阳极
材料科学
静电纺丝
微生物燃料电池
纳米纤维
电子转移
化学工程
电催化剂
碳纳米管
纳米技术
地杆菌
电化学
生物膜
电极
复合材料
化学
聚合物
光化学
细菌
工程类
生物
物理化学
遗传学
作者
Yuanfeng Liu,Guangming Zhou,Yaxin Sun,Min Zhang,Tingli Ren,Le Wang,Congju Li
标识
DOI:10.1016/j.apsusc.2022.155386
摘要
Currently, the commercial applications of MFCs are mainly constricted by the relatively lower power density derived from poor electroactive bacteria (EAB) adhesion and sluggish extracellular electron transfer (EET) at the anode interface. To address this issue, herein, hollow cobalt ferrite nanofibers integrating with carbon nanotubes (CoFe2O4/CNTs) are fabricated as an efficient anode electrocatalyst via simple electrospinning, pyrolysis, and in-situ hybrid process. Interestingly, the CoFe2O4/CNTs electrocatalysts with a continuously interconnected network not only strengthen the interfacial affinity with EAB but also promote the electron transfer efficiency between the anode and EAB, which endows the MFCs with a maximum power density of 2290 mW m−2, far exceeding the referential CoFe2O4 (1458 mW m−2) and carbon cloth (496.7 mW m−2) anode. The outstanding power density can be attributed to the continuous porous scaffold, remarkable electrocatalytic activity toward the redox reactions in the biofilm, and positively charged cations with multiple valence states on the CoFe2O4/CNTs electrocatalyst, favoring the negatively charged Geobacter adhesion, colonization, and mediating long-distance EET across the thick biofilm. This research provides a new strategy for fabricating anode electrocatalysts to improve the overall MFCs performance.
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