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Materials 2016, 9(9), 759; doi:10.3390/ma9090759

Carbon Supported Engineering NiCo2O4 Hybrid Nanofibers with Enhanced Electrocatalytic Activity for Oxygen Reduction Reaction

1
Mechanical Design and Materials Department, Faculty of Energy Engineering, Aswan University, Aswan 81521, Egypt
2
National Institute for Materials Science (NIMS), Research Center for Strategic Materials, 1-2-1Sengen, Tsukuba-shi, Ibaraki-ken 305-0047, Japan
3
Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-Ku, Tokyo 169-8555, Japan
4
Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
5
Department of Mechanical Engineering, Faculty of Engineering, Kafrelsheikh University, Elgaishstreet, Kafrelsheikh 33516, Egypt
6
Production Engineering and Design Department, Faculty of Engineering, Minia University, El-Minia 61519, Egypt
*
Author to whom correspondence should be addressed.
Academic Editor: Nicole Zander
Received: 29 July 2016 / Revised: 26 August 2016 / Accepted: 30 August 2016 / Published: 6 September 2016
(This article belongs to the Section Energy Materials)
View Full-Text   |   Download PDF [2406 KB, uploaded 6 September 2016]   |  

Abstract

The design of cheap and efficient oxygen reduction reaction (ORR) electrocatalysts is of a significant importance in sustainable and renewable energy technologies. Therefore, ORR catalysts with superb electrocatalytic activity and durability are becoming a necessity but still remain challenging. Herein, we report C/NiCo2O4 nanocomposite fibers fabricated by a straightforward electrospinning technique followed by a simple sintering process as a promising ORR electrocatalyst in alkaline condition. The mixed-valence oxide can offer numerous accessible active sites. In addition, the as-obtained C/NiCo2O4 hybrid reveals significantly remarkable electrocatalytic performance with a highly positive onset potential of 0.65 V, which is only 50 mV lower than that of commercially available Pt/C catalysts. The analyses indicate that C/NiCo2O4 catalyst can catalyze O2-molecules via direct four electron pathway in a similar behavior as commercial Pt/C catalysts dose. Compared to single NiCo2O4 and carbon free NiCo2O4, the C/NiCo2O4 hybrid displays higher ORR current and more positive half-wave potential. The incorporated carbon matrices are beneficial for fast electron transfer and can significantly impose an outstanding contribution to the electrocatalytic activity. Results indicate that the synthetic strategy hold a potential as efficient route to fabricate highly active nanostructures for practical use in energy technologies. View Full-Text
Keywords: NiCo2O4; PAN; electrospinning; nanofiber; ORR NiCo2O4; PAN; electrospinning; nanofiber; ORR
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Hassan, D.; El-safty, S.; Khalil, K.A.; Dewidar, M.; Abu El-magd, G. Carbon Supported Engineering NiCo2O4 Hybrid Nanofibers with Enhanced Electrocatalytic Activity for Oxygen Reduction Reaction. Materials 2016, 9, 759.

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