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One‐Pot Synthesis of a Highly Active 3‐Dimensional Fe−N x −CNTs/rGO Composite Catalyst for Oxygen Reduction
Author(s) -
Hu Ye,
Yang Ruoou,
Chen Hengquan,
Han Shaobo,
Wang Junhu,
Wang Xiaojiang,
Deng Xin,
He ChaoHong,
He Qinggang,
Jiang Zheng,
Gu Meng
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801240
Subject(s) - catalysis , graphene , materials science , dispersion (optics) , transmission electron microscopy , mössbauer spectroscopy , chemical engineering , current density , scanning electron microscope , composite number , absorption spectroscopy , spectroscopy , oxygen , absorption (acoustics) , diffusion , nanotechnology , chemistry , crystallography , composite material , organic chemistry , physics , engineering , quantum mechanics , optics , thermodynamics
A facile one‐pot method to synthesize a Fe−N x −CNTs/rGO catalyst by using melamine and FeCl 2 ⋅4H 2 O as low‐cost precursors is reported.The 3‐dimensional porous structure and the dispersion of precursor were completed at the same time. Suitable precursor and concentration selection not only solved the aggregation of graphene but also improved its effective iron content and activity. The obtained catalysts exhibited oxygen reduction activitycomparable to commercial Pt/C with a half‐wave potential (the potential when current density reaches the half of the diffusion‐limited current density) at 0.875 V(vs. RHE) in alkaline media. In addition, it also showed a better stability than Pt/C with a lower decay of E 1/2 (10 mV) after 2000 cycles. From the systematic physical characterizations including aberration‐corrected scanning transmission electron microscopy, 57 Fe Mössbauer spectroscopy and X‐ray absorption spectroscopy, it was discovered that a unique structure with the coexistence of nitrogen‐coordinated single iron atoms and Fe/Fe 2 C nanocrystals had been formed.