Enhanced FeNi nanoparticle-encapsulated carbon-graphite shells from sorghum straw and binder for efficient bifunctional oxygen electrocatalysts in DMFC and rechargeable zinc-air battery

文献类型： 外文期刊

第一作者： Yuan, Siqiong

作者： Yuan, Siqiong;Maimaitiyiming, Xieraili;Kuerban, Zaituniguli

作者机构：

关键词： ORR; OER; Biomass; FeNi nanoparticles; DMFC; ZAB

期刊名称：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY （ 影响因子：8.3； 五年影响因子：7.7 ）

ISSN： 0360-3199

年卷期： 2025 年 162 卷

页码：

收录情况： SCI

摘要： In this study, the binder (SS binder) is prepared by removing hemicellulose and lignin from sorghum straw (SS). The precursor (5 wt% SS), made by adding 5 wt% binder, is carbonized to form a defective carbon (5SS) which has a half-wave potential(E1/2) 40 mV higher than that of the pristine carbon (0SS). The optimized defective porous carbon catalyst (FeNi@N-5SS) exhibits an abundance of defects conducive to oxygen reduction reaction (ORR) and oxygen reduction reaction (OER) activities, displaying a rich 3D hierarchical porous structure as well as good electrical conductance. The catalytic performance of FeNi@N-5SS (E1/2 = 0.874 V vs. RHE, Ej=10 mA cm = 315 mV) is comparable to the catalytic performance of Pt/C (E1/2 = 0.854 V vs. RHE) and RuO2 (Ej=10 mA cm 323 mV). The favorable ORR/OER activity of FeNi@N-5SS enables its rechargeable zinc-air battery (ZAB) to possess a high power density of 211.51 mW cm-2 and exhibit long cycle stability, lasting for 350 h at a current density of 5.0 mA cm-2. Density functional theory (DFT) calculations show that the synergetic effect between binder-modified defective carbon and N-atom dopant/captured Fe-Ni alloy nanoparticles leads to excellent bifunctional activity in the FeNi@N-5SS.

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