物理化学学报 >> 2015, Vol. 31 >> Issue (3): 448-456.doi: 10.3866/PKU.WHXB201412302

电化学和新能源 上一篇    下一篇

基于MWCNT/TiO2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

王育乔1,2, 王盼盼1, 卢静1, 白一超1, 顾云良1, 孙岳明1,2   

  1. 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
  • 收稿日期:2014-11-13 修回日期:2014-12-29 发布日期:2015-03-06
  • 通讯作者: 王育乔, 孙岳明 E-mail:yqwang@seu.edu.cn;sun@seu.edu.cn
  • 基金资助:

    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)和中央高校基本科研业务费专项资金(2242014k10025)资助项目

Dye-Sensitized Solar Cells Based on MWCNT/TiO2 Counter Electrode and Thiolate/Disulfide Non-Iodine Redox Couple

WANG Yu-Qiao1,2, WANG Pan-Pan1, LU Jing1, BAI Yi-Chao1, GU Yun-Liang1, SUN Yue-Ming1,2   

  1. 1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China;
    2. Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, P. R. China
  • Received:2014-11-13 Revised:2014-12-29 Published:2015-03-06
  • Contact: WANG Yu-Qiao, SUN Yue-Ming E-mail:yqwang@seu.edu.cn;sun@seu.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2013CB932902), National Natural Science Foundation of China (21173042), Natural Science Foundation of Jiangsu Province, China (BK20141338), Science and Technology Support Project of Jiangsu Province, China, and Fundamental Research Funds for the Central Universities, China (2242014k10025).

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摘要：

采用水热法合成出多壁纳米碳管/二氧化钛(MWCNT/TiO2)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TiO2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TiO2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 mA·cm-2, 填充因子为0.65, 光电转换效率达到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

Abstract:

Multi-walled carbon nanotube (MWCNT)/TiO2 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/TiO2 was due to the interaction between ―COOH group of acid-treated MWCNT and ―OH group of the anatase TiO2 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/TiO2 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/TiO2 counter electrode was more effective than that of Pt counter electrode. Under optimized conditions (m(MWCNT)/m(TiO2), mass ratio), DSSC achieved an optimal performance, such as open-circuit voltage of 0.63 V, short-circuit photocurrent density of 15.81 mA·cm-2, fill factor of 0.65, and photon-to-electron conversion efficiency of 6.47%.

Key words: Counter electrode, Non-iodine redox couple, Electrocatalytic activity, Photoelectronic proverty, Solar cell