Journal
JOURNAL OF POWER SOURCES
Volume 250, Issue -, Pages 196-203Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.11.024
Keywords
Bi-functional electrocatalyst; Oxygen reduction reaction; Oxygen evolution reaction; Spinel oxide/graphene nanohybrid
Funding
- National Natural Science Foundation of China [51272167, 21206101]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China [12KJB430010]
- Sino-German Network on Electromobility
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Development of efficient electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) remain key issues for the commercialization of fuel cells and metal-air batteries. In this study, A CoFe2O4/graphene nanohybrid is facilely synthesized via a two-step process and applied as an electrocatalyst for the ORR and the OER. The as-prepared CoFe2O4/graphene nanohybrid demonstrates excellent catalytic activity for the ORR. At the same mass loading, the Tafel slope of CoFe2O4/graphene electrocatalyst for the ORR is comparable to that of the commercial Pt/C (20 wt% Pt on Vulcan XC-72, Johnson Matthey). The ORR on CoFe2O4/graphene mainly favours a direct 4e(-) reaction pathway. The CoFe2O4/graphene nanohybrid also affords high catalytic activity for the OER. The chronoamperometric tests show that CoFe2O4/graphene catalyst exhibits excellent stability for both the ORR and the OER, outperforming the commercial Pt/C. The high electrocatalytic activity and durability of CoFe2O4/graphene nanohybrid are attributed to the strong coupling between CoFe2O4 nanoparticles and graphene. (C) 2013 Elsevier B.V. All rights reserved.
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