Insight into the performance discrepancy of GAC and CAC as air-cathode materials in constructed wetland-microbial fuel cell system.
Constructed wetland-microbial fuel cell (CW-MFC) has exhibited the performance discrepancy between using granular activated carbon (GAC) and columnar activated carbon (CAC) as air-cathode materials. No doubt, this is linked with electrochemical performance and decontaminants characteristics in the CW-MFC system. To provide insight into this performance discrepancy, three CW-MFCs were designed with different carbon-material to construct varied shapes of air-cathodes. The results showed that the ring-shaped cathode filled with GAC yielded a highest voltage of 458 mV with maximum power density of 13.71 mW m-2 and >90% COD removal in the CW-MFC system. The electrochemical characteristics and the electron transport system activity (ETSA) are the driven force to bring the GAC a better electron transportation and oxygen reduction reaction (ORR). This will help elucidating underlying mechanisms of different activated carbon for air-cathode and thus promote its large application.
['Ji|Bin|B|', 'Zhao|Yaqian|Y|', 'Yang|Yang|Y|', 'Tang|Cheng|C|', 'Dai|Yunyu|Y|', 'Zhang|Xiaomeng|X|', 'Tai|Yiping|Y|', 'Tao|Ran|R|', 'Ruan|Weifeng|W|']
Air-cathode Constructed wetland-microbial fuel cell Bioelectrochemical system Carbon-based materials Electricity generation