J. Mater. Sci. Technol. ›› 2025, Vol. 222: 142-151.DOI: 10.1016/j.jmst.2024.09.043

• Research Article • Previous Articles     Next Articles

Coordination polymer derived transition metal phosphide/carbon composites for bifunctional oxygen electrocatalyst

Yue Dua, Zhiyi Zhonga, Lina Zhoua,*, Wenxue Chena, Zhixian Shia, Pan Songa, Yifeng Liub, Yao Yaoc, Yisi Liua,*, Shixue Doud, Yao Xiaob,e,*   

  1. aHubei Key Laboratory of Photoelectric Materials and Devices & School of Material Science and Engineering, Hubei Normal University, Huangshi 435002, China;
    bCollege of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China;
    cState Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, China;
    dInstitute of Energy Materials Science (IEMS), University of Shanghai for Science and Technology, Shanghai 200093, China;
    eKey Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China
  • Received:2024-07-01 Revised:2024-09-18 Accepted:2024-09-18 Published:2025-07-01 Online:2024-10-24
  • Contact: * E-mail addresses: zhlina@hbnu.edu.cn (L. Zhou), yliu88@hbnu.edu.cn (Y. Liu), xiaoyao@wzu.edu.cn (Y. Xiao)

Abstract: Developing nonprecious electrocatalysts with bifunctional performances for oxygen reduction (ORR) and evolution reactions (OER) remains a crucial challenge in rechargeable Zn-air batteries (RZABs). In this study, we report the synthesis of a three-dimensional (3D) porous N, P-doped carbon-wrapped cobalt phosphide composite (Co2P@3DNPC) via direct calcination of a novel organic/inorganic porous coordination polymer by an in-situ phosphating strategy. DFT calculations demonstrate the intricate interactions occurring during the PEI-directed grinding self-assembly process among Co2+, phytic acid (PA), and polyethylenimine (PEI). Specifically, Co2+ ions initially adsorb onto PEI molecules before integrating with PA to form a 3D coordination polymer matrix. As-fabricated Co2P@3DNPC composite exhibits impressive ORR/OER bifunctional performances, with a half-wave potential of 0.78 V and an overpotential of 1.71 V, respectively. Its bifunctional activities enable a power density of 148.5 mW cm-2 in rechargeable ZABs, with remarkable stability (> 480 h) during a discharge-charge cycle. The interconnected porous structure and embedded Co2P nanoparticles optimize the electrode-electrolyte interfacial contact, boosting energy density and cycle life of as-assembled ZABs. This innovative approach paves the way for efficient, cost-effective production of bifunctional electrocatalysts for RZABs.

Key words: Transition metal phosphides, Bifunctional electrocatalyst, Coordination polymer, Three-dimensional porous carbon, Rechargeable Zn-air battery