用于锂离子电池的具有高倍率和长期性能的金红石型二氧化钛介晶/还原氧化石墨烯
Rutile TiO2 mesocrystals/reduced graphene oxide with high-rate and long-term performance for lithium-ion batteries.
作者信息
Lan Tongbin, Qiu Heyuan, Xie Fengyan, Yang Jie, Wei Mingdeng
机构信息
1] State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou, Fujian. 350002, China [2] Institute of Advanced Energy Materials, Fuzhou University, Fuzhou, Fujian. 350002, China.
出版信息
Sci Rep. 2015 Feb 17;5:8498. doi: 10.1038/srep08498.
An in situ hydrothermal route is developed for fabricating rutile TiO2 mesocrystals/reduced graphene oxide nanosheets (TGR) hybrids in the presence of dodecylbenzenesulphonic acid (ADBS). These rutile TiO2 mesocrystals with a Wulff shape are composed of ultra-tiny rod-like subunits with the same oriented direction and closely wrapped by the nanosheets of reduced graphene oxide (RGO). It is found that ADBS played a key role for the formation of mesocrystals during the self-assembly process, which pillared the graphene oxide (GO) nanosheets and involved the aggregation of the mesocrystal subunits. Furthermore, the TGR hybrids are used as an anode material and exhibited a large capacity over 150 mA h g(-1) at 20 C after 1000 cycles, and high rate capability up to 40 C. These high performance characteristics may be due to the intrinsic characteristics of rutile TiO2 mesocrystals constructed from ultra-tiny subunits and hybridized with super conductive RGO nanosheets.
开发了一种原位水热法，用于在十二烷基苯磺酸（ADBS）存在下制备金红石型TiO₂介晶/还原氧化石墨烯纳米片（TGR）杂化物。这些具有伍尔夫形状的金红石型TiO₂介晶由具有相同取向方向的超微小棒状亚基组成，并被还原氧化石墨烯（RGO）纳米片紧密包裹。研究发现，ADBS在自组装过程中对介晶的形成起关键作用，它支撑着氧化石墨烯（GO）纳米片并参与介晶亚基的聚集。此外，TGR杂化物用作阳极材料，在1000次循环后，在20 C时表现出超过150 mA h g⁻¹的大容量，以及高达40 C的高倍率性能。这些高性能特性可能归因于由超微小亚基构建并与超导RGO纳米片杂化的金红石型TiO₂介晶的固有特性。
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