Crumpled graphene particles for microbial fuel cell electrodes
Crumpled graphene particles for microbial fuel cell electrodes
复制标题
DOI：
10.1016/j.jpowsour.2012.02.036
复制
发表时间：
2012-06
影响因子：
9.2
通讯作者：
Li Xiao;Jacqueline Damien;Jiayan Luo;H. Jang;Jiaxing Huang;Zhen He
中科院分区：
文献类型：
--
作者：
Li Xiao;Jacqueline Damien;Jiayan Luo;H. Jang;Jiaxing Huang;Zhen He
石墨烯在微生物燃料电池（MFC）电极的制备和修饰方面具有广阔的应用前景，但目前对石墨烯在MFC中的应用研究较少。本研究系统地研究了两种形态非常不同的石墨烯材料，即规则石墨烯（如扁平的纸张）和皱褶颗粒（如皱褶的纸球），分别用于修饰mfc的阳极和阴极电极。由于石墨烯颗粒在厚度方向上具有更高的导电性、更大的表面积、氧还原的催化活性，以及它们包裹的开放结构有利于燃料和离子的质量传递，因此卷曲石墨烯颗粒的发电量更高。石墨烯修饰的阳极电极产生最高的最大功率密度（3.6Wm−3），是活性炭修饰阳极电极（1.7Wm−3）的两倍。石墨烯修饰和石墨烯修饰的最大功率密度分别为3.3Wm−3和2.5Wm−3，显著高于未修饰碳布的0.3Wm−3，但仍低于铂阴极电极。这些结果表明，石墨烯基材料，特别是皱巴巴的石墨烯颗粒，可以作为有效的电极修饰材料，改善mfc的发电性能。
Graphene has a promising role in electrode fabrication/modification for microbial fuel cell (MFC) applications but there is a lack of research on graphene in MFCs. This study has systematically investigated two types of graphene materials with very different morphologies, namely regular graphene (like flat sheets of paper) and crumpled particles (like crumpled paper balls), respectively, to modify anode and cathode electrodes in MFCs. The higher electricity generation with the crumpled graphene particles is attributed to their higher electrical conductivity in the thickness direction, their larger surface area, catalytic activities of oxygen reduction, and the open structure they pack into that facilitates mass transfer of the fuels and ions. The crumpled graphene-modified anode electrode produces the highest maximum power density (3.6Wm−3), twice that of the activated carbon-modified anode electrode (1.7Wm−3). The maximum power densities with the crumpled graphene- and flat graphene-modified cathode electrodes are 3.3Wm−3and 2.5Wm−3, significantly higher than 0.3Wm−3with the unmodified carbon cloth, although still lower than a platinum cathode electrode. These results have demonstrated that graphene-based materials, especially the crumpled graphene particles, can be effective electrode modifying materials for improving electricity generation in MFCs.