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为研究空气阴极微生物燃料电池(Air-Cathode Microbial Fuel Cell,ACMFC)阴极结构中碳基层碳粉粒径对ACMFC产电性能的影响,制备了5种不同碳粉粒径(10 000目、8 000目、6 000目、3 000目和100 nm)的碳基层.实验结果表明,碳粉粒径对ACMFC产电性能的影响较大,其中碳粉粒径为10 000目的碳基层性能最好,最大功率密度约为647.0 mW·m-2(接近于常规ACMFC的最大功率密度),比采用其他四种碳基层的ACMFC的最大功率密度高10%至30%.对碳粉比表面积、碳基层表面形貌的扫描电镜测试和不同粒径下的阴极内阻实验发现,一方面当碳粉粒径过大时,碳粉比表面积较小;另一方面当碳粉粒径过小时,碳粉又易在制备过程中发生团聚,两种情况都不利于氧气的传质,均会导致阴极内阻的增大,最终降低了ACMFC的功率密度.“,”In order to investigate the effect of grain sizes of carbon powders of carbon layers which serve as important parts of cathodes of air-cathode microbial fuel cells(ACMFCs),five different carbon base layers were prepared based on carbon powders of different grain sizes(10 000 mesh,8 000 mesh,6 000 mesh,3 000 mesh and 100 nm).Results showed that the grain sizes of carbon powders greatly affected the electricity generation capacities of ACMFCs.The ACMFC with the carbon powder grain size of 10 000 mesh exhibited the highest performance,with the maximum power density being 647.0 mW·m-2,larger than those of the other four ACMFCs by 10%~30%.The reason for this was studied at a micro level by testing the specific surface areas of carbon powders,the morphology of the carbon base layers and the internal resistances of the cathodes.Results showed that the carbon powders with too large grain sizes have small specific surface areas;on the other hand,carbon powders with too small grain sizes tend to agglomerate,these two situations both result in large cathodic resistances,consequently the decrease in power densities of ACMFCs.