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Enhanced Coulombic efficiency in glucose-fed microbial fuel cells by reducing metabolite electron losses using dual-anode electrodes |
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| Authors: | Kim Kyoung-Yeol Chae Kyu-Jung Choi Mi-Jin Ajayi Folusho F Jang Am Kim Chang-Won Kim In S |
| Affiliation: | a School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, South Korea b R&D Institute, Kolon Engineering and Construction, 199-5 Jeondae-ri, Pogok-eup, Cheoin-gu, Yongin-si, Gyeonggi 449-815, South Korea c Department of Environmental Engineering, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea |
| Abstract: | Glucose-fed microbial fuel cells (MFCs) have displayed low Coulombic efficiency (CE); one reason for a low CE is metabolite generation, causing significant electron loss within MFC systems. In the present study, notable electron loss (15.83%) is observed in glucose-fed MFCs due to residual propionate, a glucose metabolite. In order to enhance the low CE caused by metabolite generation, a dual-anode MFC (DAMFC) is constructed, which are separately enriched by dissimilar substrates (glucose and propionate, respectively) to effectively utilize both glucose and propionate in one-anode chamber. In the DAMFC, propionate ceases to exist as a source of electron loss, and thus the CE increased from 33 ± 6 to 59 ± 4%. |
| Keywords: | Coulombic efficiency (CE) Dual-anode microbial fuel cell (DAMFC) Electron balance Glucose metabolic pathway Residual metabolites |
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