High-performance microbial fuel cell based on activated biomass carbon aerogel
The development of new,high-efficiency,and cheap anode materials is one of the main ways to solve the bottleneck problem of microbial fuel cells(MFCs)applications.The biomass-based carbon aerogel(CA)was prepared based on sugarcane using a simple direct carbonization method and used as an advanced anode in high-performance MFCs.The results showed that benefiting from the naturally ordered pore three-dimensional structure that ensured effective electroactivity and microbial accessible area,as well as good electrical conductivity and biocompatibility,the maximum power density of MFCs with CA-900℃ as the anode was 2.58 times of the MFCs higher than that of MFCs with two-dimensional carbon paper with the same volume.Furthermore,the activated biomass carbon aerogel(ACA)was obtained with the electrooxidation and reduction processes.The ACA-30min exhibited a higher degree of graphitization,significantly enhanced electrical conductivity,and a more optimized hierarchical pore structure.The specific surface area and pore volume of ACA-30min are 1.8 times and 2.35 times of the CA-900℃,respectively.The maximum power density and Coulombic efficiency of the ACA-30min MFCs were 1.11 times and 1.33 times of the CA-900℃ MFCs,respectively.These results will facilitate the development of green,efficient,and cost-effective three-dimensional carbon materials for MFCs.It also opens up new avenues for sewage treatment and recycling of agricultural resources.
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