文献类型： 外文期刊

作者： Zhao, Xiaoting ¹ ; Maimaitiyiming, Xieraili ¹ ; Sawut, Amatjan ¹ ; Kuerban, Zaituniguli ² ;

作者机构： 1.Xinjiang Univ, Coll Chem, State Key Lab Chem & Utilizat Carbon Based Energy, Urumqi 830046, Xinjiang, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Grain Crops, Urumqi 830091, Xinjiang, Peoples R China

关键词： Oxygen reduction reaction; Biomass; Monoatomic catalysts; Binder; DMFC

期刊名称：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY （ 影响因子：8.1； 五年影响因子：7.3 ）

ISSN： 0360-3199

年卷期： 2024 年 77 卷

页码：

收录情况： SCI

摘要： Direct Methanol fuel cells (DMFC) have been limited in their utilization due to their slow cathodic oxygen reduction reaction (ORR) kinetics and the expensive cost of commercial Pt/C catalysts. It is critical to design an oxygen reduction process with high-efficiency catalysts. An approach for modulating the ratio of cellulose, hemicellulose, and lignin in the wheat stalk (WS)/wheat stalk binder (WS binder) precursor materials is proposed in this work. WS binder from alkalization and hydrothermal treatment was added to the WS to change the structure and shape of WS-based carbon materials by varying the ratios, which increased the ORR catalytic activity. The half-wave potential (E1/2) of the produced carbon material (15 wt% N/C (WS)) is 0.76 V, which was enhanced by 80 mV by adjusting the ratio of the WS/WS binder compared to 0 wt% N/C(WS). The E1/2 of 15 wt % Fe-N/C (WS) (0.85 V) was greater than that of commercial Pt/C (0.84 V). Besides, its catalytic oxygen reduction process was close to the 4-electron transfer pathway and had good methanol tolerance. The power density obtained with a cathode catalyst of 15 wt% Fe-N/C (WS) for DMFC was 1.39 mW cm-2 at 30 degrees C and 3.33 mW cm-2 at 60 degrees C. At different temperatures, the power densities were 1.59 and 1.54 times greater than those of commercial Pt/C catalysts, respectively.