Journal of Energy Chemistry ›› 2023, Vol. 76 ›› Issue (1): 470-478.DOI: 10.1016/j.jechem.2022.09.031

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Schiff-base polymer derived FeCo-N-doped porous carbon flowers as bifunctional oxygen electrocatalyst for long-life rechargeable zinc-air batteries

Yusong Denga,1, Jiahui Zhenga,1, Bei Liua, Huaming Lia,b,*, Mei Yanga,b,*, Zhiyu Wangc,*   

  1. aCollege of Chemistry, Xiangtan University, Xiangtan 411105, Hunan, China;
    bKey Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Key Laboratory of Polymeric Materials & Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province, Xiangtan University, Xiangtan 411105, Hunan, China;
    cState Key Lab of Fine Chemicals, Liaoning Key Lab for Energy Materials and Chemical Engineering, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2022-06-19 Revised:2022-09-14 Accepted:2022-09-17 Published:2023-01-10
  • Contact: *E-mail addresses: lihuaming@xtu.edu.cn (H. Li), yangmei@xtu.edu.cn (M. Yang), zywang@dlut.edu.cn (Z. Wang).
  • About author:1These authors contributed equally to this work.

Abstract: Rational design and exploration of low-cost and robust bifunctional oxygen electrocatalysts are vitally important for developing high-performance zinc-air batteries (ZABs). Herein, we reported a facile yet cost-efficient approach to construct a bifunctional oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) electrocatalyst composed of N-doped porous carbon nanosheet flowers decorated with FeCo nanoparticles (FeCo/N-CF). Rational design of this catalyst is achieved by designing Schiff-base polymer with unique molecular structure via hydrogen bonding of cyanuramide and terephthalaldehyde polycondensate in the presence of metal cations. It exhibits excellent activity and stability for electrocatalysis of ORR/OER, enabling ZAB with a high peak power density of 172 mW cm-2 and a large specific capacity of 811 mA h g-1Zn at large current. The rechargeable ZAB demonstrates excellent durability for 1000 h with slight voltage decay, far outperforming a couple of precious Pt/Ir-based catalysts. Density functional theory (DFT) calculations reveal that high activity of bimetallic FeCo stems from enhanced O2 and OH- adsorption and accelerated O2 dissociation by OO bond activation.

Key words: Rechargeable zinc-air batteries, Oxygen electrocatalyst, Schiff-base polymer, Bimetallic FeCo, N-doped porous carbon