氮氟共掺杂多孔碳作为微生物燃料电池阴极催化剂的性能研究

Performance of nitrogen and fluorine co-doped porous carbon as cathode catalysts for microbial fuel cells

微生物燃料电池(MFCs)是一种通过微生物的代谢作用将废水中有机物蕴含的化学能直接转化为电能的绿色技术。以合成低成本、高活性的阴极催化剂为目标,利用废弃生物质为碳源,以氟化铵为氮、氟源,以KOH为活化剂,制备出氮氟共掺杂的无金属多孔碳催化剂,从而提高MFCs阴极的氧还原反应(ORR)活性。在KOH∶C=2∶1时,所得碳材料的比表面积为648.7 m^2/g;当其作为MFCs阴极催化剂时,最大功率密度可达到1 002.8 mW/m^2,电子转移内阻为26Ω,性能均优于商业Pt/C。结果说明所得碳材料的ORR催化性能良好、所用原料环境友好,为实现MFCs阴极催化剂的低成本制备提供新的参考。

Microbial fuel cells(MFCs)are green technologies that use microorganisms to directly convert the chemical energy of organic matter in wastewater into electrical energy through metabolism.In order to synthesize the cathode catalyst with low cost and high activity,waste biomass is used as carbon source to prepare N,F co-doped metal-free porous carbon-based materials with KOH as activator and ammonium fluoride as N,F sources.The main aim of this study is to improve the oxygen reduction reaction(ORR)activity of MFCs cathode catalyst.By using the carbonization method,the specific surface area of metal-free porous carbon-based materials is 648.7 m^2/g when KOH∶C is 2∶1.When it is used as the cathode catalyst in MFCs,the maximum power density and the electron transfer internal resistance are 1 002.8 mW/m^2 and 26Ω,respectively.The overall performance of metal-free porous carbon-based materials(KOH∶C of 2∶1)is higher than that of commercial Pt/C.The ORR performance of this material is promising and the raw material is ecologically friendly,which can provide a new reference for realizing the low-cost preparation of MFCs cathode catalyst.