Impregnation of ionic liquid into porous Fe-N-C electrocatalyst to improve electrode kinetics and mass transport for polymer electrolyte fuel cells

IF 15.7 1区化学 Q1 CHEMISTRY, APPLIED

Chinese Journal of Catalysis Pub Date : 2025-05-01 DOI:10.1016/S1872-2067(25)64654-7

Siming Li , Enyang Sun , Pengfei Wei , Wei Zhao , Suizhu Pei , Ying Chen , Jie Yang , Huili Chen , Xi Yin , Min Wang , Yawei Li

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引用次数: 0

Abstract

Developing efficient and stable non-precious metal catalysts is essential for replacing platinum-based catalysts in polymer electrolyte membrane fuel cells (PEMFCs). The transition metal and nitrogen co-doped carbon electrocatalyst (M-N-C) is considered an effective alternative to precious metal catalysts. However, its relatively poor performance in acidic environments has always been a problem plaguing its practical application in PEMFCs. This study presents a sequential deposition methodology for constructing a composite catalytic system of Fe-N-C and ionic liquid (IL), which exhibits improved performance at both half-cell and membrane electrode assembly scales. The presence of IL significantly inhibits H₂O₂ production, preferentially promoting the 4e^– O₂ reduction reaction, resulting in improved electrocatalytic activity and stability. Additionally, the enhanced PEMFC performance of IL containing electrodes is a direct result of the improved ionic and reactant accessibility of the pore confined Fe-N-C catalysts where the IL minimizes local resistive transport losses. This study establishes a strategic foundation for the practical utilization of non-precious metal catalysts in PEMFCs and other energy converting technologies.

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离子液体浸渍多孔Fe-N-C电催化剂以改善聚合物电解质燃料电池的电极动力学和质量传递

开发高效、稳定的非贵金属催化剂是取代聚合物电解质膜燃料电池（pemfc）中铂基催化剂的关键。过渡金属与氮共掺杂碳电催化剂（M-N-C）被认为是贵金属催化剂的有效替代品。然而，其在酸性环境中较差的性能一直是困扰其在pemfc中实际应用的一个问题。本研究提出了一种顺序沉积方法来构建Fe-N-C和离子液体（IL）的复合催化体系，该体系在半电池和膜电极组装尺度上都表现出更好的性能。IL的存在显著抑制H2O2的生成，优先促进4e - O2还原反应，从而提高电催化活性和稳定性。此外，含有IL的电极的PEMFC性能的增强是孔隙受限Fe-N-C催化剂的离子和反应物可及性的改善的直接结果，其中IL使局部电阻输运损失最小化。该研究为非贵金属催化剂在pemfc和其他能源转换技术中的实际应用奠定了战略基础。

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来源期刊

Chinese Journal of Catalysis 工程技术-工程：化工

CiteScore

25.80

自引率

10.30%

发文量

235

审稿时长

1.2 months

期刊介绍： The journal covers a broad scope, encompassing new trends in catalysis for applications in energy production, environmental protection, and the preparation of materials, petroleum chemicals, and fine chemicals. It explores the scientific foundation for preparing and activating catalysts of commercial interest, emphasizing representative models.The focus includes spectroscopic methods for structural characterization, especially in situ techniques, as well as new theoretical methods with practical impact in catalysis and catalytic reactions.The journal delves into the relationship between homogeneous and heterogeneous catalysis and includes theoretical studies on the structure and reactivity of catalysts.Additionally, contributions on photocatalysis, biocatalysis, surface science, and catalysis-related chemical kinetics are welcomed.