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电化学  2013 

微生物阳极燃料电池极性反转现象研究

, PP. 376-382

Keywords: 微生物阳极燃料电池,极性反转,阳极极化

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Abstract:

本文在构建出微生物阳极燃料电池系统的基础上,研究了微生物燃料电池极性反转现象.实验表明,由活性污泥混合菌源接种的微生物阳极在电极表面形成电化学生物膜,但平行构建的微生物阳极燃料电池系统在内阻、输出电压和放电时长等方面存在着不同程度差异.在串联微生物燃料电池组中,放电操作会导致性能较差的微生物单电池首先出现极性反转.电极电势测量表明,较高的放电电流使微生物阳极电势迅速正移,导致电池系统出现极性反转.在室温范围内,温度升高可使MFC承受较高的放电电流,不易发生极化.燃料物质缺乏时,MFC易发生极性反转,但过高的电流仍能使燃料物质充分的MFC出现极性反转.MFC极性反转会对微生物阳极性能造成影响.极性反转时间较短(<5min),对微生物阳极影响不大,但延长极性反转时间,会导致微生物阳极性能下降.

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