Enhanced microbial electrosynthesis with three-dimensional graphene functionalized cathodes fabricated via solvothermal synthesis
Enhanced microbial electrosynthesis with three-dimensional graphene functionalized cathodes fabricated via solvothermal synthesis
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DOI：
10.1016/j.electacta.2016.09.063
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发表时间：
2016-11-01
影响因子：
6.6
通讯作者：
Zhang, Tian
中科院分区：
文献类型：
--
作者：
Aryal, Nabin;Halder, Arnab;Zhang, Tian
CO2生物还原为多碳化合物可以通过来自生物电化学反应器阴极的电子经由微生物电合成（MES）驱动。为了提高MES生产率，必须实现阴极和微生物催化剂之间的最佳电子转移条件。在这里，我们报告了一种3D石墨烯功能化碳毡复合阴极的开发，该阴极能够在MES反应器中更快地将电子转移到微生物催化剂Sporomusa ovata。用3D石墨烯网络修饰使从CO2电合成乙酸酯的速率提高了6.8倍。它还显著提高了生物膜密度和电流消耗。与未处理的对照相比，3D-石墨烯/碳毡复合阴极的比表面积增加2倍，部分解释了更实质性的生物膜的形成。此外，在循环伏安分析中，3D-石墨烯/碳毡复合阴极表现出更高的电流响应。结果表明，三维网络阴极的发展是一种有效的方法，以改善微生物-电极相互作用，导致生产MES系统。(C)2016爱思唯尔有限公司版权所有
The biological reduction of CO2 into multicarbon chemicals can be driven by electrons derived from the cathode of a bioelectrochemical reactor via microbial electrosynthesis (MES). To increase MES productivity, conditions for optimal electron transfer between the cathode and the microbial catalyst must be implemented. Here, we report the development of a 3D-graphene functionalized carbon felt composite cathode enabling faster electron transfer to the microbial catalyst Sporomusa ovata in a MES reactor. Modification with 3D-graphene network increased the electrosynthesis rate of acetate from CO2 by 6.8 fold. It also significantly improved biofilm density and current consumption. A 2-fold increase in specific surface area of the 3D-graphene/carbon felt composite cathode explained in part the formation of more substantial biofilms compared to untreated control. Furthermore, in cyclic voltammetry analysis, 3D-graphene/carbon felt composite cathode exhibited higher current response. The results indicate that the development of a 3D-network cathode is an effective approach to improve microbe-electrode interactions leading to productive MES systems. (C) 2016 Elsevier Ltd. All rights reserved.