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Enhanced catalytic capability of electroactive biofilm modified with different kinds of carbon nanotubes
Analytica Chimica Acta ( IF 6.2 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.aca.2018.06.077
Zhaohong Jiang , Di Zhang , Lei Zhou , Dandan Deng , Min Duan , Ying Liu

In this study two methods including coating carbon nanotubes (CNTs) layers on the electrode surface and adding CNTs-suspension during electrochemically active biofilms (EABs) growth were used, respectively, to develop CNTs hybrid EABs for enhancing electricity generation capability of EABs. EABs growth on the CNTs with functional groups of hydroxyl (CNTs-OH) or carboxyl (CNTs-COOH) and pristine CNTs without functionalization (P-CNTs) modified electrode was investigated. The maximum current densities of EABs growth on the P-CNTs, CNTs-OH and CNTs-COOH coated electrode were respective 1300 ± 117, 1082 ± 54 and 1124 ± 78 μA cm-2, which were much higher than unmodified electrode (663 μA cm-2). Meanwhile, EABs growth in doping CNTs-COOH or CNTs-OH suspensions system also produced twice higher current density than that on unmodified electrode. These results indicated that the current production of EABs can be significantly enhanced by coating P-CNTs, CNTs-OH, CNTs-COOH layers on the electrode surface or doping CNTs-OH and CNTs-COOH suspension into EABs. Furthermore, morphology analysis of as-obtained EABs had also been studied. It was found that there was no significant difference of the morphological characteristic for EABs growth on different types CNTs coated electrode surface. By comparison, a nano-hybrid porous structure of CNTs and EABs was observed when CNTs-COOH or CNTs-OH suspension was added into the medium during EABs growth, which will be responsible for high current generation.

中文翻译:

不同种类碳纳米管修饰的电活性生物膜的催化能力增强

在这项研究中,分别使用两种方法,包括在电极表面涂覆碳纳米管 (CNT) 层和在电化学活性生物膜 (EAB) 生长过程中添加 CNT 悬浮液,以开发 CNT 混合 EAB,以提高 EAB 的发电能力。研究了 EAB 在具有羟基 (CNTs-OH) 或羧基 (CNTs-COOH) 官能团的 CNT 和未经功能化的原始 CNT (P-CNT) 修饰电极上的生长。EABs 在 P-CNTs、CNTs-OH 和 CNTs-COOH 涂层电极上生长的最大电流密度分别为 1300±117、1082±54 和 1124±78 μA cm-2,远高于未修饰电极(663 μA厘米-2)。同时,EABs 在掺杂 CNTs-COOH 或 CNTs-OH 悬浮液系统中的生长也产生了比未修饰电极高两倍的电流密度。这些结果表明,通过在电极表面涂覆 P-CNTs、CNTs-OH、CNTs-COOH 层或将 CNTs-OH 和 CNTs-COOH 悬浮液掺杂到 EABs 中,可以显着提高 EABs 的当前产量。此外,还研究了获得的 EAB 的形态分析。发现在不同类型的碳纳米管涂覆的电极表面上,EABs 生长的形态特征没有显着差异。相比之下,当在 EABs 生长过程中将 CNTs-COOH 或 CNTs-OH 悬浮液添加到培养基中时,观察到 CNTs 和 EABs 的纳米混合多孔结构,这将负责产生高电流。电极表面上的 CNTs-COOH 层或将 CNTs-OH 和 CNTs-COOH 悬浮液掺杂到 EAB 中。此外,还研究了获得的 EAB 的形态分析。发现在不同类型的碳纳米管涂覆的电极表面上,EABs 生长的形态特征没有显着差异。相比之下,当在 EABs 生长过程中将 CNTs-COOH 或 CNTs-OH 悬浮液添加到培养基中时,观察到 CNTs 和 EABs 的纳米混合多孔结构,这将负责产生高电流。电极表面上的 CNTs-COOH 层或将 CNTs-OH 和 CNTs-COOH 悬浮液掺杂到 EAB 中。此外,还研究了获得的 EAB 的形态分析。发现在不同类型的碳纳米管涂覆的电极表面上,EABs 生长的形态特征没有显着差异。相比之下,当在 EABs 生长过程中将 CNTs-COOH 或 CNTs-OH 悬浮液添加到培养基中时,观察到 CNTs 和 EABs 的纳米混合多孔结构,这将负责产生高电流。
更新日期:2018-12-01
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