Nitrogen-doped graphene flakes/dots /Fe3N as oxygen reduction reaction electrocatalyst

Rui Yan1, 2, Huinian Zhang1, 2, Congwei Wang1, Yongzhi Liu1, Quangui Guo1, Junzhong Wang1* 

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

E-mail: wangjz@sxicc.ac.cn

Abstract


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. 

Keywords

Graphene, electrocatalyt, oxygen reduction reaction, nitrogen doping.

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