بررسي اثر افزايش نانو ذرات نقره به كاتوليت در عملكرد پيلهاي سوختني ميكروبي

چكيده انگليسي :

z Effect of Nano silver Additive in Catholyte on the Performance of Microbial Fuel Cells Rahman Kazemian Rahman ir@yahoo com Date of Submission Jul 05 2010 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Language Degree M Sc Farsi Supervisor Ali A Dadkhah Dadkhah@cc iut ac ir AbstractCurrently the main sources of energy which are used for various human activities arefossil and nuclear fuels However due to many parameters affecting these two types offuels such as environmental concerns and limitations in resources governments andscientist are paying much attention to new alternative sources of energy especially tothose methods with dual applications such as microbial fuel cells MFC These cells canbe utilized for both organic waste treatment and electrical energy production In thisstudy a series of experiments were performed to investigate the effect of addition of nanosilver particles to catholyte cathodic solution of an MFC on power generation There aremany different designs and configurations for MFCs For purpose of this study a twochamber batch operated microbial fuel cell consisting of a cathode and an anode chamber which were separated by a proton exchange membrane PEM was set up Anolyte anodic solution consisted of 400 ml of a prepared solution which contained appropriateamounts of glucose as substrate and other needed supplements for bacterial growth andpH adjusters in addition to bacteria E Coli O78 K80 which was prepared withappropriate procedures including inoculation and incubation After the first run subsequent experiments were carried out using the bacteria of previous runs utilizingelectrochemical activation of bacteria Catholyte in pure case consisted only of puredeionized water with bubbling air into it to provide oxygen for completion of the reactionat cathode Experiments were performed using two types of electrodes consisting ofcarbon paper and carbon cloth In each experiment anode and cathode were of similartype For each type of electrode five experiments carried out one without nano silverparticles and four with 1 5 10 and 15 ppm concentrations of nanoparticles Duration of each cycle of fuel cell operation was about 25 to 30 hours In these experiments first measurable increase in power generation was recorded at 5 ppmconcentration of nanoparticles This increase continued with increase of concentration upto 15 ppm For carbon paper electrode at 15 ppm concentration an 18 increase inmaximum current and 26 increase in maximum power relative to case withoutnanoparticles was observed For carbon cloth electrode same trend was observed with19 and 29 increases for maximum current and power respectively Furtherinvestigations on catholyte by voltammetry and conductometry verified the positiveeffects of nano silver particles Also transmission electron microscopy TEM photographs of electrode surfaces showed binding of nanoparticles on the surface Inaddition to effect of presence of nanoparticles in catholyte mixing effects in both cathodeand anode chambers were investigated At a fixed nanoparticles concentration of 10 ppm

كاظميان، رحمان

بررسي اثر افزايش نانو ذرات نقره به كاتوليت در عملكرد پيلهاي سوختني ميكروبي

پيل هاي دو محفظه اي