Research On Power Acquisition And Driving Temperature And Humidity Sensor Of Microbial Fuel Cell

With the rapid development of the economy,energy demand has increased year by year,traditional fossil energy is on the verge of exhaustion,and research on clean and efficient renewable energy is imminent.Microbial Fuel Cells(MFC)have access to electrical energy while degrading pollutants,and have broad prospects in the environment and new energy fields.However,the MFC output has a low open circuit voltage and a small output power.Therefore,it is often difficult for a microbial fuel cell to directly drive a currently existing micro power consumption component.This project has developed a new energy management method for microbial fuel cells.The energy collection in MFC is effectively collected and applied to the driving of temperature and humidity sensors,which lays a foundation for the promotion and application of MFC.In this paper,anhydrous sodium acetate,glucose,lactose and pretreated wild carp were used as anode substrates to study the periodic curve and polarization curve of different substrate batteries.The voltage generation curve and polarization curve were used to analyze the electricity generation of different substrates.Characteristics,the anode substrate with the best electrical performance is selected as the energized microbial fuel cell.Then,different types of supercapacitors are charged by using different operation modes of a single MFC,series or parallel multiple MFCs,and the influence of charging mode on the supercapacitor charging speed under different operating modes is compared,and the optimal operation mode of the MFC is obtained.Finally,power different supercapacitors and loads to select the supercapacitor that best stores the energy of the microbial fuel cell.Finally,the best charging energy storage path is determined,and the temperature and humidity sensor is energized to realize the application of MFC power collection and driving the temperature andhumidity sensor.The experimental results showed that different substrates have different effects on the MFC production performance and have different output voltages to the battery.Compared with different substrate conditions,the current density,power density and internal resistance of the battery could be obtained.When the four substrates of sodium acetate,glucose,lactose and pretreated wild mash started MFC,the optimal open circuit voltage values were 0.77 V,0.75 V,0.71 V,0.66 V,respectively,and the power generation characteristics and power of the battery were studied.Density curve,the best power generation performance MFC internal resistance and output power density were 330 Ω and 718.84 mW.cm-2,respectively.Furthermore,the high-performance,synchronous boost power acquisition module BQ25504 was used as the main component to build the drive circuit of the power management system.The research on the optimal operation mode of MFC analyzed the parallel connection of 2,4,6 MFC and 6 MFC charging in series.In this way,it was concluded that six MFCs in series were most suitable for charging the supercapacitor;and then charging experiments of four types of supercapacitors of 1F,2.5F,3.5F,and 4F were performed by connecting six MFCs in series,and the results showed that the supercapacitor of3.5F was stored.The power was the largest and the average charging power was0.973 mW,which verified that the 3.5F supercapacitor has the best performance for serial MFC power storage.When the storage capacitor(4.0F)was used to make the charging voltage reach 3.0V,the two 4.0F supercapacitors were connected in series to discharge the temperature and humidity sensor load.The sensor maintenance time was 226 s,which verified that the MFC power management system could drive the temperature and humidity sensor load.