Biomass carbon with defective structures as effective ORR catalyst for DMFC

文献类型： 外文期刊

第一作者： Taxi, Dilihumaer

作者： Taxi, Dilihumaer;Shao, Shujuan;Maimaitiyiming, Xieraili;Sawut, Amatjan;Lin, He;Tursun, Mamutjan;Kuerban, Zaituniguli

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关键词： Biomass carbon; Single-atom electrocatalysts; Iron and nitrogen doping; DFT calculations

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 356 卷

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收录情况： SCI

摘要： Oxygen reduction reaction (ORR), as an important reaction carried out on the cathode of direct methanol fuel cells (DMFC), directly affects the performance of the cell. Previous experimental studies have shown that there are some interactions between the defect structure and N doping to promote the ORR performance of the catalysts. In this work, the binder was first utilized to reduce the lignin content in the cotton straw (CS) system, thereby increasing the defective structure of the carbon substrate. Here, we obtained 5C-NP-Fe catalysts by increasing the defectivity of the carbon substrate through binder. The coordination environment surrounding the Fe-N-4 sites is optimized by the synergistic action of the N and P atoms and the faulty structure, as shown by DFT theoretical calculations. In alkaline medium, half-wave potentials as high as 0.88 V in the three-electrode system and a peak power density of 10.8 mW cm(-2) in a direct methanol fuel cell at 60degree celsius. Compared to a 20 wt% commercial Pt/C catalyst (0.84 V, 7.5 mW cm(-2)), 5C-NP-Fe showed good ORR activity. The binder modification strategy provides a simple and green approach to the structural optimization of biomass-based catalysts.

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