基于铁修饰碳纳米纤维阳极的微生物燃料电池

Microbial fuel cell based on iron modified carbon nanofiber anode

本文用乙酰丙酮铁作为铁源,利用静电纺丝和简单高温碳化制备了铁修饰碳纳米纤维(Fe@CNF)并应用于希瓦氏菌微生物燃料电池以促进阳极界面电子传递过程。结果表明铁修饰后的碳纳米纤维上具有2~10 nm的孔隙,因而比表面积较未修饰的纤维显著提高,能够为界面电化学反应提供更多活性位点。此外,Fe@CNF中低价态铁元素含量随着前驱体中铁源含量的增加而增多,最终铁含量较高的Fe@CNF-Ⅲ阳极在微生物燃料电池中获得最佳性能,电化学分析数据及电极形貌观察揭示其原因可能是低价态铁含量的增加促进了电极表面电活性生物膜的形成以及希瓦氏菌与电极间的界面电子传递。

Iron modified carbon nanofibers(Fe@CNF)were prepared by electrospinning and simple high temperature carbonization with iron acetylacetonate as iron source.The Fe@CNFs were applied to Shewanella S.putrefaciens CN32 microbial fuel cells to promote the interfacial electron transfer process in anode.The results show that the Fe@CNFs possess nanopores of 2~10 nm,which significantly increases the specific surface area so that they can provide more active sites for interfacial electrochemical reaction.In addition,the content of low valent iron in Fe@CNFs increases with the increase of iron source content in the precursor.As a result,the Fe@CNF-III anode that containing highest ratio of low valent iron obtains the best performance in microbial fuel cells.Electrochemical analysis data and electrode morphology observation reveal that the reason may be that the increase of low valent iron content promotes the formation of electroactive biofilm on the electrode surface and the interfacial electron transfer between S.putrefaciens CN32 cells and the electrode.