Enhanced anode performance of microbial fuel cells by adding nanosemiconductor goethite
Enhanced anode performance of microbial fuel cells by adding nanosemiconductor goethite
复制标题
添加纳米半导体针铁矿增强微生物燃料电池的阳极性能
DOI：
10.1016/j.jpowsour.2012.09.057
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发表时间：
2013-02
影响因子：
9.2
通讯作者：
Ai L.
中科院分区：
文献类型：
--
作者：
Peng X.;Yu H.;Wang X.;Gao N.;Geng L.;Ai L.
将质量分数分别为0、2.5%、5.0%和7.5%的纳米针铁矿添加到活性炭粉末中，并将其轧制到不锈钢丝网上，制备新型微生物燃料电池阳极。添加5.0% α-FeOOH的MFC的最大功率密度（693 ± 20 mW m−2）比AC对照（508 ± 40 mW m −2）高36%。电化学阻抗和极化测试结果表明，纳米α-FeOOH的加入降低了细菌与电极之间的电荷传递电阻，增大了交换电流密度和阳极峰电流，从而在动力学上促进了细菌与电极之间的胞外电子传递。恒相元素的增加和瓦尔堡元素的减少表明α-FeOOH的加入提高了阳极表面的电容和扩散条件。然而，过量的α-FeOOH的7.5%，招致的表面电导率，电容和扩散的负面影响，可能是由于生物Fe（II）的吸附在阳极表面。
Nano goethite with contents of 0, 2.5%, 5.0% and 7.5% (mass percentage) were added into activate carbon powder (AC) and rolled onto stainless steel mesh to fabricate new anodes for microbial fuel cells (MFCs). The maximum power density of MFC with 5.0% α-FeOOH (693 ± 20 mW m−2) is 36% higher than that of the AC control (508 ± 40 mW m−2). Based on the decrease of charge transfer resistance and the increases of both exchange current density and anodic peak current in electrochemical impedance and polarization tests, the addition of nano α-FeOOH kinetically promotes the extracellular electron transfer between bacteria and the electrode. The increase of constant-phase element and the decrease of Warburg element show that α-FeOOH enhances both the capacitance and diffusion condition on the surface of anode. However, the excess α-FeOOH of 7.5% incurs a negative effect on surface conductivity, capacitance and diffusion, probably due to the adsorption of biogenic Fe(II) on the anodic surface.
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