The Preparation Of Low Potential Modified Anode And Primary Research On Corrosion Protection With Benthic Sediment Microbial Fuel Cell

With the development of economy and the progress of civilization, energy shortage isbecoming a significant problem of our society, meanwhile, The pollution ofenvironment and the greenhouse effect generated by not fully utilization traditionalfossil energy make us develop new energy technology to solve these problems.Benthic Sediment Microbial Fuel Cell (BMFC) is a renewable device that convertschemical energy of organic matter in marine sediment to electrical energy via thecatalyzation of bacteria. BMFC has a simple structure, anode embedded in sediment,and connected by an external circuit to cathode, positioned in overlying water. Theoutstanding combination property of BMFC gains widespread attention of researchers,however, the commercialization has been halted due to their low power density, andonly can generated useful power to supply for small monitor and vehiclecontinusously.People pay more attention to how to increase the output power density of BMFC,optimizing of cell structure and new electrode matter can achieve this goal. Theanodic material and structure can greatly affect microbial attachment, electron transferand substrate oxidation. So, in this paper, one new iron modified anode material isutilized to increase the cell output power，and the analysis results indicate that BMFCwith modified anodes achieve excellent performance, greatly improve the outputvoltage and output power.In this paper, one new iron modified anode is prepared with electrolytic deposition, which has a low anode potential, the properties of BMFC with different modifiedanodes are researched and we want to gain the best manufacturing parameter ofmodified anodes. X-ray diffraction (XRD), Scanning Electric Microscope (SEM),contact angle are used to character the modified graphite anodes. The results ofelectrochemical performance show that modified anodes have a low potential of-775mV and last70days, this electrode is prepared in15min of electrolytic processand a178.9A/m2electrolytic current density. The iron modified anode shows a lowerslope of polarization curve than plain graphite anode, BMFC with modified anodespresent a13.5-fold higher power output997.3mW/m2compared with plain BMFC.This new method of modified electrode and this iron modified anode material couldbe have a great potential to be used for a high-power BMFC.Impressed current cathodic protection always be used in metallic corrosion in sea,however, this method have many problems, for instance, difficulties of power supply,a short time of power supply and high cost of maintenance. In this paper, BMFC areused in metallic corrosion to solve the problems existing in cathodic protection.BMFC was fabricated with304Stainless Steel (304SS) as cathode, researches on thecorrosion behaviors of304SS were analyzed. The potential of304SS in naturalseawater is measured, about-260mV, and the SS with protection about-340mV. Theobservation of Fluorescence Microscope (FM) and Scanning Electric Microscope(SEM) showed: there were no differences on the number of microorganisms on thesurface of SS and the SS with cathodic protection had a low corrosion rate.Electrochemical Impedance Spectroscopy (EIS) and polarization curve weremeasured, the analysis results show that the corrosion resistance of304SS withcathodic protection is increasing with the time increasing, presents a2-fold lowercorrosion current density (Icorr) than304SS without protection. This research couldbe used as a new method of protection against metallic corrosion in sea.