Browsing by Author "Sunanda Kakroo"

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Counter Electrode in Polymer-Electrolyte-Based DSSC: Platinum Versus Electrodeposited MnO2
(Wiley-VCH Verlag, 2019) Sunanda Kakroo; Karan Suran; Bhaskar Bhattachary
Manganese oxide have been successfully electrodeposited on fluorine-doped tin oxide glass electrodes via a facile, green, and energy-efficient electrodeposition technique, which is used as counter electrode in a dye-sensitized solar cell using polyethylene-oxide-based solid polymer electrolyte. X-ray diffraction, energy dispersive X-ray, and scanning electron microscopy are used to study the structure, elemental composition, and surface morphology of the electrodeposited electrode. The electrochemical performance of the electrode is studied by cyclic voltammetry and electrochemical impedance spectroscopy. Performance of the cells is investigated by photocurrent–voltage characteristics using an input power (Pin) of 100 mW cm−2. The short-circuit current density (Jsc) is 0.22 mA cm−2, open-circuit voltage (Voc) is 0.76 V, fill factor (FF) is 0.5, and power conversion efficiency (η) is 0.08%. Further, a comparison with the conventional platinum (Pt) counter electrode is made and presented in this paper. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Electrodeposited MnO2-NiO Composites as a Pt Free Counter Electrode for Dye-Sensitized Solar Cells
(Springer, 2020) Sunanda Kakroo; Karan Surana; Bhaskar Bhattacharya
Manganese oxide-Nickel oxide (MnO2-NiO) hasbeen successfully deposited on Fluorine doped Tin Oxide (FTO) glass electrode using a facile, effective and low costelectrodeposition process and was used as counter electrode (CE) in dye-sensitized solar cells(DSSC).The cells were characterized using electrochemical impedance spectra and cyclic voltammetry, which revealed enhanced electrocatalytic ability for the reduction of triiodide/iodide (I3 − to I−). Further, the photocurrent–voltage (J–V) characteristics under the illumination of 100 mW/cm2 were studied. The DSSC with MnO2-NiO CE revealed higher short-circuit current density (Jsc) of 0.3 mA/cm2, open-circuit voltage (Voc) of 0.83 V, and fill factor of 0.84. This suggests that the electrodeposited MnO2-NiO coated FTOelectrode can be used to replace the commonly employed and expensive metal platinum (Pt) in DSSC. © 2020, The Minerals, Metals & Materials Society.