Preparation And Properties Of Hematite Modified Microbial Fuel Cell Anode Meterials

Compared with traditional fuel cells,microbial fuel cells(MFCs)have the advantages of easy availability of raw materials,wide sources,relatively mild reaction conditions,clean environmental protection,and good biocompatibility.In addition,the growth environment of the microorganisms is easy to control,so that the battery system has the characteristics of good stability and high maintenance convenience.However,defects such as low output power and high use cost severely constrain the development of MFC.As an important part of MFC,anode can be used as a carrier for microorganisms to directly affect the adhesion of electron-producing bacteria and the extracellular transfer of electrons.It is an important factor that restricts the ability of MFC to produce electricity.In view of the low power output and high cost of MFC,this paper proposes a new anode modification method-hydrothermal synthesis of hematite array modified MFC anode material,and composes it into hematite semiconductor-microorganism-light energy.Then,we test the performance of the composite system.The specific research content is as follows:In this paper,hydrothermal synthesis of precursor nano-needle iron ore arrays is studied.The influence of hydrothermal reaction time and the proportion of space occupied by the reactor on the size morphology of the precursors is explored.Different time gradients and different proportions of reaction vessel space are set up here.The experimental control group is briefly analyzed by SEM and other characterization methods.The results show that the optimal time for the hydrothermal reaction is 4 hours,too short or too long time is not conducive to the formation of a homogeneous precursor goethite array.When the ratio of the volume of the solution to the total volume of the reactor is 30:100,the morphology size of the goethite precursor is well controlled and the array structure is overall exhibited.The average diameter is 30 nm to 140 nm,and the average length is 300 nm to 1 ?m.After the high-temperature calcination method was used to successfully convert the goethite precursor into a hematite array,a series of characterizations and performance tests are performed.The LSV tests shows that the photoelectrode modified by hematite is The photocurrent output can be significantly increased under light conditions.I-t test shows that the modified electrode has good stability.The CV test shows that under anaerobic conditions,there is active electron transfer between the cells and the hematite anode,and the c-type cytochrome is essential for extracellular electron transport and can interact electrochemically with external electrodes.Fluorescence confocal and other characterizations indicate that there is good compatibility between the electrogenic bacteria and hematite,and the hematite-modified anode electrode is also more conducive to the adhesion of electrotrophic bacteria,which is more conducive to electrogenic bacteria and anode electrodes.In addition,the mechanism and prospects of the MFC are also described at the same time,and the feasibility of modifying the anode electrode with a hematite array is analyzed.