期刊
BIOELECTROCHEMISTRY
卷 72, 期 2, 页码 149-154出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2008.01.004
关键词
microbial fuel cell; electrochemical impedance spectroscopy; internal resistance of a microbial fuel cell
Electrochemical impedance spectroscopy (EIS) has been used to determine several electrochemical properties of the anode and cathode of a mediatorless microbial fuel cell (MFC) under different openational conditions. These operational conditions included a system with and without the bacterial catalyst and EIS measurements at the open-circuit potential of the anode and the cathode or at an applied cell voltage. In all cases the impedance spectra followed a simple one-time-constant model (OTCM) in which the solution resistance is in series with a parallel combination of the polarization resistance and the electrode capacitance. Analysis of the impedance spectra showed that addition of Shewanella oneidensis MR-1 to a solution of buffer and lactate greatly increased the rate of the lactate oxidation at the anode under open-circuit conditions. The large decrease of open-circuit potential of the anode increased the cell voltage of the MFC and its power output. Measurements of impedance spectra for the MFC at different cell voltages resulted in determining the internal resistance (R-int) of the MFC and it was found that R-int is a function of cell voltage. Additionally, R-int was equal to R-ext at the cell voltage corresponding to maximum power, where R-ext is the external resistance that must be applied across the circuit to obtain the maximum power output. (C) 2008 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据