Manganese dioxide-coated carbon nanotubes as an improved cathodic catalyst for oxygen reduction in a microbial fuel cell
Manganese dioxide-coated carbon nanotubes as an improved cathodic catalyst for oxygen reduction in a microbial fuel cell
复制标题
二氧化锰涂层碳纳米管作为微生物燃料电池中氧还原的改进阴极催化剂
DOI：
10.1016/j.jpowsour.2011.07.069
复制
发表时间：
2011-11-15
影响因子：
9.2
通讯作者：
Hou, Bin
中科院分区：
文献类型：
--
作者：
Zhang, Yaping;Hu, Yongyou;Hou, Bin
为了开发一种高效、经济的微生物燃料电池阴极电催化剂，采用原位水热法在碳纳米管表面包覆二氧化锰（in-situ MnO 2/CNTs），研究了其电化学氧还原反应（ORR）.通过透射电子显微镜的检查表明，MnO 2是充分和均匀地分散在碳纳米管的表面。使用线性扫描伏安法，我们确定，在原位二氧化锰/碳纳米管是一个更好的催化剂的ORR比碳纳米管，简单地机械混合与二氧化锰粉末，这表明表面涂层的二氧化锰到碳纳米管增强其催化活性。此外，原位MnO 2/CNTs阴极MFC的最大功率密度为210 mW m（-2），是机械混合MnO 2/CNTs MFC的2.3倍（93 mW m（-2）），与传统Pt/C阴极MFC的最大功率密度（229 mW m（-2））相当。电化学阻抗谱分析表明，均匀的表面分散的MnO 2的碳纳米管增强的ORR的电子转移，导致更高的MFC功率输出。本研究的结果表明，碳纳米管是一个理想的催化剂载体二氧化锰和原位二氧化锰/碳纳米管提供了一个很好的替代Pt/C的实际MFC应用。(C)2011爱思唯尔有限公司版权所有。
To develop an efficient and cost-effective cathodic electrocatalyst for microbial fuel cells (MFCs), carbon nanotubes (CNTs) coated with manganese dioxide using an in situ hydrothermal method (in situ MnO2/CNTs) have been investigated for electrochemical oxygen reduction reaction (ORR). Examination by transmission electron microscopy shows that MnO2 is sufficiently and uniformly dispersed over the surfaces of the CNTs. Using linear sweep voltammetry, we determine that the in situ MnO2/CNTs are a better catalyst for the ORR than CNTs that are simply mechanically mixed with MnO2 powder, suggesting that the surface coating of MnO2 onto CNTs enhances their catalytic activity. Additionally, a maximum power density of 210 mW m(-2) produced from the MFC with in situ MnO2/CNTs cathode is 2.3 times of that produced from the MFC using mechanically mixed MnO2/CNTs (93 mW m(-2)), and comparable to that of the MFC with a conventional Pt/C cathode (229 mW m(-2)). Electrochemical impedance spectroscopy analysis indicates that the uniform surface dispersion of MnO2 on the CNTs enhanced electron transfer of the ORR, resulting in higher MFC power output. The results of this study demonstrate that CNTs are an ideal catalyst support for MnO2 and that in situ MnO2/CNTs offer a good alternative to Pt/C for practical MFC applications. (C) 2011 Elsevier B.V. All rights reserved.