催化作用
碳化
微生物燃料电池
化学工程
材料科学
多孔性
钴
阴极
生物炭
氮气
碳纤维
吸附
法拉第效率
比表面积
甲醇
氧气
化学
电极
冶金
复合材料
电化学
阳极
有机化学
热解
物理化学
工程类
复合数
作者
Jianting Liu,Changshun Chu,Liling Wei,Jiejie Feng,Jianquan Shen
标识
DOI:10.1016/j.bios.2022.114926
摘要
Developing low-cost and high-efficiency oxygen reduction reaction (ORR) catalysts is crucial to the commercial application of microbial fuel cell (MFC). Herein, Fe/Co-decorated nitrogen-rich three-dimensional (3D) layer-stacked porous biochar (Fe/Co-NC-x) have been synthesized from silk gel through secondary carbonization of activated carbons which firstly adsorbed metal ions. The multilayer porous structure of Fe/Co-NC-3 contributes to construction of high specific surface area (576 m2 g-1), large pore volume (1.27 cm3 g-1) and many defect structure (ID/IG = 1.004). As expected, with Fe/Co synergistic effect, Fe/Co-NC-3 exhibits excellent ORR performance through 4e- pathway with good methanol resistance. In addition, the performance of MFC using Fe/Co-NC-3 as air-cathode catalyst is more prominent with higher maximum power density (1059.62 ± 30.00 mW m-2) compared to that using NC (668.19 ± 9.84 mW m-2) and commercial Pt/C catalyst (957.33 ± 10.50 mW m-2). Therefore, Fe/Co-NC-3 should be a prospective catalyst in the practical application of fuel cells and other energy devices.
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