Preparation Of Metal Oxides Composites And Research On The Properties In Microbial Fuel Cells

Microbial Fuel Cells are devices that use electro-microorganism to disintegrate organic matrices and produce electricity.Using electro-microorganism to achieve purification in waste water.It is a truly sustainable green energy technology.This new technology provides a new way for people to deal with water pollution and solve the energy crisis.Anodes,as an important part of microbial fuel cells,have the greatest impact on the power generation performance of microbial fuel cells.Using materials to modify anodes is a common way to get high-performance microbial fuel cells.Using Biocompatible metal oxide to modify anode can get high performance MFC.This article use manganese cobalt oxide and manganese iron oxide as the target materials to modify anodes and get high power generation and energy storage performance microbial fuel cells.Drip and drop method and in situ growth method were used to prepare D-MCO/CF electrode and S-MCO/CF electrode.These two electrodes were served as anodes in MFC,They could harvest the maximum power density of 2919mW/m~3 and 3344mW/m~3,which were 1.33 and 1.53 times of carbon felt anodes.When they were full charged,0.4543C/cm~2and 0.8714C/cm~2 of charge could be discharged,which were 2.98 and 5.72 times of carbon felt anodes(2191mW/m~3).Using drip and drop methods to make MFO can harvest 3990mW/m~3.When it was full charged,0.8714C/cm~2 of charge could be discharged.CNTs-MCO/CF electrodes and CNTs-MFO electrodes were prepared by compounding CNTs with high conductivity with MCO and MFO materials respectively.The prepared electrodes were applied to MFC and served as anodes,respectly having the maximum power density of 3660mW/m~3 and 4773mW/cm~3,which were 1.74 times and 2.18 times of the CF anode cells respectly.The charge stored when the anodes were fully charged were0.2208C/cm~2 and 0.4618C/cm~2,respectly.It indicated that CNTs-doped composites had good biocompatibility and could accelerate the transfer of electrons from the biofilm to the anodes.Drip and drop method was used to prepare MCO-MFO/CF electrodes,The prepared anodes were served as anodes in MFC and could harvest the maximum power density of4268mW/m~3,which was 1.95 times of CF anodes.The charge discharged when the anodes were fully charged was 0.3436C/cm~2,which were 2.25 times of CF anodes.This was duo to synergy of MCO and MFO to further enhance power production of MFC,exelled single composite metal oxide.