Evaluation of performance characteristics of nano TiO₂and TiO₂-ZnO composite for DSSC applications and electrochemical determination of potassium ferrocyanide using cyclic voltammetry

Abstract

Nanoparticles of TiO2 and TiO2-ZnO composite (2:1 molar ratio) were synthesized utilizing the sol-gel and solution combustion approaches, respectively. Scanning electron microscopic, energy dispersive x-ray, x-ray diffraction, UV-visible spectroscopy, and Brunauer–Emmett–Teller analysis were employed to characterize the synthesized nanoporous TiO2 and the composite of TiO2-ZnO nanoparticles. Fabrication of dye-sensitized solar cells (DSSCs) was carried out by incorporating the synthesized nanoporous materials coating on the photoanodes using the doctor blade technique. Nano TiO2 and the composite of TiO2-ZnO were also analyzed using cyclic voltammetry test, and their performance was compared for the electrochemical detection of potassium ferrocyanide. The composite of TiO2-ZnO exhibited better electrocatalytic activity in comparison with the pure TiO2 nanoparticles. The fabricated DSSCs by employing nano TiO2 particles and TiO2-ZnO composite as the semiconductor photoanode materials were compared for photovoltaic performance. The DSSC fabricated with TiO2 nanoparticles exhibited better photovoltaic performance with an efficiency of 2.22% and a current density of 4.152 mA cm−2 than that fabricated with TiO2-ZnO composite with an efficiency of 0.0022% and a short circuit current density of 0.014 mA cm−2.

Tb- and Eu-doped yttrium oxyselenides as novel absorber layers for superstrate thin-film photovoltaics: improved spectral optical absorption and green–red phosphor activation

“…The ideal reversibility of the K 3 Fe(CN) 6 system was confirmed for the modified electrodes as the ratio of i pa to i pc obtained for the modified electrodes were approximately unity. 71,74…”

“…The ideal reversibility of the K 3 Fe(CN) 6 system was confirmed for the modified electrodes as the ratio of i pa to i pc obtained for the modified electrodes were approximately unity. 71,74 Randles-Sevcik plots of i pa and i pc vs. square root of multiscans (10 mV s −1 to 100 mV s −1 ) are presented in Fig. 13g, h and i for the SPCEs' modified with the YOSe, YOSe:Tb and YOSe:Eu, respectively.…”