基于MWCNT/TiO_2对电极和硫醇盐/二硫化物非碘氧化还原电对的染料敏化太阳能电池性能  

Dye-Sensitized Solar Cells Based on MWCNT/TiO_2 Counter Electrode and Thiolate/Disulfide Non-Iodine Redox Couple

作　　者：王育乔[1,2] 王盼盼[1] 卢静[1] 白一超 顾云良[1] 孙岳明[1,2] 

机构地区：[1]东南大学化学化工学院,南京211189 [2]江苏省光电功能材料工程实验室,南京211189

出　　处：《物理化学学报》2015年第3期448-456,共9页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划(973)(2013CB932902);国家自然科学基金(21173042);江苏省自然科学基金(BK20141338);江苏省科技支撑计划(BE2013118);中央高校基本科研业务费专项资金(2242014k10025)资助项目~~

摘　　要：采用水热法合成出多壁纳米碳管/二氧化钛(MWCNT/Ti O2)复合物,并作为染料敏化太阳能电池(DSSC)中对电极材料并组装成电池.通过场发射扫描电子显微镜(FE-SEM)、傅里叶变换红外(FTIR)光谱、X射线粉末衍射(XRD)、同步热重-差示扫描量热(TGA-DSC)、拉曼(Raman)光谱和光电子能谱(XPS)等方法对其形貌、组成和结构进行表征.结果表明,酸化MWCNT表面―COOH与水热生长出的锐钛矿Ti O2表面―OH之间,通过形成类似于O=C―O―Ti或者C―O―Ti的结构,能有效地增强复合物薄膜层与导电玻璃基底之间的相互作用.通过循环伏安(CV)、电化学阻抗谱(EIS)、塔菲尔曲线(Tafel)和电池的伏安特性曲线等方法研究了该类对电极对硫醇盐/二硫化物(T-/T2)非碘氧化还原电对的光电化学特性.结果表明:当MWCNT与Ti O2质量比为3:1时,基于该复合物对电极与T-/T2非碘氧化还原电对所组装DSSC的开路电压为0.63 V,短路电流为15.81 m A·cm-2,填充因子为0.65,光电转换效率达到6.47%.Multi-walled carbon nanotube（MWCNT）/Ti O2 composites were prepared using acid-treated MWCNT and titanium（IV） isopropoxide by a facile hydrothermal method. The morphology and structure of composites were characterized by field- emission scanning electron microscopy（FE- SEM）, Fourier transform infrared spectroscopy（FTIR）, X-ray diffraction（XRD）, thermal gravimetric analysis with differential scanning calorimetry（TGA-DSC）, Raman and X-ray photoelectron spectroscopy（XPS）. The results show that the cohesion effect of MWCNT/Ti O2 was due to the interaction between ―COOH group of acid-treated MWCNT and ―OH group of the anatase Ti O2 surface, which might form a similar chemical bonding（O=C―O―Ti or C―O―Ti） interaction.The photoelectrochemical performance of dye-sensitized solar cell（DSSC） based on both MWCNT/Ti O2 counter electrode and thiolate/disulfide（T-/T2） non-iodine redox couple was investigated using cyclic voltammetry（CV）,electrochemical impedance spectroscopy（EIS）, Tafel and voltage-photocurrent density curves. The results indicate that the reduction of T2 to T-at MWCNT/Ti O2 counter electrode was more effective than that of Pt counter electrode. Under optimized conditions（m（MWCNT）/m（Ti O2）, mass ratio）, DSSC achieved an optimal performance, such as open-circuit voltage of 0.63 V, short-circuit photocurrent density of 15.81 m A·cm^-2, fill factor of 0.65, and photon-to-electron conversion efficiency of 6.47%.

关 键 词：对电极 非碘氧化还原电对 电催化活性 光电性能 太阳能电池 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O611.3[理学—无机化学]