大米状TiO_2/石墨烯水凝胶的制备及电化学应用
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- 英文论文题名：Preparation and Application of Rice-Shaped TiO_2/Graphene Hydrogel
- 论文作者：刘亚萍 ; 司淑贤 ; 高婷婷 ; 周国伟
- 英文论文作者：Yaping Liu ; Shuxian Si ; Tingting Gao ; Guowei Zhou ; Key Laboratory of Fine Chemicals in Universities of Shandong ; School of Chemistry and Pharmaceutical Engineering ; Qilu University of Technology
- 年：2016
- 作者机构：山东省高校轻工精细化学品重点实验室齐鲁工业大学化学与制药工程学院;
- 论文关键词：TiO2/石墨烯水凝胶 ; 团聚 ; 多孔结构 ; 电化学性能
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十九分会：电化学材料
- 语种：中文
- 分类号：TQ427.26
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十九分会 ; 电化学材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：189k
- 原文格式：D
- 会议级别：全国
摘要
近年来,TiO_2/石墨烯复合材料在能源领域已展现出了一定的优越性~([1])。但是,石墨烯片层间容易发生团聚导致其比表面和离子扩散速率降低,并且粉末结构的材料在充放电过程中会出现由体积膨胀收缩导致的结构破坏等问题,而三维多孔结构能够减少石墨烯片层间的团聚,提供更大的可利用表面积、更高的机械强度、更快的质子和电子传递速率以及更多的活性物质锚定位点,从而具有更加优越的性能,因此制备具有多孔结构的三维石墨烯基凝胶已成为研究领域的热点问题~([2])。本文利用溶剂热法成功制备了大米状TiO_2/石墨烯水凝胶(TGH)。SEM图(Fig.1)可以观察到长度为40-90 nm的大米状TiO_2粒子均匀的分散在石墨烯表面上。CV图(Fig.2a)和GCD图(Fig.2b)可以看出TGH具有一个良好的电容行为。
In recent years, TiO_2 / graphene composites have shown some advantages in the field of energy storage. However, the graphene sheets are prone to aggregate, which resulte in reduced surface area and ion diffusion rate, and the structure of the powder materials are easily destroyed by volume expansion and shrinkage during charge-discharge process. The three-dimensional porous structure can hinder the aggregation of graphene sheets and provide greater available surface area, higher mechanical strength, faster proton and electron transfer rate and more active sites, which lead to more superior performances. Thus, the three-dimensional graphene-based gels with porous structure have attracted great attention. The rice-shaped TiO_2 / graphene hydrogel was successfully prepared by a solvothermal method. SEM images show that rice-shaped TiO_2 nanoparticles exist homogeneously over the graphene sheets with typical lengths of 40-90 nm(Fig. 1). CV curves(Fig. 2a) and GCD curves(Fig. 2b) all show good capacitive behavior of TGH.
In recent years, TiO_2 / graphene composites have shown some advantages in the field of energy storage. However, the graphene sheets are prone to aggregate, which resulte in reduced surface area and ion diffusion rate, and the structure of the powder materials are easily destroyed by volume expansion and shrinkage during charge-discharge process. The three-dimensional porous structure can hinder the aggregation of graphene sheets and provide greater available surface area, higher mechanical strength, faster proton and electron transfer rate and more active sites, which lead to more superior performances. Thus, the three-dimensional graphene-based gels with porous structure have attracted great attention. The rice-shaped TiO_2 / graphene hydrogel was successfully prepared by a solvothermal method. SEM images show that rice-shaped TiO_2 nanoparticles exist homogeneously over the graphene sheets with typical lengths of 40-90 nm(Fig. 1). CV curves(Fig. 2a) and GCD curves(Fig. 2b) all show good capacitive behavior of TGH.
引文
[1]Zhang,Z.Y.;Xiao,F.;Guo,Y.L.;Wang,S.;Liu,Y.Q.Appl.Mater.Interfaces.2013,5(6):2227.
[2]Qiu,B.C.;Xing,M.Y.;Zhang,G.L.J.Am.Chem.Soc.2014,136,5852.
[2]Qiu,B.C.;Xing,M.Y.;Zhang,G.L.J.Am.Chem.Soc.2014,136,5852.
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