Innovative microbial fuel cell for electricity production from anaerobic reactors
Innovative microbial fuel cell for electricity production from anaerobic reactors
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DOI：
10.1016/j.jpowsour.2008.01.076
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发表时间：
2008-05-15
影响因子：
9.2
通讯作者：
Angelidaki, Irini
中科院分区：
文献类型：
--
作者：
Min, Booki;Angelidaki, Irini
将阳极电极和阴极室浸入厌氧反应器中，研制了一种潜水微生物燃料电池（SMFC）。实验以生活污水为培养基和接种剂。SMFC可以成功地产生0.428 +/- 0.003 V的稳定电压，使用固定的470 ω ω电阻。极化试验结果表明，当电流密度为595 mA m(-2)（外电阻为180 ω）时，得到的最大功率密度为204 mW m（-2）。发电量与废水强度呈饱和关系，最大功率密度（P-max）为218 mW m(-2)，饱和常数（K-s）为244 mg L-1。在SMFC中实现更高电力产量的主要限制被确定为电解质的高内阻和阴极电极的低效电子转移。随着电流的增加，电压下降的很大一部分是由于两电极之间存在的介质的欧姆（电解质）电阻引起的，尽管两电极位置很近（约3cm距离，内阻= 35 +/- 2 ω）。阴极的开路电位（与标准氢电极相比为0.393 V）远小于理论值（0.804 V）。此外，在SMFC发电过程中，阴极电极的短路电位减小。这些结果表明，SMFC可以成功地从废水中发电，并且在现有的厌氧反应器或其他厌氧环境（如沉积物）中具有巨大的发电潜力。SMFC的优点是不需要专门的厌氧室（阳极室），因为现有的厌氧反应器可以使用，阴极室和阳极电极都是浸入式的。(C) 2008 Elsevier B.V.版权所有
A submersible microbial fuel cell (SMFC) was developed by immersing an anode electrode and a cathode chamber in an anaerobic reactor. Domestic wastewater was used as the medium and the inoculum in the experiments. The SMFC could successfully generate a stable voltage of 0.428 +/- 0.003 V with a fixed 470 Omega resistor from acetate. From the polarization test, the maximum power density of 204 mW m(-2) was obtained at current density of 595 mA m(-2) (external resistance = 180 Omega). The power generation showed a saturation-type relationship as a function of wastewater strength, with a maximum power density (P-max) of 218 mW m(-2) and a saturation constant (K-s) of 244 mg L-1. The main limitations for achieving higher electricity production in the SMFC were identified as the high internal resistance at the electrolyte and the inefficient electron transfer at the cathode electrode. As the current increased, a large portion of voltage drop was caused by the ohmic (electrolyte) resistance of the medium present between two electrodes, although the two electrodes were closely positioned (about 3 cm distance; internal resistance = 35 +/- 2 Omega). The open circuit potential (0.393 V vs. a standard hydrogen electrode) of the cathode was much smaller than the theoretical value (0.804 V). Besides, the short circuit potential of the cathode electrode decreased during the power generation in the SMFC. These results demonstrate that the SMFC could successfully generate electricity from wastewater, and has a great potential for electricity production from existing anaerobic reactors or other anaerobic environments such as sediments. The advantage of the SMFC is that no special anaerobic chamber (anode chamber) is needed, as existing anaerobic reactors can be used, where the cathode chamber and anode electrode are immersed. (C) 2008 Elsevier B.V. All rights reserved.