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<p>The development of efficient transition metal oxygen reduction reaction (ORR) catalysts as substitutes for platinum-based catalysts has served as a key strategy in advancing the commercialization of fuel cells. Herein, an effective Fe-N-C catalyst for the ORR was fabricated with hemin as the iron source of Fe-N<sub><i>X</i></sub> active sites through a simple precipitation-pyrolysis method. With the aid of hemin, the leaf-like ZIF-8 synthesized in an aqueous environment can be driven to transform into a stable three-dimensional dodecahedral structure, resulting in a substantial increase in the yield of Fe-N-C materials. Meanwhile, the influence of hemin loading in the precursors and pyrolysis temperature on the oxygen reduction catalytic activity of the final product Fe-N-C was investigated. Concretely, the optimal Fe<sub>100</sub>-N-C<sub>950</sub> displays an onset potential of 1.054 V (vs. RHE) and a half-wave potential of 0.847 V (vs. RHE). Additionally, the direct ethanol fuel cell (DEFC) with Fe<sub>100</sub>-N-C<sub>950</sub> as the cathode catalyst demonstrated a higher power density than the one with the commercial Pt-C catalyst.</p>

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High yielding hierarchical porous Fe-N-C with enriched effective active sites: Promoting oxygen reduction reaction electrocatalytic kinetics

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Zexuan Du,
  • Mengfan Zhang,
  • Wenjuan Zhang,
  • Bingye Song,
  • Qianzhi Gou,
  • Ran Gao,
  • Angui Li,
  • Xianda Sun

摘要

The development of efficient transition metal oxygen reduction reaction (ORR) catalysts as substitutes for platinum-based catalysts has served as a key strategy in advancing the commercialization of fuel cells. Herein, an effective Fe-N-C catalyst for the ORR was fabricated with hemin as the iron source of Fe-NX active sites through a simple precipitation-pyrolysis method. With the aid of hemin, the leaf-like ZIF-8 synthesized in an aqueous environment can be driven to transform into a stable three-dimensional dodecahedral structure, resulting in a substantial increase in the yield of Fe-N-C materials. Meanwhile, the influence of hemin loading in the precursors and pyrolysis temperature on the oxygen reduction catalytic activity of the final product Fe-N-C was investigated. Concretely, the optimal Fe100-N-C950 displays an onset potential of 1.054 V (vs. RHE) and a half-wave potential of 0.847 V (vs. RHE). Additionally, the direct ethanol fuel cell (DEFC) with Fe100-N-C950 as the cathode catalyst demonstrated a higher power density than the one with the commercial Pt-C catalyst.