Journal of Energy Chemistry ›› 2023, Vol. 86 ›› Issue (11): 41-53.DOI: 10.1016/j.jechem.2023.07.009

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Conjugated polymerized bimetallic phthalocyanine based electrocatalyst with Fe-N4/Co-N4 dual-sites synergistic effect for zinc-air battery

Shuaifeng Wang, Zhongfang Li*, Wenjie Duan, Peng Sun, Jigang Wang, Qiang Liu, Lei Zhang, Yanqiong Zhuang   

  1. School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, China
  • Received:2023-03-24 Revised:2023-07-07 Accepted:2023-07-08 Online:2023-11-15 Published:2023-11-07
  • Contact: *E-mail address: zhfli@sdut.edu.cn (Z. Li).

Abstract: The bifunctional oxygen catalyst is essential for zinc-air batteries (ZABs). Here, an efficient bifunctional oxygen catalyst, PPcFeCo/3D-G, is obtained through π-π interaction between the conjugated polymerized iron-cobalt phthalocyanine (PPcFeCo) with excellent thermal stability and three-dimensional graphene (3D-G). The bimetallic synergistic effect of PPcFeCo, verified by DFT (Density functional theory) calculation, and π-π interactions enhances the catalytic activity and durability of the PPcFeCo/3D-G. Regarding electrochemical performance, the PPcFeCo/3D-G with a high electron transfer number (3.98, @0.768 V vs. RHE) has excellent half-wave potential (E1/2=0.890 V vs. RHE) and exhibits outstanding reversibility (ΔE=0.700 V, ΔE=Ej=10-E1/2). The liquid ZAB (LZAB) employed PPcFeCo/3D-G displays a high power density (222 mW cm-2), a specific capacity (792 mA h g-1), and excellent durability (120 h). This work has guiding significance for the preparation of high-efficiency bifunctional catalysts.

Key words: Zn-air battery, Bifunctional oxygen catalysts, Polymerized iron-cobalt phthalocyanine, Bimetallic synergy, π-π interaction