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Research Papers

Cobalt Sulphate as an Alternative Counter Electrode Material in Dye Sensitized Solar Cells

[+] Author and Article Information
R. S. Shelke

Department of Mechanical Engineering,
G.H. Raisoni College of Engineering,
Hingna Road,
Nagpur Maharashtra 440016, India
e-mail: shelkerupesh@yahoo.com

S. B. Thombre

Department of Mechanical Engineering,
Visvesvaraya National Institute of Technology,
Nagpur Maharashtra 440016, India

S. R. Patrikar

Department of Physics,
Visvesvaraya National Institute of Technology,
Nagpur Maharashtra 440016, India

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received October 20, 2013; final manuscript received April 19, 2014; published online May 15, 2014. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 136(4), 041006 (May 15, 2014) (6 pages) Paper No: SOL-13-1315; doi: 10.1115/1.4027574 History: Received October 20, 2013; Revised April 19, 2014

Dye sensitized solar cells (DSSCs) have become an attractive and cheap device for the conversion of solar light into electrical energy. The glass substrate coated with platinum is widely used as a counter electrode because of its high catalytic activity for iodide/triiodide redox reaction. This paper presents a systematic comparative study on exploring and understanding the performance of DSSC using cobalt sulphate as a counter electrode material in place of platinum or graphite. However, platinum being costly, other materials like graphite or carbon black etc. also used in DSSCs but with reduced conversion efficiency. Later in the present study, it was found that, the DSSCs made with graphite as a counter electrode does not have long term stability. It may be mentioned here that cobalt sulphate so far has never been used as a counter electrode in DSSC fabrication. It is found that DSSCs made with the cobalt sulphate as a counter electrode gives better photovoltaic performance over that with the graphite-coated counter electrode and can be a suitable alternative for DSSCs in future. The paper also presents a comparative study on the performance degradation of DSSCs using cobalt sulphate and graphite as a counter electrodes. The investigation was carried out initially for 60 days in succession and then after 1 yr without charging with dye or electrolyte. Good long term stability of the cobalt sulphate compared to graphite was observed during this study.

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Figures

Grahic Jump Location
Fig. 1

(a) I-V curve for DSSCs (counter electrode: cobalt sulphate/graphite), (b) power curve for DSSCs (counter electrode: cobalt sulphate/graphite)

Grahic Jump Location
Fig. 3

(a) Degradation of Voc for DSSCs (counter electrode: cobalt sulphate/graphite) and (b) degradation of Jsc for DSSCs (counter electrode: cobalt sulphate/graphite)

Grahic Jump Location
Fig. 4

(a) Degradation of P for DSSCs (counter electrode: cobalt sulphate/graphite) and (b) degradation of FF for DSSCs (counter electrode: cobalt sulphate/graphite)

Grahic Jump Location
Fig. 5

(a) Comparative degradation of Voc for two counter electrodes, (b) comparative degradation of Jsc for two counter electrodes, and (c) comparative degradation of P for two counter electrodes

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