Reproducible polarization test methods and fair evaluation of polarization data by using interconversion factors in a single chamber cubic microbial fuel cell with a brush anode
Journal of Cleaner Production, ISSN: 0959-6526, Vol: 390, Page: 136157
2023
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Article Description
MFC research has been conducted enormously in the last decade, and their electrochemical data has been accumulated enormously. Although reproducible measurement method and fair evaluation are essential elements in research, these elements are missing in MFC research. Herein, using single-chamber cubic MFCs, diverse polarization methods were conducted along with other electrochemical tests. 3-hour optimum resistance operation followed by 2-h open circuit time prevented power overshoots. In a faster polarization method, data reproducibility increased drastically, power and current were larger, and polarization resistance was smaller. In ERC-30 min, LSV-0.1, LSV-1, LSV-10 mV/s and, maximum power density was 1242, 1518, 2287 and 3417 mW/m 2, and internal resistance 76, 63, 48 and 35 Ω, respectively. For fair evaluation of different polarization data, the interconversion factors were developed and applied. During the optimum resistance operation, average power and current densities were 994 mW/m 2 and 3767 mA/m 2, respectively. As similarly in the polarization tests, cathodic impedances (24.1 Ω) were 2.4 times larger than the anodic impedances (10.2 Ω). Charge transfer impedance (32.4 Ω) was the major component (>95%) in the electrodes and the whole cell (34.3 Ω). Ohmic impedance was detected only in the anode (0.2 Ω), and diffusion impedance was detected only in the cathodes (1.7 Ω). Cathodic capacitance (1.62 F) was 2.5 times larger than the anodic capacitance (0.64 F). Cyclic voltammogram cathodic capacitance (7.78 F) was 1.6 times larger than the anodic capacitance (4.76 F). Longer operation, lower internal resistance and higher anode performance increased coulombic and energy efficiencies. This study contains very important information on experimental accuracy and reproducibility, essential elements in research, and will greatly contribute to the firm foundation and the meaningful growth of the MFC research.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0959652623003153; http://dx.doi.org/10.1016/j.jclepro.2023.136157; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85146659872&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0959652623003153; https://dx.doi.org/10.1016/j.jclepro.2023.136157
Elsevier BV
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