Title: A counter electrode based on hollow spherical particles of polyaniline for a dye-sensitized solar cell
Authors: Huang, Kuan-Chieh
Hu, Chih-Wei
Tseng, Chen-Ya
Liu, Chen-Yu
Yeh, Min-Hsin
Wei, Hung-Yu
Wang, Chun-Chieh
Vittal, R.
Chu, Chih-Wei
Ho, Kuo-Chuan
Department of Photonics
Issue Date: 2012
Abstract: Hollow spherical polyaniline (hsPANI) particles are synthesized and deposited on an ITO/glass substrate to prepare a counter electrode (designated as hsPANI-CE) for a dye-sensitized solar cell (DSSC). The structure and crystallization of the hsPANI particles are characterized by using high resolution transmission electron microscopy (HR-TEM), field-emission scanning electron microscopy (FE-SEM), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectra. A power-conversion efficiency (h) of 6.84% is obtained for the DSSC with the hsPANI-CE, while it is 6.02% in the case of the DSSC with a CE based on pristine PANI (designated as PANI-CE). Such enhancement is attributed to the hsPANI film having a larger active surface area (A) of 0.191 cm(2), compared to that of the PANI film (A = 0.126 cm(2)), both values being estimated by a rotating disk electrode (RDE). Cyclic voltammetric (CV) curves have evidenced that the electro-catalytic ability of the hsPANI-CE for the reduction of tri-iodide (I-3(-)) ions is higher than that of the PANI-CE. As a reference, the DSSC with a Pt-sputtered CE gives an h of 7.17%. Electrochemical impedance spectroscopic (EIS) spectra are used to substantiate the photovoltaic behaviors. The results suggest that the film consisting of hsPANI particles can be a potential catalytic layer for the replacement of Pt in the CE of a DSSC.
URI: http://hdl.handle.net/11536/16562
ISSN: 0959-9428
Volume: 22
Issue: 29
End Page: 14727
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