New Graphene Form of Nanoporous Monolith for Excellent Energy Storage
New Graphene Form of Nanoporous Monolith for Excellent Energy Storage
复制标题
新型石墨烯纳米多孔整体材料可实现出色的能量存储
DOI：
10.1021/acs.nanolett.5b03923
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发表时间：
2016-01-01
期刊：
影响因子：
10.8
通讯作者：
Huang, Fuqiang
中科院分区：
文献类型：
--
作者：
Bi, Hui;Lin, Tianquan;Huang, Fuqiang
具有四面体连接共价结构的特殊管状石墨烯蜂窝材料是最近被发现的一种新型超材料，具有超轻、超硬、超弹性和优异的导电特性，但高比表面积将阻碍其在下一代储能应用中的应用。在这里，我们制备了另一种新的石墨烯整体，它是由介孔石墨烯填充的管子代替已报道的胞状结构中的中空管子。这种石墨烯纳米孔整体柱还由共价键合的碳网络组成，具有类似1590m(2)g(-1)的高比表面积和类似于32 S cm(-1)的电导率，优于石墨烯气凝胶和由氧化石墨烯自组装形成的多孔石墨烯。这种3D石墨烯整体可支撑其自身重量的10000倍以上，明显优于碳纳米管和密度相近的石墨烯蜂窝材料。此外，还将伪电容活性官能团引入到新型纳米多孔石墨烯整体柱中，作为电化学电容器的电极材料。令人惊讶的是，3D介孔石墨烯电极的比容为303Fg(-1)，10000次循环后保持了98%以上的保持率，属于最佳碳基活性材料。宏观介孔石墨烯整体显示出在储能领域作为超级电容器电极的巨大潜力。
Extraordinary tubular graphene cellular material of a tetrahedrally connected covalent structure was very recently discovered as a new supermaterial with ultralight, ultrastiff, superelastic, and excellent conductive characteristics, but no high specific surface area will keep it from any next-generation energy storage applications. Herein, we prepare another new graphene monolith of mesoporous graphene-filled tubes instead of hollow tubes in the reported cellular structure. This graphene nanoporous monolith is also composed of covalently bonded carbon network possessing high specific surface area of similar to 1590 m(2) g(-1) and electrical conductivity of similar to 32 S cm(-1), superior to graphene aerogels and porous graphene forms self-assembled by graphene oxide. This 3D graphene monolith can support over 10 000 times its own weight, significantly superior to CNT and graphene cellular materials with a similar density. Furthermore, pseudocapacitance-active functional groups are introduced into the new nanoporous graphene monolith as an electrode material in electrochemical capacitors. Surprisingly, the electrode of 3D mesoporous graphene has a specific capacitance of 303 F g(-1) and maintains over 98% retention after 10 000 cycles, belonging to the list for the best carbon-based active materials. The macroscopic mesoporous graphene monolith suggests the great potential as an electrode for supercapacitors in energy storage areas.