【摘要】 钛网作为微生物燃料电池(MFC)的集电材料,表面的氧化层对其导电性有一定影响。以0.3 mm×20目的钛网为例,与相同规格的纯钛相比,其导电性下降了42.4%。对填料型MFC采用不同的集电方式,并联集电时的最大功率密度(34.62 W/m3)比近膜侧集电和远膜侧集电时分别提高了40.7%和45.9%。通过电化学阻抗法分析得到三种集电方式下MFC的欧姆阻力分别为0.26、0.36和0.38Ω。在填料型MFC的欧姆阻力中,电子传导阻力一般大于离子传导阻力,而电子传导阻力的主要来源是集电材料与电极的接触阻力。通过并联集电的方式能够减小集电材料与电极的接触阻力,进而降低MFC的内阻,提高其功率密度。更多还原

【Abstract】 Titanium mesh was used as the current collector in microbial fuel cell( MFC),and the surface oxide layer affected its conductivity. The conductivity of titanium mesh with 0. 3 mm × 20 mesh was decreases by 42. 4% compared to the pure titanium of the same size. Different current collecting methods were tested on the packing-type MFC. The maximum power density of 34. 62 W / m3 was obtained when collecting current in parallel,increased by 40. 7% and 45. 9% compared to collecting current in the membrane-proximal region and the membrane-distal region,respectively. The MFC’s ohmic resistances under the three different current collecting methods were 0. 26 Ω,0. 36 Ω and 0. 38 Ω,respectively,according to electrochemical impedance spectroscopy tests. In the ohmic resistance of the packingtype MFC,the electronic conduction resistance was generally higher than the ionic conduction resistance,while the major part of the electronic conduction resistance was the connection resistance between the current collector and the electrode. Collecting current in parallel could reduce the connection resistance,thereby decrease the internal resistance and improve the power density.更多还原