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微生物燃料电池——是福还是祸

摘要

微生物燃料电池利用废弃碳水化合物作为燃料。它具有不使用催化剂或质子交换膜的特性，因此它是处理废物的环保材料。生物燃料电池将化学能直接转化为电能。它们是轻的，因为它们在非常温和的条件下起作用，如环境温度、压力和廉价的催化剂，即微生物或酶。该电池在阳极室使用粪肥污泥和含有溶解氧的含水盐溶液。阳极和阴极的位置对燃料电池的功率性能影响很大。微生物燃料电池有两种类型，即介质燃料电池和无介质燃料电池。该电池获得的最大功率密度为4.21 W/m2。研究人员还报道了一种利用酸奶细菌和亚甲基蓝作为介质的介导燃料电池。最大功率密度大于13w /m2。 Enriched anodic biofilms have generated power densities of as high as 6.9 W/m2. A drawback with redox enzymes in MFCs is that they cannot take part in direct transfer of electrons with conducting supports hence use mediator are used for the electrical connection of the biocatalyst and the electrode. Several methods are utilised to functionalise the electrode surface with layers consisting of redox enzymes, electro catalysts and biocatalysts that promote electrochemical transformation at the electrode interface. Microorganisms that require a mediator do not have electrochemically active surface proteins to transfer electrons to anode electrode. MFCs that do not use mediator require some more carbohydrates to functions. Metal reducing bacteria example Geobacteraceae family and shewanella genus are mainly used for this type of mediator less fuel cell.

要不是Behera

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