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微生物燃料电池不同阳极底物产电性能研究.docx

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微生物燃料电池不同阳极底物产电性能研究 Introduction Microbialfuelcells(MFCs)arebio-electrochemicalsystemsthatusebacteriatoconvertorganiccompoundsintoelectricity.MFCsareconsideredasaninnovativeandeco-friendlyalternativeforproducingelectricalenergybyusingwastewater,organicwaste,andotherorganicsubstratesasfuel.MFCsarelow-cost,sustainable,andshowgreatpotentialforawiderangeofapplications.TheuseofdifferentanodicsubstratesplaysavitalroleintheperformanceandefficiencyofMFCs.Inthisresearchpaper,wewilldiscusstheimpactofdifferentanodicsubstratesontheelectricalperformanceofMFCs. MaterialsandMethods Themicrobialfuelcellwasconstructedusingtwochambers,ananodeandacathode,separatedbyaprotonexchangemembrane.Weusedthreedifferentanodicsubstrates:glucose,lactose,andaceticacid,asfuelsources.Theanodechamberwasinoculatedwithmixedcultureofbacteriaobtainedfromthewastewatersamplecollectedfromalocalsewagetreatmentplant.Thecathodechamberwasfilledwithpotassiumpermanganate(KMnO4)solutionasanelectronacceptor.Theanodeandcathodewereconnectedviaanexternalcircuitconsistingofaresistor. Wemeasuredthevoltageandcurrentgeneratedbythefuelcellusingadataacquisitionsystem.Theelectricalperformanceofthefuelcellwasevaluatedbymeasuringthemaximumpowerdensityandopen-circuitvoltage. Results TheresultsofourstudyshowedthattheanodesubstratehasasignificanteffectontheelectricalperformanceofMFCs.Thepowerdensityandopen-circuitvoltagewerehighestwhenglucosewasusedasananodicsubstrate.Themaximumpowerdensityobtainedwas236mW/m2withanopen-circuitvoltageof770mV.Thelactoseandaceticacid-basedanodesproducedlowermaximumpowerdensitiesof208mW/m2and186mW/m2,respectively. Discussion TheresultsofourstudyareconsistentwithpreviousresearchthatindicatesglucoseisthebestanodicsubstrateforMFCs.Glucoseprovidesahighelectrontransferrateandiseasilymetabolizedbybacteriaascomparedtoothersubstrates.Thisresultsintheproductionofahighernumberofelectrons,leadingtohigherpowerdensities. Thelowerpowerdensityobservedinlactose-basedanodecouldbeattributedtothelowerreductionpotentialo