Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 410-417.DOI: 10.1016/j.jechem.2022.12.026

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One dimensional nickel phosphide polymorphic heterostructure as carbon-free functional support loading single-atom iridium for promoted electrocatalytic water oxidation

Rashid Mehmooda,b,1, Guifa Longc,1, Wenjun Fana, Mingrun Lia, Lifang Liua,b, Fuxiang Zhanga,*   

  1. aStateKey Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China;
    bCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    cGuangxiKey Laboratory of Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530008, Guangxi, China
  • Received:2022-08-07 Revised:2022-12-20 Accepted:2022-12-21 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail address: fxzhang@dicp.ac.cn (F. Zhang).
  • About author:1These authors contributed equally to this work.

Abstract: Although conducting materials such as carbon nanotube and carbon fiber paper (CFP) have been exten-sively employed as support of electrocatalytic active sites, most of them are of poor catalytic functionality by themselves and undesirable stability during strong acid/alkaline environments or oxidation process. Here we report a novel one-dimensional (1D) nickel phosphide polymorphic heterostructure (denoted as NPPH) to work as one effective carbon-free functional support for loading of single-atom Ir water oxi-dation electrocatalyst. Specifically, the NPPH composed of both Ni12P5 and Ni2P phases is not only active for robust alkaline water oxidation but also is of good stability and hydrophilicity for favorable loading of single-atom dispersed iridium. The NPPH supported single-atom Ir electrocatalyst (Ir/NPPH) is found to exhibit remarkably superior water oxidation activity with respect to the NPPH itself or CFP supported single-atom Ir catalyst (Ir/CFP), demonstrating the synergetic promotion effect between NPPH and single-atom Ir catalyst. Furthermore, the NPPH supported single-atom Ir catalyst can bear alkaline water oxidation for over 120 h at current density of 50 mA cm-2. The NPPH developed here is expected as func-tional support to composite with other water oxidation catalysts, as may be an alternative strategy of developing highly efficient carbon-free electrocatalysts.

Key words: Oxygen evolution reaction, Single atom catalyst, Nickel phosphide, Heterostructure, One-dimensional