Hierarchically Porous and Defective Carbon Fiber Cathode for Efficient Zn-Air Batteries and Microbial Fuel Cells

Daohao Li , Xiaojing Long , Yaqian Wu , Huijie Hou , Xueyao Wang , Jun Ren , Lijie Zhang , Dongjiang Yang , Yanzhi Xia

Advanced Fiber Materials ›› 2022, Vol. 4 ›› Issue (4) : 795 -806.

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Advanced Fiber Materials ›› 2022, Vol. 4 ›› Issue (4) : 795 -806. DOI: 10.1007/s42765-022-00139-6
Research Article

Hierarchically Porous and Defective Carbon Fiber Cathode for Efficient Zn-Air Batteries and Microbial Fuel Cells

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Abstract

Developing low-cost, efficient oxygen reduction reaction (ORR) catalysts to replace Pt-based materials is urgently required for the application of Zn-air batteries (ZABs) and microbial fuel cells (MFCs). In this work, meso-microporous carbon fibers with tunable defect density were synthesized by carrageenan fibers. A highly defective carbon fiber (HDCFs) was produced which exhibited an outstanding ORR catalytic activity, reaching to the half-wave potential of 0.841 and 0.44 V in alkaline and neutral electrolytes, respectively. These HDCFs can also act as highly efficient air cathodes for ZABs (delivered potential of 0.69 V and power density of 220 mW cm–2 at 300 mA cm–2) and MFCs (high power density of 69.7 mW cm–2). Simulation by the density functional theory indicated that a high density of defections in a carbon based framework can remarkably modulate the electrical properties. For instance the charge entrapments in the carbon active sites may reduce the energy barrier of ORR.

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Daohao Li, Xiaojing Long, Yaqian Wu, Huijie Hou, Xueyao Wang, Jun Ren, Lijie Zhang, Dongjiang Yang, Yanzhi Xia. Hierarchically Porous and Defective Carbon Fiber Cathode for Efficient Zn-Air Batteries and Microbial Fuel Cells. Advanced Fiber Materials, 2022, 4(4): 795-806 DOI:10.1007/s42765-022-00139-6

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National Natural Science Foundation of China(51672143)

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