J. Mater. Sci. Technol. ›› 2023, Vol. 135: 26-33.DOI: 10.1016/j.jmst.2022.07.005

• Research Article • Previous Articles     Next Articles

Synergistic coupling of Ni3ZnC0.7 decorated with homogeneous multimetal CoNiCuFe nitrogen-codoped carbon matrix as high-entropy catalysts for efficient overall water splitting

Xi Dua,b,*, Leilei Yina,c, WenJun Zhanga,b, Maliang Zhanga,b, Kunmei Sua,c,*, Zhenhuan Lia,b   

  1. aState Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China;
    bTianjin Key Laboratory of Advanced Fibers and Energy Storage, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China;
    cSchool of Chemistry and Chemical Engineering, Tiangong University, Tianjin 300387, China
  • Received:2021-11-06 Revised:2022-01-29 Accepted:2022-07-10 Published:2023-02-01 Online:2022-08-02
  • Contact: *State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China. E-mail addresses: duxi@tiangong.edu.cn (X. Du), sukunmei@tiangong.edu.cn (K. Su)

Abstract: Due to unique electrical properties and high catalytic efficiency, transition metal nitrogen-codoped carbide (TM-N-C) has attracted tremendous interest as a multifunctional electrocatalyst for water splitting. Unlike traditional single-source modification, herein a novel pomegranate-like high-entropy (HE) electrocatalyst of Ni3ZnC0.7 decorated with homogeneous multimetal (Fe, Co, Cu, and Ni) nitrogen-codoped carbon matrix (Ni3ZnC0.7@CoNiCuFe-NC) is reported. It can be implemented by the simple thermal annealing method of multimetal codoped zeolitic imidazolate framework (ZIF). Benefiting from the synergistic effects of plentiful TM-N-C species, template effect of ZIF and distinct nanoporous structure, HE electrocatalyst Ni3ZnC0.7@CoNiCuFe-NC exhibits outstanding electrocatalytic performance. When applied in strong alkaline electrolyte (1.0 M KOH), the overpotentials of Ni3ZnC0.7@CoNiCuFe-NC present as low as 202 and 97 mV for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) at 10 mA cm-2 current density. Surprisingly as a bifunctional electrode, it can achieve the low cell voltage of 1.53 V at 10 m cm-2 current density for overall water splitting, which is comparable to conventional IrO2||Pt/C electrode and superior to the recently reported analogous bifunctional catalysts. Thus, the work proposes the direction for the rational design of homogeneous distribution of TM-N-C material for water splitting in the green hydrogen energy industry.

Key words: Homogeneous multimetal, Zeolitic imidazolate framework, High-entropy electrocatalyst, Synergistic effect, Overall water splitting