Journal
JOURNAL OF POWER SOURCES
Volume 280, Issue -, Pages 640-648Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.01.147
Keywords
Nickel cobalt oxide; Nitrogen doped graphene; Oxygen reduction reaction; Electrocatalyst; Active sites
Funding
- National Nature Science Foundation of China [21271187, 21301193]
- Hunan Provincial Natural Science Foundation of China [14JJ3022]
- Special Funded Project of the Postdoctoral Science Foundation of China [2014T70781]
- Open-End Fund for Valuable and Precision Instruments of Central South University [CSUZC2014 018]
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Developing low-cost catalyst for high-performance oxygen reduction reaction (ORR) is highly desirable. Herein, NiCo2O4/N-doped reduced graphene oxide (NiCo2O4/N-rGO) hybrid is proposed as a high-performance catalyst for ORR for the first time. The well-formed NiCo2O4/N-rGO hybrid is studied by cyclic voltammetry (CV) curves and linear-sweep voltammetry (LSV) performed on the rotating-ring-disk-electrode (ROE) in comparison with N-rGO-free NiCo2O4 and the bare N-rGO. Due to the synergistic effect, the NiCo2O4/N-rGO hybrid exhibits significant improvement of catalytic performance with an onset potential of -0.12 V, which mainly favors a direct four electron pathway in ORR process, close to the behavior of commercial carbon-supported Pt. Also, the benefits of N-incorporation are investigated by comparing NiCo2O4/N-rGO with NiCo2O4/rGO, where higher cathodic currents, much more positive half-wave potential and more electron transfer numbers are observed for the N-doping one, which should be ascribed to the new highly efficient active sites created by N incorporation into graphene. The NiCo2O4/N-rGO hybrid could be used as a promising catalyst for high power metal/air battery. (C) 2015 Elsevier B.V. All rights reserved.
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