a highly active mono-Fe-based OER electrocatalyst with a very low overpotential of 283 mV at a current density of 10 mA cm(-2) and a Tafel slope of 41.4 mV dec(-1). Systematic characterization reveals that the OER performance stems from Na dissolution during the electrocatalytic oxidation process, enabling the electrocatalyst reconstruction to form highly defective oxyhydroxides as highly active catalytic sites. Notably, the electrocatalytic activity can be significantly promoted through the introduction of a heterotransition metal. This work provides insights for active sites in OER catalysis, along with a facile route to tune the intrinsic activity.
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