Pt-free spray coated reduced graphene oxide counter electrodes for dye sensitized solar cells
| Autor: | Christopher T. G. Smith, S. R. P. Silva, Christopher A. Mills, Lingamallu Giribabu, K. Susmitha, Charanadhar Nagavolu, Kota Bhanu Sankara Rao, Vadali V. S. S. Srikanth, M. Raghavender |
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| Rok vydání: | 2016 |
| Předmět: |
Auxiliary electrode
Materials science Renewable Energy Sustainability and the Environment Graphene Oxide 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Dielectric spectroscopy Dye-sensitized solar cell chemistry.chemical_compound Chemical engineering chemistry law Electrode General Materials Science Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Solar Energy. 137:143-147 |
| ISSN: | 0038-092X |
| DOI: | 10.1016/j.solener.2016.08.002 |
| Popis: | Graphene oxide (GO) was synthesized using a modified Hummers method and was reduced by using focused sunlight to obtain solar reduced graphene oxide (SRGO). GO and SRGO are then used as Pt-free counter electrode materials in dye sensitized solar cells (DSSCs). GO and SRGO counter electrodes were prepared by a simple spray coating method to produce homogeneous electrode layers. The DSSCs with GO and SRGO counter electrodes exhibited an overall power conversion efficiencies of ∼3.4 and ∼4%, respectively. Cyclic voltammetry and electrochemical impedance spectroscopy reveal that the DSSC with SRGO counter electrode exhibits higher electro-catalytic activity and lower charge transfer resistance at the electrode/electrolyte interface (in comparison to the DSSC with GO) resulting in higher conversion efficiency. Moreover, the microstructural features of SRGO are found to be suitable for its improved interaction with the liquid electrolyte and the enhanced electro-catalytic activity at its surface. |
| Databáze: | OpenAIRE |
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