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CoSe2/Co nanoheteroparticles embedded in Co, N co-doped carbon nanopolyhedra/nanotube as efficient oxygen bifunction electrocatalyst for Zn-air batteries

Abstract

Transition metal selenide-based materials have been demonstrated as one of the promising electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), yet the design of high efficient and stable electro-catalyst still remains a long and arduous challenge. Herein, a predesigned hybrid Zn/Co zeolitic imidazole framework is used to fabricate CoSe2/Co nanoheteroparticles embedded within hierarchically porous Co, N co-doped carbonnanopolyhedra/nanotube (CoSe2/Co@NC-CNTs) through facile one take measure of controlled carbonization and selenization procedures.As expected, the optimized CoSe2/Co@NC-CNT-1 displays outstandingelectrocatalytic performance in ORR and OER, with an onset potential of 0.95 V vs. RHE, a half-wave potential of 0.84 V vs. RHE for ORR and a potential of 1.69V vs. RHE for OER at 10 mA cm-2. It also exhibits excellent long-term stability and methanol resistance ability, which are superior to commercial 20 wt% Pt/C catalyst. Notably, the assembled Zn-Air battery with CoSe2/Co@NC-CNT-1 shows a low charge-discharge voltage gap (0.696 V at 10 mA cm-2) and high peak power density (100.28 mW cm-2) with long-term cycling stability. These superior performances can be ascribed to the synergistic effects of the highly active CoSe2/Co nanoheterostructure, hierarchically porous structure with large surface area, high electrical conductivity and uniformdoping of Co and N.

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Supplementary files

Article information


Submitted
03 Jan 2020
Accepted
23 Jun 2020
First published
30 Jun 2020

Sustainable Energy Fuels, 2020, Accepted Manuscript
Article type
Paper

CoSe2/Co nanoheteroparticles embedded in Co, N co-doped carbon nanopolyhedra/nanotube as efficient oxygen bifunction electrocatalyst for Zn-air batteries

J. Zou, Q. Luo, H. Wu, S. Liu, T. Lan, Y. Yao, M. A. Z. G. SIAL, F. Zhao, Q. Zhang and X. Zeng, Sustainable Energy Fuels, 2020, Accepted Manuscript , DOI: 10.1039/D0SE00019A

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