FeN4 Sites Embedded into Carbon Nanofiber Integrated with Electrochemically Exfoliated Graphene for Oxygen Evolution in Acidic Medium |
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| Authors: | Chaojun Lei Hengquan Chen Junhui Cao Jian Yang Ming Qiu Ying Xia Chris Yuan Bin Yang Zhongjian Li Xingwang Zhang Lecheng Lei Janel Abbott Yu Zhong Xinhui Xia Gang Wu Qinggang He Yang Hou |
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| Affiliation: | 1. Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China;2. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical & Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, China;3. Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, China;4. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, USA;5. Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA;6. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, China |
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| Abstract: | 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 ≈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?N4 species are identified as active centers for the OER in acid. The first‐principles‐based calculations verify that the Fe?N4–doped carbon structure is capable of reducing the potential barriers and boosting the electrocatalytic OER activity in acid. |
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| Keywords: | acidic electrolyte electrocatalysis Fe N4 sites nanocarbon water oxidation |
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