Synthesis of efficient Ni0.9X0.1Se2 (X= Cd, Co, Sn and Zn) based ternary selenides for dye-sensitized solar cells

被引：10
作者：
Theerthagiri, J. [1 ]
Senthil, R.A. [1 ]
Susmitha, K. [2 ]
Raghavender, M. [2 ]
Madhavan, J. [1 ]
机构：
[1] Solar Energy Lab, Department of Chemistry, Thiruvalluvar University, Vellore, 632 115, Tamilnadu
[2] Department of Physics, Yogi Vemana University, Kadapa, 516 003, Andhra Pradesh
来源：
Materials Science Forum | 2015年 / 832卷
关键词：
Counter electrode; Dye-sensitized solar cells; Electrocatalytic activity; Metal selenides; Power conversion efficiency;
D O I：
10.4028/www.scientific.net/MSF.832.61
中图分类号：
学科分类号：
摘要：
A low-cost platinum (Pt) free electrocatalyst of NiSe2 and Ni0.9X0.1Se2 (X=Cd, Co, Sn and Zn) have been developed by hydrothermal reduction route and utilized as counter electrode (CE) in dye-sensitized solar cells (DSSCs). The purity, phase formation and morphology of the sample were characterized by X-ray diffraction, field-emission scanning electron microscopy and energy dispersive spectroscopy. The electrocatalytic activity of the synthesized selenides for the reduction of I3- to I- was evaluated using cyclic voltammetry and electrochemical impedance spectroscopy. The Ni0.9Zn0.1Se2 CE exhibited lower internal resistance and higher electrocatalytic activity than the other ternary metal selenides and this may be due to an increase in the electrocatalytic active sites on the surface of Ni0.9Zn0.1Se2. As a result, the DSSC fabricated with Ni0.9Sn0.1Se2 CE achieved a high power conversion efficiency of 4.20% under an illumination of 100 mW/cm2, which is comparable to that of DSSC with Pt CE (6.11%). These results demonstrate the potential application of Ni0.9Zn0.1Se2 as an alternative CE to replace expensive Pt in DSSCs. This study can be further extended for the development of new metal selenides based CE electrocatalysts with high activity for the DSSCs. © (2015) Trans Tech Publications, Switzerland.
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页码：61 / 71
页数：10
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