1CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, P R China
2University of Chinese Academy of Sciences, Beijing 100049, PR China
Adv. Mater. Lett., 2017, 8 (3), pp 223-228
DOI: 10.5185/amlett.2017.1491
Publication Date (Web): Jan 28, 2017
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E-mail: wangjz@sxicc.ac.cn
Nitrogen-doped graphene flakes/dots/Fe3N hybrids were synthesized by electrochemical charging/discharging of graphite in ionic liquid/water followed by thermal annealing at the presence of FeCl3. Rich edges of graphene dots and porous graphene flakes from electrochemical etching probably supply heteroatom-doping sites and active catalytic sites while porous graphene flakes support good electrical conductivity and pathway for electrons/ions/gases. The graphene flakes/dots/Fe3N material obtained at 700 °C shows the highest oxygen reduction reaction (ORR) activity with half-wave potential of 753 mV (vs RHE) and better durability and tolerance of methanol than Pt/C.
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