铁碳布空气阴极微生物燃料电池的产电性能

Electricity generation performance of microbial fuel cells with carbon cloth as air-cathode and iron as cathode catalyst

使用铁代替铂作为阴极催化剂,制作含铁碳布空气阴极并构建单室MFC(Fe-C-ACMFC)。以乙酸钠为燃料,通过稳态放电法和循环伏安测试等测试手段,分析了不同铁含量对Fe-C-ACMFC产电性能的影响以及性能最优Fe-C-ACM-FC的连续运行稳定性。结果表明,随着铁含量的增加,Fe-C-ACMFC启动期开路电压(OCV)逐步提高,达到峰值后,随着铁含量的增加而降低;同样,Fe-C-ACMFC极化性能和功率密度等产电性能也随铁含量的增加先升高再降低;当铁含量为0.7 mg/cm2时,MFC的产电性能最优,最大开路电压为593 mV,表观内阻为89Ω,最大功率密度达到12 907 mW/m3,并且经循环伏安测试,电池放电容量几乎没有变化,表明Fe-C-ACMFC的性能比较稳定,能够长期运行。由于铁催化剂价格远远低于铂催化剂,因此,铁碳布空气阴极MFC更利于推广应用。

Single chamber air cathode microbial fuel cells were assembled with iron instead ot platinum as the cathode catalyst and ferrous carbon cloth as cathode. Impact of different iron content on electricity generation performance of MFC and long-run stability performance of iron-carbon air cathode MFC （Fe-C-ACMFC） with acetate as fuel were measured by steady discharging method and cyclic vohammetry. Results showed that with the in- crease of the iron content, the electricity generation performance of MFC was enhanced gradually, but decreased after achieving the peak value; when the iron content was 0.7 mg/cm2 , the best performance of Fe-C-ACMFC was achieved with the maximum open circuit voltage of 593 mV, the apparent internal resistance of 89 Ω, and the maximum power density of 12 907 mW/m3 0.7 mg/cm2 was tested by cyclic vohammetry, The discharge capacity of Fe-C-ACMFC with the iron content of showing that the long-run performance of Fe-C-ACMFC was stable.