High-efficiency oxygen electrocatalyst for Zn-air batteries on CoMn alloy encapsulated in N-doped carbon architectures

Author:

Zhou Wenshu123,Liu Yanyan14ORCID,Wu Dichao1,Liu Shuling4,Zhang Pengxiang4ORCID,Zhang Gaoyue1,Sun Kang1,Jiang Jianchun12ORCID

Affiliation:

1. Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry (CAF), National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory of Forest Chemical Engineering, SFA 1 , Nanjing 210042, Jiangsu Province, China

2. Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University 2 , Nanjing 210042, China

3. College of Food Science and Engineering, Nanjing University of Finance and Economics 3 , Nanjing 210023, China

4. College of Science, Henan Agricultural University 4 , Zhengzhou 450002, China

Abstract

A low-cost efficient electrocatalyst for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is urgently required for the commercialization of Zn-air batteries. Herein, CoMn nanoalloys encapsulated in nitrogen-doped hollow carbon architectures (CoMn@NHC) as dual electrocatalysts for Zn-air batteries were developed successfully. The obtained CoMn@NHC nanohybrid expresses excellent electrocatalytic performances for ORR (E1/2 = 0.87 V) and OER (Ei=10 = 1.51 V). More encouragingly, a homemade aqueous Zn-air battery using CoMn@NHC catalyst delivers a larger peak power density of 92.3 mW cm−2 and excellent stability of nearly 300 h, outperforming the commercial Pt/C + RuO2. The remarkable electrocatalytic performances are owing to the unique microstructure and the synergistic effect between CoMn alloy and N-doped carbon substrate. This study opens a new way for designing high-efficient bifunctional electrocatalysts for application in renewable energy facilities.

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

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