Citation: SU Jia, LU Shan, WANG Sha-Sha, ZHANG Xue-Hua, FU Yu-Bin, HE Tao. Influence of pH Values on the Structure and Performance of a Polypyrrole Counter Electrode for Dye-Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2014, 30(8): 1487-1494. doi: 10.3866/PKU.WHXB201405272 shu

Influence of pH Values on the Structure and Performance of a Polypyrrole Counter Electrode for Dye-Sensitized Solar Cells

SU Jia ^1,2 ,
LU Shan ² ,
WANG Sha-Sha ² ,
ZHANG Xue-Hua ^2, ,
FU Yu-Bin ^1, ,
HE Tao ^2,

1.
1. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, Shandong Province, P. R. China;
2. National Center for Nanoscience and Technology, Beijing 100190, P. R. China

Received Date: 17 April 2014
Available Online: 27 May 2014
Fund Project:

The pH of the solution used to produce an electro- polymerized polypyrrole (PPy) film has a significant impact on the morphology and properties of the resulting film and, by extension, on the electrocatalytic activity of the film for the I^-/I₃^- redox reaction. Accordingly, the performance of dye-sensitized solar cells (DSSCs) based on PPy counter electrodes (CEs) is affected by solution pH. In this study, p-toluene sulfonate ion-doped PPy (PPy-TsO) CEs on fluorine-doped tin oxide (FTO) glass substrates were fabricated using an electrochemical method under a constant bias in solutions with various pH values. The effect of the pH of the synthetic solution on the morphology, structure, and electrocatalytic activity during the I^-/I₃^- redox reaction of the obtained PPy CEs was thoroughly investigated by scanning electron microscopy (SEM), UV-Vis absorption spectroscopy, X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). A pH value of 2.0 was found to represent the optimal value, since the PPy-TsO film produced at this pH exhibited the highest degree of doping, the longest conjugation length, and the highest catalytic activity. When working as the CE of a DSSC, this film also showed the highest power conversion efficiency. Films synthesized at pH values either above or below 2.0 exhibited inferior properties and lower performance when in DSSCs.
- Polypyrrole,
- Electrochemical polymerization,
- pH value,
- Electrocatalytic activity,
- Counter electrode,
- Dye-sensitized solar cell
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