Soft-Template Simple Synthesis of Ordered Mesoporous Titanium Nitride-Carbon Nanocomposite for High Performance Dye-Sensitized Solar Cell Counter Electrodes
Soft-Template Simple Synthesis of Ordered Mesoporous Titanium Nitride-Carbon Nanocomposite for High Performance Dye-Sensitized Solar Cell Counter Electrodes
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DOI：
10.1021/cm203672g
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发表时间：
2012-05-08
影响因子：
8.6
通讯作者：
Lee, Jinwoo
中科院分区：
文献类型：
--
作者：
Ramasamy, Easwaramoorthi;Jo, Changshin;Lee, Jinwoo
有序介孔氮化钛-碳（表示为OM TiN-C）纳米复合材料具有高表面积（389 m（2）g（-1））和均匀的六方介孔（约. 5.5 nm）通过软模板法容易地合成。作为结构导向剂，Pluronic F127三嵌段共聚物与无机前体、甲阶酚醛树脂聚合物和预水解的TiCl 4形成有序结构，然后在氮气和氨流下在700 ℃下连续加热。在这项研究中，母体OM TiO 2-C中的无定形碳充当刚性支撑，防止TiO 2纳米晶体向TiN纳米晶体转化过程中的结构崩溃。然后，OM TiN-C被成功地应用于染料敏化太阳能电池（DSC）的对电极材料。采用有机电解质二硫化物/硫醇盐（T-2/T-）对OM TiN-C纳米复合材料的电催化性能进行了研究。由于TiN纳米晶和无定形碳缺陷的存在，在有机电解质体系（T-2/T-）中，使用OM TiN-C作为对电极的DSC显示出6.71%的能量转换效率（铂对电极DSC：3.32%）。此外，基于OM TiN-C对电极的DSC显示出8.41%的能量转换效率，而使用铂作为对电极的DSC在碘化物电解质体系中显示出仅8.0%的转换效率。OM TiN-C对电极的上级性能是由于OM TiN-C纳米复合材料具有较低的电荷转移电阻、较高的电导率和丰富的活性中心。与铂对电极相比，OM TiN-C对电极在有机电解液中具有更好的化学稳定性。
Ordered mesoporous titanium nitride-carbon (denoted as OM TiN-C) nanocomposite with high surface area (389 m(2) g(-1)) and uniform hexagonal mesopores (ca. 5.5 nm) was facilely synthesized via the soft-template method. As a structure-directing agent, Pluronic F127 triblock copolymer formed an ordered structure with inorganic precursors, resol polymer, and prehydrolyzed TiCl4, followed by a successive heating at 700 degrees C under nitrogen and ammonia flow. In this study, the amorphous carbon within the parent OM TiO2-C acted as a rigid support, preventing structural collapse during the conversion process of TiO2 nanocrystals to TiN nanocrystals. The OM TiN-C was then successfully applied as counter electrode material in dye-sensitized solar cells (DSCs). The organic electrolyte disulfide/thiolate (T-2/T-) was introduced to study the electrocatalytic property of the OM TiN-C nanocomposite. Because of the existence of TiN nanocrystals and the defect sites of the amorphous carbon, the DSCs using OM TiN-C as a counter electrode showed 6.71% energy conversion efficiency (platinum counter electrode DSCs: 3.32%) in the organic electrolyte system (T-2/T-). Furthermore, the OM TiN-C counter electrode based DSCs showed an energy conversion efficiency of 8.41%, whereas the DSCs using platinum as a counter electrode showed a conversion efficiency of only 8.0% in an iodide electrolyte system. The superior performance of OM TiN-C counter electrode resulted from the low charge transfer resistance, enhanced electrical conductivity, and abundance of active sites of the OM TIN-C nanocomposite. Moreover, OM TiN-C counter electrode showed better chemical stability in organic electrolyte compared with the platinum counter electrode.