Proton exchange membrane and electrode surface areas as factors that affect power generation in microbial fuel cells
Proton exchange membrane and electrode surface areas as factors that affect power generation in microbial fuel cells
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DOI：
10.1007/s00253-005-0066-y
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发表时间：
2006-03-01
影响因子：
5
通讯作者：
Logan, BE
中科院分区：
文献类型：
--
作者：
Oh, SE;Logan, BE
微生物燃料电池（mfc）的发电是质子交换膜（PEM）和阴极相对于阳极的表面积的函数。为了证明这一点，在具有三种不同表面积的PEM的双室mfc中，阳极和阴极的尺寸是不同的(A（PEM)=3.5, 6.2或30.6 cm(2)）。对于固定的阳极和阴极表面积(a (An)= a (Cat)=22.5 cm(2))，标准化到阳极表面积的功率密度随着PEM尺寸的增加而增加，顺序为45 mW/m(2) (a (PEM)=3.5 cm(2)), 68 mW/m(2) (a （PEM)=6.2 cm(2)）和190 mW/m(2) (a （PEM)=30.6 cm(2)）。由于内阻增加，当PEM的表面积小于电极的表面积时，PEM的表面积会限制功率输出。当PEM、阳极和阴极的相对横截面按照2A(Cat)=A(PEM)=2A（An）进行缩放时，基于PEM的表面积(A(PEM)=3.5、6.2或30.6 cm(2))，三种不同mfc的最大功率密度是相同的（168 +/- 4.53 mW/m(2)）。增加离子强度和在阴极使用铁氰化物也增加了功率输出。
Power generation in microbial fuel cells (MFCs) is a function of the surface areas of the proton exchange membrane (PEM) and the cathode relative to that of the anode. To demonstrate this, the sizes of the anode and cathode were varied in two-chambered MFCs having PEMs with three different surface areas (A(PEM)=3.5, 6.2, or 30.6 cm(2)). For a fixed anode and cathode surface area (A(An)=A(Cat)=22.5 cm(2)), the power density normalized to the anode surface area increased with the PEM size in the order 45 mW/m(2) (A(PEM)=3.5 cm(2)), 68 mW/m(2) (A(PEM)=6.2 cm(2)), and 190 mW/m(2) (A(PEM)=30.6 cm(2)). PEM surface area was shown to limit power output when the surface area of the PEM was smaller than that of the electrodes due to an increase in internal resistance. When the relative cross sections of the PEM, anode, and cathode were scaled according to 2A(Cat)=A(PEM)=2A(An), the maximum power densities of the three different MFCs, based on the surface area of the PEM (A(PEM)=3.5, 6.2, or 30.6 cm(2)), were the same (168 +/- 4.53 mW/m(2)). Increasing the ionic strength and using ferricyanide at the cathode also increased power output.