实验测试微生物燃料电池（MFC）不同外阻下，阳极液和阴极液pH值、电导率和输出电压随时间的变化情况。并从质量和能量角度对实验结果进行了分析讨论。结果表明：在低外阻下长期运行时，MFC溶液pH值和电导率会出现迅速变化。当外阻固定为100Ω时，阴极液和阳极液之间最大pH值差为0．82，最大电导率差为2．14mS／cm，极限电流为2．69mA；当外阻固定为500Ω时，最大pH值差为0．41，最大电导率差为1．55mS／cm，极限电流为3．83mA。实验结果及分析还表明，减小MFC运行过程中阴极液和阳极液pH值和电导率的变化，改善低外阻条件下生成物和反应物的质量传输对提高MFC的性能至关重要。
The pH and ionic conductivity of anode and cathode solutions and the voltage output of a microbial fuel cell （MFC） were tested at different external resistances, and the results were analyzed in detail fl＇om the perspective of mass and energy in this paper. Experimental results show that the solution pH and ionic conductivity changed sharply after the MFC operated with small external resistances for a long period of time. If the external resistance was fixed at 100 Ω, the maximum pH difference between the cathode and anode solution was 0.82, the maximum ionic conductivity difference was 2.14 mS/cm, and the corresponding limiting current was 2.69 mA; If the external resistance was fixed at 500 Ω, the maximum pH difference was reduced to 0.41, the maximum ionic conductivity difference was 1.55 mS/cm, and the corresponding limiting current was 3.83 mA. The experimental results and analysis prove that for small external resistances reducing the changes of the solution pH and ionic conductivity during the MFC operation and enhancing the mass transfer of the reactants and products are of crucial importance for improving the MFC performance.
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