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KMID : 1137820180390050220
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의공학회지
2018 Volume.39 No. 5 p.220 ~ p.228
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Identification of Internal Resistance of Microbial Fuel Cell by Electrochemical Technique and Its Effect on Voltage Change and Organic Matter Reduction Associated with Power Management System
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Jang Jae-Kyung
Park Hye-Min
Kim Tae-Young
Yang Yoon-Seok
Yeo Jeong-Jin
Kang Suk-Won
Paek Yee
Kwon Jin-Kyung
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Abstract
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The internal resistance of microbial fuel cell (MFC) using stainless steel skein for oxidizing electrode was investigated and the factors affecting the voltage generation were identified. We also investigated the effect of power management system (PMS) on the usability for MFC and the removal efficiency of organic pollutants. The performance of a stack microbial fuel cell connected with (PMS) or PMS+LED was analyzed by the voltage generation and organic matter reduction. The maximum power density of the unit cells was found to be 5.82 W/m3 at 200 Ω. The maximum current density was 47.53 A/m3 without power overshoot even under 1 Ω. The ohmic resistance (Rs) and the charge transfer resistance (Rct) of the oxidation electrode using stainless steel skein electrode, were 0.56 Ω and 0.02 Ω, respectively. However, the sum of internal resistance for reduction electrode using graphite felts loaded Pt/C catalyst was 6.64 Ω. Also, in order to understand the internal resistance, the current interruption method was used by changing the external resistance as 50 Ω, 300 Ω, 5 kΩ. It has been shown that the ohm resistance (Rs) decreased with the external resistance. In the case of a series-connected microbial fuel cell, the reversal phenomenon occurred even though two cells having the similar performance. However, the output of the PMS constantly remained for 20 hours even when voltage reversal occurred. Also the removal ability of organic pollutants (SCOD) was not reduced. As a result of this study, it was found that buffering effect for a certain period of time when the voltage reversal occurred during the operation of the microbial fuel cell did not have a serious effect on the energy loss or the operation of the microbial fuel cell.
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KEYWORD
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Microbial fuel cell, Series- and parallel-connection, Power management system, Internal resistance, Organic removal
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