Hybrid Material of PANI with TiO2-SnO2: Pseudocapacitor Electrode for Higher Performance Supercapacitors

摘要

Mixed metal oxide composites of TiO2-SnO2 were prepared by varying the quantities of SnCl_22H2O by the impregnation method to TiO2. Aniline monomer was polymerized in the suspension of TiO2-SnO2 to form organic-inorganic composite materials, in which metal oxide particles were embedded within polyaniline (PANI-SA). Formation of the composite was confirmed from FT-IR, XRD and EDAX analyses and morphological image was found from FE-SEM. The electrochemical properties were investigated using CV, CD and EIS analyses. PANI-SATiO2-SnO2 showed higher electrochemical performances than that of PANI-SA TiO2 or PANI-SA SnO2, which areattributed from (i) higher electron transfer rate due to reduction in band gap and (ii) more space between the nano rods, which allow the electrolyte to interact more surface of the electrode. The best PANI-SA TiO2-SnO2 material exhibited a specific capacitance of 540 F g~(-1) with an energy density of 27 Wh kg~(-1)at a power density of 200 W kg~(-1). Retention in capacitance of 85% was obtained even at 6000 cycles and this organic-inorganic composite fulfilled the requirement of long durability necessary for an energy storage system.