Synthesis, Structural Characterization, and Electrochemical Performance of Layered ODA 2 SnCl 4 Two‐Dimensional Halide Perovskites as a Photo‐Assist
Nidhi Yadav, Navneet Kumar, Mrinmoy Kumar ChiniABSTRACT
Two‐dimensional (2D) layered halide perovskites are getting a lot of attention for use in electrochemical energy storage because of their layered structure, good charge movement, and ability to respond to light. In this study, a lead‐free material called octadecylammonium tin chloride (ODA 2 SnCl 4 ) was made using a method called inverse temperature crystallization (ITC) and tested as an electrode for a photo‐assisted supercapacitor. Tests using UV–vis spectroscopy, PXRD, and FE‐SEM showed that the material has a highly organized layered nanosheet shape with an optical band gap of 3.75 eV. Electrochemical tests showed mainly capacitive charge storage with b ‐values of 0.84 and 0.81. The low equivalent series resistance (4.8 Ω) and charge‐transfer resistance (18.6 Ω) showed that ions and electrons move through the material efficiently. The electrode had specific capacitances of 25.45 F/g from cyclic voltammetry and 41.25 F/g from galvanostatic charge–discharge, with an energy density of 44.44 Wh/kg and a power density of 80 W/kg. It kept 91.2% of its capacitance after 5000 cycles with over 98.5% coulombic efficiency. Also, when exposed to light, the electrochemical performance improved because of better charge separation.