催化作用
介孔材料
微生物燃料电池
色散(光学)
多孔性
化学工程
阴极
扫描电子显微镜
化学
氧还原反应
材料科学
纳米技术
电极
物理化学
电化学
有机化学
复合材料
工程类
物理
光学
阳极
作者
Wuli Han,Chuanhua Li,Yu Jiang,Zhaowu Ma,Yan Zhang,Xuemin Yan,Xiaofeng Zheng
标识
DOI:10.1016/j.jallcom.2020.156994
摘要
An efficient catalyst (Fe/S–N/C) possessing abundant ordered mesoporous was synthesized via a facile strategy, in which the active Fe-Nx and C–S–C species exhibited atomic dispersion. Attributing to its well-developed porosity, the total pore volume and specific surface area of Fe/S–N/C catalyst reach 0.556 cm3 g−1 and 980.9 m2 g−1 respectively. Electron microscopy results reveal the uniform dispersion of atomic Fe-Nx and C–S–C in this catalyst, which has inherited a polyhedral morphology derived from ZIF-8. X-ray spectroscopy measurements further validate that the Fe/S–N/C composite can provide abundant and highly efficient active sites for ORR. The atomic ratio of nitrogen is 4.28%, with high relative concentrations of the active pyridinic N and Fe-Nx. Furthermore, the Fe/S–N/C catalysts demonstrate significant ORR activity in the practical application of MFC devices. Based on a high open circuit potential (0.674 V) and maximum power density (1436.42 mW m−2) of the MFC device which uses the Fe/S–N/C as air-cathode catalyst, the Fe/S–N/C displays better catalytic activity than commercial 20% Pt/C catalyst. This investigation provides a new strategy to design an effective, low-cost ORR catalyst for MFC devices.
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