Graphene oxide nanosheets as an effective template for the synthesis of porous TiO2 film in dye-sensitized solar cells
Graphene oxide nanosheets as an effective template for the synthesis of porous TiO2 film in dye-sensitized solar cells
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氧化石墨烯纳米片作为染料敏化太阳能电池中多孔二氧化钛薄膜合成的有效模板
DOI：
10.1016/j.apsusc.2015.06.102
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发表时间：
2015-12-15
影响因子：
6.7
通讯作者：
Zhao, Li
中科院分区：
文献类型：
--
作者：
Wang, Ping;He, Fenglong;Zhao, Li
模板法是以各种有机组分为造孔剂制备各种多孔无机材料的有效方法。在空气中高温煅烧后，有机组分可以原位分解成气态CO2，从而在无机材料中形成多孔结构。除了已知的有机组分外，还迫切需要开发新的、简单的含碳模板来制备多孔无机纳米结构。本研究以氧化石墨烯（GO）纳米片为模板制备了多孔TiO 2薄膜光电极，并将其应用于染料敏化太阳能电池（DSSC）。采用三步法制备了多孔TiO 2薄膜，即首先在TiO 2表面均匀接枝GO纳米片（TiO 2-GO），然后采用刮刀法制备TiO 2-GO薄膜，最后通过高温煅烧原位去除GO形成多孔结构。研究了GO含量对DSSC光电转换性能的影响。结果表明，多孔TiO 2-GO膜的DSSC的光电转换效率（0.75%）达到最大值（4.65%），远高于无孔TiO 2膜的DSSC的光电转换效率（4.01%）。提高的转化效率可以归因于高温煅烧后由GO纳米片引起的更多多孔结构的形成。这一工作为其他多孔结构材料的制备提供了新的思路。（C）2015 Elsevier B. V.保留所有权利。
Template method by using various organic components as the pore-forming agent is an effective strategy for the preparation of various porous inorganic materials. After high-temperature calcination in air, the organic components can be in situ decomposed into the gaseous CO2, resulting in the formation of porous structures in inorganic materials. In addition to the well-known organic components, it is highly required to develop new and simple carbon-containing template to prepare porous inorganic nanostructures. In this study, graphene oxide (GO) nanosheets were used as a new template for the preparation of porous TiO2 film photoelectrode, which can be applied in dye-sensitized solar cells (DSSCs). The porous TiO2 film was fabricated via a three-step method, including the initially homogeneous grafting of GO nanosheets on the TiO2 surface (TiO2-GO), the preparation of TiO2-GO film using blade method and final formation of porous structure after the in situ removal of GO by high-temperature calcination. The effect of GO content on photoelectric conversion performance of the as-fabricated DSSCs was investigated. It was found that the conversion efficiency of DSSC based on porous TiO2-GO (0.75%) film reached up to a maximum value (4.65%), which was much higher than that of DSSC based on nonporous TiO2 film (4.01%). The enhanced conversion efficiency can be attributed to the formation of more porous structures caused by the GO nanosheets after high-temperature calcination. This work may provide a new insight for preparing other porous structured materials. (C)2015 Elsevier B.V. All rights reserved.