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【目的】利用石墨烯与多壁碳纳米管复合材料协同刃天青修饰微生物燃料电池(Microbial fuel cell,MFC)阳极,提高MFC的运行性能。【方法】以碳布为基底,采用滴涂法分别制备了刃天青/碳布(R/CC)、刃天青+石墨烯/碳布(R+GNS/CC)、刃天青+多壁碳纳米管/碳布(R+MWCNT/CC)、刃天青+石墨烯+多壁碳纳米管/碳布(R+GNS+MWCNT/CC)四种阳极材料。【结果】在降解高氯酸盐的过程中,与刃天青/碳布(最高输出电压54 m V)相比,刃天青+石墨烯/碳布、刃天青+多壁碳纳米管/碳布和刃天青+石墨烯+多壁碳纳米管/碳布阳极MFC最高输出电压分别为87、145、275 m V,分别提高了61.11%、168.52%、409.26%;高氯酸盐的还原速率也分别提高了59.1%、89.7%、147.3%。4种阳极的电化学交流阻抗(EIS)和塔菲尔(Tafel)测试发现,与刃天青/碳布阳极相比,刃天青+石墨烯/碳布、刃天青+多壁碳纳米管/碳布阳极活化内阻减小,电极反应速率提高,但刃天青+石墨烯+多壁碳纳米管/碳布阳极的活化内阻更小,电极反应速率更快,同时4种阳极附着微生物胞外聚合物(EPS)分析表明,修饰过的阳极附着微生物数量增加,多糖减少,R+GNS+MWCNT/CC阳极变化最大,更有利于微生物传递电子。【结论】石墨烯、多壁碳纳米管复合材料协同刃天青修饰MFC阳极可以减小活化内阻从而加快电子传递,进而提高MFC的性能。
【Objective】 Microbial fuel cell (MFC) anode was modified with graphene and multi-walled carbon nanotube composites to improve the operating performance of MFC. 【Method】 The carbon black was used as the substrate to prepare the R / CC, R + GNS / CC, Carbon nanotubes / carbon cloth (R + MWCNT / CC), resazurin + graphene + multi-walled carbon nanotubes / carbon cloth (R + GNS + MWCNT / CC) four anode material. 【Result】 Compared with resazurin / carbon cloth (maximum output voltage of 54 mV), the resazurin + graphene / carbon cloth, resazurin + multi-walled carbon nanotubes / Carbon cloth and resazurin + graphene + multi-walled carbon nanotubes / carbon cloth anode MFC maximum output voltage was 87,145,275 m V, respectively, increased by 61.11%, 168.52%, 409.26%; perchlorate Reduction rate also increased by 59.1%, 89.7%, 147.3%. Electrochemical AC Impedance (EIS) and Tafel tests of the four anodes showed that, compared to the resazurin / carbon cloth anode, resazurin + graphene / carbon cloth, resazurin + multi-walled carbon nano The internal resistance of the tube / carbon cloth anode was reduced and the electrode reaction rate was improved, but the activation resistance of the resazurin + graphene + multi-walled carbon nanotubes / carbon cloth anode was smaller and the electrode reaction rate was faster. Meanwhile, The analysis of extracellular polymeric substances (EPS) showed that the number of modified anodic attached microorganisms increased, polysaccharide decreased, and the maximum change of R + GNS + MWCNT / CC anodes was more conducive to the transfer of electrons by microorganisms. 【Conclusion】 The graphene and multi-walled carbon nanotube composites combined with resazurin-modified MFC anode can reduce the activation resistance and accelerate the electron transfer, thus improving the performance of MFC.