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Open AccessArticle

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

Mechanical Design and Materials Department, Faculty of Energy Engineering, Aswan University, Aswan 81521, Egypt
National Institute for Materials Science (NIMS), Research Center for Strategic Materials, 1-2-1Sengen, Tsukuba-shi, Ibaraki-ken 305-0047, Japan
Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-Ku, Tokyo 169-8555, Japan
Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
Department of Mechanical Engineering, Faculty of Engineering, Kafrelsheikh University, Elgaishstreet, Kafrelsheikh 33516, Egypt
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
Materials 2016, 9(9), 759;
Received: 29 July 2016 / Revised: 26 August 2016 / Accepted: 30 August 2016 / Published: 6 September 2016
(This article belongs to the Section Energy Materials)
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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