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Co single-atoms on ultrathin N-doped porous carbon via a biomass complexation strategy for high performance metal–air batteries

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Abstract

The sluggish kinetics of air electrodes largely limits the practical applications of metal–air batteries. At present, preparing single-atom catalysts confined in ultrathin N-doped porous carbon (NPC) with a high surface area remains a challenge. Herein, a facile strategy by complexation of biomass and metal ions combined with the gas-foaming method was used to synthesize substantial Co–N4 active sites on ultrathin NPC with a super-high specific surface area of 1977.9 m2 g−1. The catalyst owns brilliant oxygen reduction reaction properties with higher half-wave potential of 0.863 V and faster kinetics process (68.3 mV dec−1) than those of Pt/C (0.856 V and 80.46 mV dec−1, respectively). Remarkably, it exhibits distinguished reversibility with a high initial cycle efficiency of 60.8% and satisfactory stability when used in Zn–air batteries. Moreover, the assembled Al–air battery displays preeminent discharge performance with ultrahigh power density (494 mW cm−2) and energy density (2387 W h kg−1) at 200 mA cm−2. This study opens a new avenue to fully utilize biomass for constructing Co single-atom catalysts for metal–air batteries.

Graphical abstract: Co single-atoms on ultrathin N-doped porous carbon via a biomass complexation strategy for high performance metal–air batteries

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Article information


Submitted
05 Nov 2019
Accepted
14 Dec 2019
First published
17 Dec 2019

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Co single-atoms on ultrathin N-doped porous carbon via a biomass complexation strategy for high performance metal–air batteries

Y. Wang, B. Yu, K. Liu, X. Yang, M. Liu, T. Chan, X. Qiu, J. Li and W. Li, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA12171D

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