Performance of non-porous graphite and titanium-based anodes in microbial fuel cells
Performance of non-porous graphite and titanium-based anodes in microbial fuel cells
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DOI：
10.1016/j.electacta.2008.03.032
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发表时间：
2008-07-20
影响因子：
6.6
通讯作者：
Buisman, Cees J. N.
中科院分区：
文献类型：
--
作者：
ter Heijne, Annemiek;Hamelers, Hubertus V. M.;Buisman, Cees J. N.
比较了四种无孔材料作为微生物燃料电池（MFC）生物阳极的适用性。这些材料是扁平石墨、粗糙石墨、铂涂层钛和未涂层钛。将材料放置在四个相同的MFC中，其中阳极室和阴极室液压串联连接。MFC用四个电阻器操作。用直流伏安法和电化学阻抗谱（EIS）研究了这些电极材料的阳极动力学。比较了两种技术，结果表明，生物阳极性能按粗糙石墨> Pt涂层钛>扁平石墨>未涂层钛的顺序降低。未涂覆的钛不适合作为阳极材料。对于其他三种材料，比表面积不是解释不同材料电流密度差异的单一变量。所有的极化曲线都显示出明显的极限电流。该极限不能归因于基质的传质，而是反映了最大生物量活性。除了未涂覆的钛阳极之外，无孔生物阳极的电流密度在归一化到投影表面积时与所报道的多孔材料的电流密度相当。然而，通过直流伏安法记录的高电流密度不能以稳定的方式保持较长的时间。这表明，MFC的极化曲线应严格评估。(C)2008爱思唯尔有限公司保留所有权利。
Four non-porous materials were compared for their suitability as bio-anode in microbial fuel cells (MFCs). These materials were flat graphite, roughened graphite, Pt-coated titanium, and uncoated titanium. The materials were placed in four identical MFCs, of which the anode compartments were hydraulically connected in series, as well as the cathode compartments. The MFCs were operated with four resistors. The anode kinetic's at these electrode materials were studied by means of dc-voltammetry and electrochemical impedance spectroscopy (EIS). Both techniques were compared and showed that the bio-anode performance decreased in the order roughened graphite > Pt-coated titanium > flat graphite > uncoated titanium. Uncoated titanium was unsuitable as anode material. For the other three materials, specific surface area was not the single variable explaining the differences in current density for the different materials. All polarization curves showed a clear limiting current. This limit could not be attributed to mass transfer of the substrate and reflected the maximum biomass activity. The current density of the non-porous bio-anodes, except for the uncoated titanium anode, was comparable to the reported current densities of porous materials when normalized to the projected surface area. The high current densities that were recorded by dc-voltammetry, however, could not be maintained in a stable way for a longer period. This shows that polarization curves of MFCs should be evaluated critically. (C) 2008 Elsevier Ltd. All rights reserved.