Performance of electro-spun carbon nanofiber electrodes with conductive poly(3,4-ethylenedioxythiophene) coatings in bioelectrochemical systems
Performance of electro-spun carbon nanofiber electrodes with conductive poly(3,4-ethylenedioxythiophene) coatings in bioelectrochemical systems
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DOI：
10.1016/j.jpowsour.2017.03.133
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发表时间：
2017-06-15
影响因子：
9.2
通讯作者：
Angenent, Largus T.
中科院分区：
文献类型：
--
作者：
Guzman, Juan J. L.;Kara, Meryem O. Pehlivaner;Angenent, Largus T.
生物电化学系统(BESS)利用生长在电极上的细菌的胞外电子转移。由于生物膜和电极的限制，工业规模的应用需要很大的电极面积，因此需要廉价的电极材料。在这里，我们制备了电纺聚丙烯腈(PAN)和碳纳米纤维(CNF)。此外，还将导电聚合物聚(3，4-乙二氧基噻吩基)(PEDOT)作为涂层应用于这些材料和碳布(CC)。我们通过物理化学测量、循环伏安法和硫还原地杆菌的生物电化学生长研究对这些材料作为电极进行了测试。PAN是一种没有电容的非导电材料，但有了PEDOT涂层，其导电性和电容足以支持我们的BES中的电流产生。CNF在电容方面优于CC，但当归一化到投影表面积时，CNF在BES中的表现类似。有了PEDOT涂层，CNF使我们的BES的电流产量增加了38%，而CC的电流产量增加了%。当应用于金微流控电极时，硫还原剂的电流增加了近三倍。PEDOT为具有低比表面积的电极增加了相当大的比表面积，但不具有像CNF那样的高比表面积。这项工作表明，电纺电极和PEDOT涂层是一种很有前途的电极替代方案，可以很容易地应用到现有的BESS中。(C)2017爱思唯尔B.V.保留所有权利。
Bioelectrochemical systems (BESs) employ extracellular electron transfer from bacteria that grow at electrodes. Due to biofilm and electrode limitations, industrial-scale applications require large electrode areas, and thus inexpensive electrode materials. Here, electro-spun polyacrylonitrile (PAN) and carbon nanofiber (CNF) were manufactured. In addition, the conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) was applied as a coating to these materials and to carbon cloth (CC). We tested these materials as electrodes by using physicochemical measurements, cyclic voltammetry, and bioelectrochemical growth-studies with Geobacter sulfurreducens. PAN is a nonconductive material without capacitance, but with PEDOT coating the conductivity and capacitance became sufficient to support electric current production in our BES. CNF outperformed CC in capacitance, but behaved similarly in our BES when normalized to projected surface area. With the PEDOT coating, CNF increased electric current production by 38% in our BES, while this was 64% for CC. When applied to a gold microfluidic electrode, electric current with G. sulfurreducens increased almost three-fold. PEDOT added considerable specific surface area to electrodes possessing a low surface area, but not with a high surface area such as CNF. This work demonstrates that electro-spun electrodes and PEDOT coating are a promising electrode alternative that can be readily implemented into existing BESs. (C) 2017 Elsevier B.V. All rights reserved.