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化工学报  2015 

微生物燃料电池MnO2/S-AC泡沫镍空气阴极的制备及其性能

DOI: 10.11949/j.issn.0438-1157.20150298, PP. 202-208

Keywords: 微生物燃料电池,空气阴极,电化学,催化剂,MnO2,活性炭

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Abstract:

利用超级电容器活性炭(S-AC)直接还原KMnO4制备出复合比例分别为1:3、1:1和3:1的MnO2/S-AC复合催化剂,进而负载于泡沫镍上制得MnO2/S-AC泡沫镍空气阴极。通过X射线衍射(XRD)、扫描电镜(SEM)、能量散射X射线谱(EDX)和比表面积(BET)及孔分布测试对所制复合催化剂表征可知,随复合比例的增加,在S-AC表面的MnO2由纳米薄片聚集成粒径为300~500nm的颗粒,MnO2/S-AC的内部及外部表面积都有所减少。基于线性扫描伏安曲线、功率密度曲线和极化曲线分析微生物燃料电池(MFC)的阴极性能和产电性能。复合比例为1:3时,MFC最大功率密度达到321.2mW·m-2,比阴极负载S-AC时提高了约20%,这与其较高的比表面积和MnO2良好的催化活性相关。MnO2/S-AC复合催化剂控制在一定的质量比时,可以有效提高阴极性能及MFC的产电效果,有助于空气阴极MFC的的放大和工程应用。

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