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Title: Co₂P@N,P-codoped carbon nanofiber as a free-standing air electrode for Zn-air batteries : synergy effects of CoNₓ satellite shells
Authors: Gao, Jingchang
Wang, Jinming
Zhou, Lijun
Cai, Xiaoyi
Zhan, Da
Hou, Mingzhen
Lai, Linfei
Keywords: Science::Physics
Issue Date: 2019
Source: Gao, J., Wang, J., Zhou, L., Cai, X., Zhan, D., Hou, M. & Lai, L. (2019). Co₂P@N,P-codoped carbon nanofiber as a free-standing air electrode for Zn-air batteries : synergy effects of CoNₓ satellite shells. ACS Applied Materials and Interfaces, 11(10), 10364-10372.
Journal: ACS Applied Materials and Interfaces 
Abstract: Here, a free-standing electrode composed of cobalt phosphides (Co₂P) supported by cobalt nitride moieties (CoNₓ) and an N,P-codoped porous carbon nanofiber (CNF) in one-step electrospinning of environmentally friendly benign phosphorous precursors is reported. Physiochemical characterization revealed the symbiotic relationship between a Co₂P crystal and surrounding nanometer-sized CoNₓ moieties embedded in an N,P-codoped porous carbon matrix. Co₂P@CNF shows high oxygen reduction reaction and oxygen evolution reaction performance owing to the synergistic effect of Co₂P nanocrystals and the neighboring CoNₓ moieties, which have the optimum binding strength of reactants and facilitate the mass transfer. The free-standing Co₂P@CNF air-cathode-based Zn-air batteries deliver a power density of 121 mW cm⁻² at a voltage of 0.76 V. The overall overpotential of Co₂P@CNF-based Zn-air batteries can be significantly reduced, with low discharge-charge voltage gap (0.81 V at 10 mA cm⁻²) and high cycling stability, which outperform the benchmark Pt/C-based Zn-air batteries. The one-step electrospinning method can serve as a universal platform to develop other high-performance transition-metal phosphide catalysts benefitting from the synergy effect of transition nitride satellite shells. The free-standing and flexible properties of Co₂P@CNF make it a potential candidate for wearable electronic devices.
ISSN: 1944-8244
DOI: 10.1021/acsami.8b20003
Rights: © 2019 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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