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

doi:10.3866/PKU.WHXB201412302

Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (3): 448-456.doi: 10.3866/PKU.WHXB201412302

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles Next Articles

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

WANG Yu-Qiao^1,2, WANG Pan-Pan¹, LU Jing¹, BAI Yi-Chao¹, GU Yun-Liang¹, SUN Yue-Ming^1,2

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).

Abstract

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

WANG Yu-Qiao, WANG Pan-Pan, LU Jing, BAI Yi-Chao, GU Yun-Liang, SUN Yue-Ming. Dye-Sensitized Solar Cells Based on MWCNT/TiO₂ Counter Electrode and Thiolate/Disulfide Non-Iodine Redox Couple[J].Acta Phys. -Chim. Sin., 2015, 31(3): 448-456.

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

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