Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201801912
Keywords
acidic electrolyte; electrocatalysis; Fe-N-4 sites; nanocarbon; water oxidation
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Funding
- NSFC [51702284]
- Fundamental Research Funds for the Central Universities [112109*172210171]
- Startup Foundation for Hundred-Talent Program of Zhejiang University [112100193820101/001/022]
- U.S. DOE fuel cell technologies Offices
- Selfdetermined Research Funds of CCNU from Colleges' Basic Research and Operation of MOE [23020205170456]
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Development of inexpensive and efficient oxygen evolution reaction (OER) catalysts in acidic environment is very challenging, but it is important for practical proton exchange membrane water electrolyzers. A molecular iron-nitrogen coordinated carbon nanofiber is developed, which is supported on an electrochemically exfoliated graphene (FeN4/NF/EG) electrocatalyst through carbonizing the precursor composed of iron ions absorbed on polyaniline-electrodeposited EG. Benefitting from the unique 3D structure, the FeN4/NF/EG hybrid exhibits a low overpotential of approximate to 294 mV at 10 mA cm(-2) for the OER in acidic electrolyte, which is much lower than that of commercial Ir/C catalysts (320 mV) as well as all previously reported acid transitional metal-derived OER electrocatalysts. X-ray absorption spectroscopy coupled with a designed poisoning experiment reveals that the molecular Fe-N-4 species are identified as active centers for the OER in acid. The first-principles-based calculations verify that the Fe-N-4-doped carbon structure is capable of reducing the potential barriers and boosting the electrocatalytic OER activity in acid.
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