Self-Assembled TiO2-Graphene Hybrid Nanostructures for Enhanced Li-Ion Insertion
Self-Assembled TiO2-Graphene Hybrid Nanostructures for Enhanced Li-Ion Insertion
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DOI：
10.1021/nn900150y
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发表时间：
2009-04-01
期刊：
影响因子：
17.1
通讯作者：
Liu, Jun
中科院分区：
文献类型：
--
作者：
Wang, Donghai;Choi, Daiwon;Liu, Jun
我们使用阴离子硫酸盐表面活性剂来帮助石墨烯在水溶液中的稳定化，并促进原位生长的纳米晶TiO 2（金红石和锐钛型）与石墨烯的自组装。这些纳米结构的TiO 2-石墨烯杂化材料用于锂离子插入性能的调查。混合材料显示出显着增强的锂离子插入/提取二氧化钛。在高充电速率下，与纯TiO 2相相比，比容量增加了一倍以上。在高充电-放电速率下的改善的容量可以归因于在嵌入金属氧化物电极中的石墨烯化的石墨烯网络的存在下增加的电极电导率。
We used anionic sulfate surfactants to assist the stabilization of graphene in aqueous solutions and facilitate the self-assembly of in situ grown nanocrystalline TiO2, rutile and anatase, with graphene. These nanostructured TiO2-graphene hybrid materials were used for investigation of Li-ion insertion properties. The hybrid materials showed significantly enhanced Li-ion insertion/extraction in TiO2. The specific capacity was more than doubled at high charge rates, as compared with the pure TiO2 phase. The improved capacity at high charge-discharge rate may be attributed to increased electrode conductivity in the presence of a percolated graphene network embedded into the metal oxide electrodes.