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<p>Carbon-supported bimetallic sites show great potential in the field of oxygen reduction electrocatalysis, yet multi-scale structural engineering of carbon supports plays an important role in modulating the catalytic activity. Herein, we ingeniously synthesized an interconnected multi-dimensional porous carbon matrixs supported FeNi bimetallic catalyst (denoted by FeNi-NC/CNT) through pyrolyzing ZIF-8 precursors mixed with polystyrene (PS) microspheres as a pore-forming agent and carbon nanotubes. The optimized FeNi-NC/CNT catalyst exhibited exceptional bifunctional catalytic activity with high half-wave potential <i>E</i><sub>1/2</sub> = 0.87&#xa0;V in the oxygen reduction reaction (ORR) process and high activity in the oxygen evolution reaction (OER) with <i>E</i><sub>j=10</sub> = 1.60&#xa0;V, leading to an ultralow potential difference (730&#xa0;mV) that is much lower than that of control sample (843&#xa0;mV) without PS perforation. In practical application, the FeNi-NC/CNT based zinc-air battery achieved a peak power density of 148.6 mW cm<sup>−2</sup> and a steady operation time exceeding 150&#xa0;h, with a low potential difference of only 950&#xa0;mV. The enhanced bifunctional catalytic activity can be attributed to multi-dimensional frameworks composed of hierarchical porous carbons and conductive CNTs, provide adequate exposure to active sites and mass/electron transfer pathway, and the tuned interaction of FeNi that contributes to equilibrating the intrinsic ORR/OER bifunctional catalytic activity.</p> Graphical abstract <p></p>

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Engineering interconnected hierarchical porous carbon frameworks supported FeNi bimetallic sites for enhanced bifunctional oxygen electrocatalysis

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Yi Cheng,
  • Jiaxin Li,
  • Ying Lei,
  • Chuanlan Xu,
  • Jianying Li,
  • Yujun Si,
  • Jinlong Chen,
  • Honghui Wang,
  • Wenjing Han

摘要

Carbon-supported bimetallic sites show great potential in the field of oxygen reduction electrocatalysis, yet multi-scale structural engineering of carbon supports plays an important role in modulating the catalytic activity. Herein, we ingeniously synthesized an interconnected multi-dimensional porous carbon matrixs supported FeNi bimetallic catalyst (denoted by FeNi-NC/CNT) through pyrolyzing ZIF-8 precursors mixed with polystyrene (PS) microspheres as a pore-forming agent and carbon nanotubes. The optimized FeNi-NC/CNT catalyst exhibited exceptional bifunctional catalytic activity with high half-wave potential E1/2 = 0.87 V in the oxygen reduction reaction (ORR) process and high activity in the oxygen evolution reaction (OER) with Ej=10 = 1.60 V, leading to an ultralow potential difference (730 mV) that is much lower than that of control sample (843 mV) without PS perforation. In practical application, the FeNi-NC/CNT based zinc-air battery achieved a peak power density of 148.6 mW cm−2 and a steady operation time exceeding 150 h, with a low potential difference of only 950 mV. The enhanced bifunctional catalytic activity can be attributed to multi-dimensional frameworks composed of hierarchical porous carbons and conductive CNTs, provide adequate exposure to active sites and mass/electron transfer pathway, and the tuned interaction of FeNi that contributes to equilibrating the intrinsic ORR/OER bifunctional catalytic activity.

Graphical abstract