标题：Nano-structured manganese oxide as a cathodic catalyst for enhanced oxygen reduction in a microbial fuel cell fed with a synthetic wastewater
作者：Xian-Wei liu;Xue-Fei Sun;Yu-Xi Huang;Guo-Ping Sheng;Kang Zhou;Raymond J. Zeng;Fang Dong;Shu-Guang Wang;An-Wu Xu;Zhong-Hua Tong;H
作者机构：[Liu, X.-W] Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;[ Sun, X.-F] School of Environmental Science a 更多
通讯作者地址：[Yu, HQ]Univ Sci & Technol China, Dept Chem, Hefei 230026, Peoples R China.
来源：Water research: A journal of the international water association
关键词：electrochemistry;manganese oxides;microbial fuel cell (MFC);nanostructure;oxygen reduction;synthetic wastewater
摘要：Microbial fuel cells (MFCs) provide new opportunities for the simultaneous wastewater treatment and electricity generation. Enhanced oxygen reduction capacity of cost-effective metal-based catalysts in an air cathode is essential for the scale-up and commercialization of MFCs in the field of wastewater treatment. We demonstrated that a nano-structured MnO_x material, prepared by an electrochemically deposition method, could be an effective catalyst for oxygen reduction in an MFC to generate electricity with the maximum power density of 772.8 mW/m~3 and remove organics when the MFC was fed with an acetate-laden synthetic wastewater. The nano-structured MnO_x with the controllable size and morphology could be readily obtained with the electrochemical deposition method. Both morphology and manganese oxidation state of the nano-scale catalyst were largely dependent on the electrochemical preparation process, and they governed its catalytic activity and the cathodic oxygen reduction performance of the MFC accordingly. Further-more, cyclic voltammetry (CV) performed on each nano-structured material suggests that the MnO_x nanorods had an electrochemical activity towards oxygen reduction reaction via a four-electron pathway in a neutral pH solution. This work provides useful information on the facile preparation of cost-effective cathodic catalysts in a controllable way for the single-chamber air-cathode MFC for wastewater treatment.