A dual-chamber photosynthetic microbial fuel cell(PMFC) was constructed for generating electrical energy through harnessing solar energy by Synechocystis PCC-6803. The effect of relative size of the anode and cathode, proton exchange membrane (PEM) as well as internal resistance to the PMFC were investigated by the methods of polarization curve, electrochemistry impedance spectroscopy and cyclic voltammetry. The results showed the power was stable,with a maximal power density of 72.3 mW/m2. By varying the relative size of the anode and cathode, it is found that the velocity of proton exchange through PEM is slower,which limits the power output of the PMFC. The ohmic resistance, polarization resistance and total internal resistance all exhibit decrease along with the growth of microorganism on the anode upon start of the PMFC significant. Addtionally, the ohmic resistance and the polarization resistance decrease in different magnitude, leading to that the ohmic resistance,which contributes more than half to the internal resistance and serves as the rate-limiting process of the PMFC.%以集胞藻PCC-6803 (Synechocystis PCC-6803)为阳极催化剂搭建直接利用太阳能的双室H-型光合微生物燃料电池(PMFC),通过极化曲线法、交流阻抗法、循环伏安法等电化学方法,开展电极面积比、质子交换膜、内阻等因素对光合微生物燃料电池产电的影响研究.试验结果显示:在PMFC运转过程中,其输出功率稳定,且达到的最大功率密度为72.3 mW/m2:阴阳极面积大小对PMFC产电性能没有显著影响,说明双室光合微生物燃料电池中,质子交换膜传递质子的速率较慢,限制了PMFC发电效能的提高.PMFC启动后,随着生物膜的增长,其欧姆内阻、极化内阻、总内阻都呈现下降的趋势,且欧姆内阻下降的速率小于极化内阻,从而使欧姆内阻占总内阻的比率变大,进一步说明质子交换膜传递质子的速率是限制PMFC发电的关键因素.
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