Research On Structure And Method Microbial Fuel Cell With Flat Continuous Carbon Fiber Anode

Microbial Fuel Cell(MFC)is a technology that uses electricity-generating microorganisms to oxidize organic matter and generate electrons,thereby converting chemical energy into electrical energy.Because of its advantages of low operating cost and sewage energy,MFC is considered to be a new sewage treatment technology.However,low power output and difficulty in large-scale are obstacles to the MFC's large-scale popularization and application.Therefore,how to design a new MFC configuration with high power density and easy large-scale is an important topic in MFC research and practical application.In view of the shortcomings of the configuration of MFC using carbon brushes and carbon felts as anodes,a new configuration of single-chamber air cathode MFC is designed and prepared.The focus of the configuration is to reduce the amount of anode microbial carrier material used,reduce the overall cost of MFC and easy to scale up.The sheet anode is composed of continuous carbon fiber,and the cathode is a carbon cloth loaded with platinum carbon catalyst,and then they are assembled into a small MFC with a volume of 30 mL.After start-up,the output voltage is 0.47V and the maximum power density is 4.3mW/g.Taking carbon brush and carbon felt as the control group,it was found through electrochemical characterization and scanning electron microscope that the continuous carbon fiber anode used had better electron transmission efficiency and lower cost.After optimizing the distance between cathode and anode(1.5cm),the voltage of the cell rose to 0.52V,and the maximum power density rose to 5.8mW/g.After adding carbon nanotubes on the surface of the carbon fiber,the output voltage of the cell rose to 0.54V,and the maximum power density was 8.3mW/g.After that,the small MFC was enlarged,and the volume was increased to 320mL.The maximum power density of the medium-sized MFC is 2.47W/m3,and the internal resistance value obtained by fitting the polarization curve is 194?.Current interruption method and electrochemical impedance spectroscopy prove that the internal resistance of medium-sized MFC is smaller than that of small-sized MFC?Then,two medium-sized MFCs are connected in series.Within 30 days of operation,the MFC stack reached a stable period on the ninth day.After calculation,the voltage loss rate of the MFC stack relative to a single cell is about 10%.In short,the new flat-plate MFC with continuous carbon fiber as the anode used in this article shows excellent power generation performance.And in the case of generating the same electrical energy,the new MFC greatly reduces the use of anode carbon fiber materials,reduce the assembly cost of high-performance MFC and increase amplifying the application potential.At the same time,the amplification of the flat-panel MFC and multi-cell series studies have shown that the MFC is easy to amplify and can break through the voltage limit of a single cell.It has laid a good foundation for the industrialization and development of high-performance MFC batteries in the future.