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Highly dispersed Co nanoparticles decorated on N−doped defective carbon nano−framework for hybrid Na−Air battery

Abstract

Efficient and low−cost bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are of vital importance in energy conversion. Herein, an excellent highly dispersed Co nanoparticles decorated on N−doped defective carbon nano−framework (Co−N−C) derived from ZnCo bimetal organic framework (bi−MOF) is reported. A high specific surface area originated from zinc evaporation facilitates adsorption and desorption of oxygen, which promotes the accessibility of catalytic sites. The abundant Co−N−C species act as strong bridging bonds between Co nanoparticles and carbon materials which facilitates the interface electron transfer. The Co−N−C−0.5 (0.5 represents the molar ratio of Zn in the initial ZIF−67) exhibits a low overpotential gap of 0.94 V due to the amount of active sites (e.g. N−doped defective carbon and CoNx/Co set) and fast interface electron transfer. In addition, the hybrid Na−air battery with Co−N−C−0.5 materials displays low voltage gap of 0.31 V and high roundtrip efficiency of 90.0% at the current density of 0.1 mA·cm2. More importantly, the hybrid Na−air battery indicates fantastic cyclability for charging and discharging due to its stable structure. Our results confirm Co−N−C materials derived from bi−MOF as an alternative to high−cost Pt/C catalyst for ORR and OER activities in metal−air batteries.

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Supplementary files

Article information


Submitted
17 Oct 2019
Accepted
27 Dec 2019
First published
03 Jan 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

Highly dispersed Co nanoparticles decorated on N−doped defective carbon nano−framework for hybrid Na−Air battery

J. Zhu, T. Qu, Y. Wu, F. Su, Y. Kang, K. Chen, Y. Yao, W. Ma, B. Yang, Y. Dai, F. Liang and D. Xue, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/C9DT04073K

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