双阴极mfc启动过程中的电化学特性

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1、双明极MFC启动过程中的电化学特性张建民魏佳齐崔心水薛瑶安工程大学环境与化学工程学院长安大学环境科学与工程学院构建以污水处理厂二沉池污泥接种的双阴极微生物燃料电池（MFC），用循环伏安法（CV）、交流阻抗法（EIS）表征了MFC启动阶段的电化学特性。结果表明:经过3个周期的运行，输出电压稳定，反应器启动成功，启动阶段厌氧-好氧和厌氧-缺氧部分输出电压的最大值分别为175和336mV。缺氧阴极，厌氧阳极电极生物膜CV检测中出现氧化还原峰，随着启动时间的增加，其峰值电流逐渐增大;而好氧阴极电极生物膜的CV检测结果屮未出现明显的氧化还原峰。悬浮污泥的CV检测结果

2、中出现了成对的氧化还原峰，表明生物代谢过程中有电子中介体产生。E1S结果说明电极的欧姆内阻和扩散内阻基本保持不变，极化内阻在不断减小，很好地反映了产电微生物在电极上富集的过程。启动成功后缺氧、厌氧和好氧电极的极化内阻值分别为2.86、2.33和57.640，好氧阴极极化内阻值较大，表明其电极生物膜催化能力较弱。关键词：双阴极MFC;启动;电化学;循环伏安法;交流阻抗法;收稿曰期:2017-05-10基金：陕西省教育厅专项科研计划项目（2013JK0887）ElectrochemicalcharacterizationofdualcathodeMFCduri

3、ngstart-upphaseZHANGTianminWEITiaaiGUIXinshuiXUEYaoSchoolofEnvironmentandChemistrvEngineering,Xi/anPolytechnicUniversity;Abstract：Inthisstudy,theconstructionoftheexperimentwasbasedonthedoublecathodemicrobialfuelcell(MFC)，whichwasinoculatedwiththesecondsedimentationtankofsewagetrea

4、tmentplant.Asforthestart-upstage,theelectrochemicalcharacteristicsofMFCwerecharacterizedbycyclicvoltammetry(CV)andelectro-chemicalimpedancespectroscopy(EIS)methods.Theresultsindicatedthattheoutputvoltageisstableafterthreecyclesofoperation.Thus,thereactorisstartedsuccessfully.Andth

5、emaximumvaluesare175and336mV,correspondingtoanaerobic-aerobicandanaerobic-hypoxiaforoutputvoltagesinthestart-upphase.AsfortheCVmethod,theredoxpeakscanbeclearlyobservedinthedetectionoftheelectrodebiofilmsofhypoxiccathodesandanaerobicanodes.Inaddition,thecurrentofthepeakincreasesgra

6、duallywiththestart-uptimein-creases.However,thereisnosignificantredoxpeakdetectedintheaerobiccathodebiofi1ms.Andtheseveralpairsofredoxpeakscanbedetectedinthesuspendedsludge,whichconfirmedthatthebio-metabolicprocessesproduceelectronicintermediates.AccordingtotheEISmethod,theresults

7、shownthattheohmicresistanceanddiffusionresistanceoftheelectroderemainunchanged.Atthesametime,itspolarizationresistanceisreducedcontinuouslywhichrevealedwellthatmicroorganismenrichmentprocessonelectrodes.What’sremarkableisthechangeofthepolarizationresistanceoftheelectrodeafterthere

8、actorisstartedsuccessfully.Itsval