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开发高性能的H_2O2电还原催化剂对于以H_2O2为氧化剂的燃料电池系统至关重要。碳载体对于催化活性位点的分散与反应过程的传质有重要作用。本文以椴木衍生炭为载体，负载单原子Fe-N-C催化剂，制备了自支撑电极(Fe-BWC)，用于催化H_2O2电还原反应，研究了Fe前驱体种类、浓度以及热解温度等对电极催化活性的影响。得益于椴木炭的规则孔道结构，当电解液采用流通模式时，Fe-BWC电极表现出比流经模式更高的催化性能。电化学测试和物理结构表征证明，电极在催化H_2O2反应中表现出良好的电化学稳定性。以Fe-BWC为阴极组装了Mg-H_2O2燃料电池，其功率密度与Pt/C为阴极催化剂的电池相当。通过优化H_2O2和硫酸电解液浓度，电池表现出超过70 mW/cm2的峰值功率密度。在1 V恒压放电测试中，电池可以稳定运行20 h以上。
Abstract：The development of high-performance H_2O2 electroreduction catalysts is crucial for fuel cells using H_2O2 as oxidant. Carbon support plays an important role in the dispersion of catalytic active sites and mass transfer in the reaction process. In this paper,a self-supporting electrode(Fe-BWC) was prepared by loading single-atom Fe-N-C catalyst on basswood-derived carbon to catalyze the electroreduction of H_2O2. The effects of Fe precursor type,concentration and pyrolysis temperature on the catalytic activity of the electrode were studied.In comparison with electrolyte flow-by mode, the Fe-BWC electrode exhibits higher catalytic performance when the electrolyte flowthrough mode is adopted due to the regular pore structure of basswood-derived carbon. Electrochemical tests and physical structure characterization prove that the electrode exhibits good electrochemical stability in catalyzing H2 O2 reaction. Mg-H_2O2 fuel cell was assembled with Fe-BWC as cathode,and its power density was comparable to that of the fuel cell with Pt/C as cathode catalyst. By optimizing the concentration of H_2O2 and sulfuric acid electrolyte,t he fuel cell exhibits a peak power density of more than 70 mW/cm2. During the constant voltage testing at 1 V, the fuel cell can run stably for more than 20 hours.
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基本信息:
DOI：10.13774/j.cnki.kjtb.2025.09.004
中图分类号:TQ426;TM911.4
引用信息:
[1]管懿婷,张笑涵,杨昆,等.椴木衍生炭负载Fe-N-C自支撑电极用于催化过氧化氢电还原反应的研究[J].科技通报,2025,41(09):50-57.DOI:10.13774/j.cnki.kjtb.2025.09.004.
基金信息:
中央高校基本科研业务费专项资金资助项目（2662024HXPY001）