Publication date: 1st April 2013
Carbon black-LaCoO3 was prepared as counter electrode for dye-sensitized solar cell, the energy conversion efficiency of the cell using carbon black-LaCoO3 counter electrode was comparable to that obtained from Pt electrode. Cyclic voltammogram (CV) of carbon black-LaCoO3 electrode showed more reversible redox reaction of I-/I2 and increased anodic and cathodic currents of the redox couple on comparing with that of carbon black electrode, as a result, the peak potentials were closed to those obtained from Pt electrode. Electrochemical impedance spectra (EIS) indicated a decrease in charge transfer resistance of carbon black-LaCoO3 electrode compared to that of Pt electrode. X-ray diffraction (XRD) of the carbon black-LaCoO3 composite calcined at 400 °C showed mixture of the remained LaCoO3 perovskite structure and CoO. The carbon black-LaCoO3 composite was further characterized by Co K-edge X-ray absorption near edge structure (XANES) spectroscopy. The results revealed mixed phases of Co2+ and Co3+ which were observed in the calcined (400 °C) carbon black-LaCoO3 composite and were consistent with the XRD result.
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