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Improved performance of membrane free single-chamber air-cathode microbial fuel cells with nitric acid and ethylenediamine surface modified activated carbon fiber felt anodes |
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| Authors: | Nengwu Zhu Xi Chen Ting Zhang Pingxiao Wu Ping Li Jinhua Wu |
| Institution: | a College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China b The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, China c The Key Lab of Pollution Control and Eco-remediation of Guangdong Provincial Higher Education, Guangzhou 510006, China |
| Abstract: | Surface modifications of anode materials are important for enhancing power generation of microbial fuel cell (MFC). Membrane free single-chamber air-cathode MFCs, MFC-A and MFC-N, were constructed using activated carbon fiber felt (ACF) anodes treated by nitric acid and ethylenediamine (EDA), respectively. Experimental results showed that the start-up time to achieve the maximum voltages for the MFC-A and MFC-N was shortened by 45% and 51%, respectively as compared to that for MFC-AT equipped with an unmodified anode. Moreover, the power output of MFCs with modified anodes was significantly improved. In comparison with MFC-AT which had a maximum power density of 1304 mW/m2, the MFC-N achieved a maximum power density of 1641 mW/m2. The nitric acid-treated anode in MFC-A increased the power density by 58% reaching 2066 mW/m2. XPS analysis of the treated and untreated anode materials indicated that the power enhancement was attributable to the changes of surface functional groups. |
| Keywords: | Microbial fuel cell Anode Surface modification Activated carbon fiber felt Carbon electrode modification |
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