2种不同结构的微生物燃料电池的产电性能比较

Comparison of Power Generation in Microbial Fuel Cells of Two Different Structures

微生物燃料电池(microbial fuel cell,MFC)目前仍面临着产能低和成本高的问题,因此系统比较同样条件下不同结构MFC的产电性能对于最终提高其产电效率具有重要意义.通过构建2种不同结构的MFC反应器:单室型MFC和双室型MFC,以乙酸为燃料,固定外电阻为1000Ω,对其产电性能进行了比较研究.结果表明,单室型MFC和双室型MFC均可稳定地输出电能,平均最大输出电压分别为600mV和650mV,平均运行周期分别为110h和90h;单室型MFC和双室型MFC的最大面积功率密度分别为113.8mW/m2和382.4mW/m2,最大体积功率密度分别为1.3mW/m3和2.2mW/m3;根据稳态放电法确定双室型MFC的内阻为188Ω,单室型MFC的内阻为348Ω,双室型MFC的产电性能及运行稳定性均优于单室型MFC.阳极的面积和质子通道的大小都会对MFC的库仑效率产生影响.

Low electricity productivity and high cost are two problems facing the development of microbial fuel cell （ MFC）. Comparative studies on electricity generation in MFCs of different designs while under the same conditions are important in enhancing the power output. Singlechamber MFC and dual-chamber MFC were constructed and acetate was used as the fuel. Power outputs in these MFC were compared side by side with a resistance of 1 000 Ω connected to each. Experimental results showed that the electricity was generated continuously and steadily in the MFCs. The average maximum output voltages obtained by the single-chamber and dual-chamber MFCs were 600 and 650 mV, respectively. The electric cycles were operated for 110 and 90 h for the single-chamber and dual-chamber MFCs, respectively. From the single-chamber and dual-chamber MFCs, the maximum area power densities were 113.8 and 382.4 mW/m^2 respectively, and the maximum volumetric power densities were 1.3 and 2.2 mW/m^3 respeetively. The internal resistances of single-chamber and dual-chamber MFC were 188 and 348 Ω, respectively. Results indicated that the dual-chamber MFC had a better performance than the single-chamber MFC. The effective area of anode and the proton exchange membrane had a significant effect on the performance of MFCs.