Carbon-Based Supercapacitors Produced by Activation of Graphene
Carbon-Based Supercapacitors Produced by Activation of Graphene
复制标题
DOI：
10.1126/science.1200770
复制
发表时间：
2011-06-24
期刊：
影响因子：
56.9
通讯作者：
Ruoff, Rodney S.
中科院分区：
文献类型：
--
作者：
Zhu, Yanwu;Murali, Shanthi;Ruoff, Rodney S.
超级电容器，也称为超级电容器或电化学电容器，在高表面积导电材料上存储电荷。它们的广泛使用受到其低能量存储密度和相对高的有效串联电阻的限制。使用膨胀氧化石墨的化学活化，我们合成了具有高达3100平方米/克的Brunauer-Emmett-Teller表面积、高电导率以及低氧和氢含量的多孔碳。这种sp（2）键合的碳具有高度弯曲的连续三维网络，原子厚的壁主要形成0.6至5纳米宽的孔。用这种碳构建的双电极超级电容器电池在有机和离子液体电解质的情况下产生高的重量电容和能量密度值。用于制造这种碳的工艺很容易扩展到工业水平。
Supercapacitors, also called ultracapacitors or electrochemical capacitors, store electrical charge on high-surface-area conducting materials. Their widespread use is limited by their low energy storage density and relatively high effective series resistance. Using chemical activation of exfoliated graphite oxide, we synthesized a porous carbon with a Brunauer-Emmett-Teller surface area of up to 3100 square meters per gram, a high electrical conductivity, and a low oxygen and hydrogen content. This sp(2)-bonded carbon has a continuous three-dimensional network of highly curved, atom-thick walls that form primarily 0.6- to 5-nanometer-width pores. Two-electrode supercapacitor cells constructed with this carbon yielded high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes. The processes used to make this carbon are readily scalable to industrial levels.