Enhanced Specific Capacitance and Cycling Stability of Li 2 Cu 2 (MoO 4 ) 3 of NASICON Family of Supercapacitor Applications

Enhanced Specific Capacitance and Cycling Stability of Li 2 Cu 2 (MoO 4 ) 3 of NASICON Family of Supercapacitor Applications Janet Dayanithi Department of Chemistry School of Basic Sciences Vels Institute of Science Technology and Advanced Studies Velan Nagar, P.V. Vaithiyalingam Road, Pallavaram Chennai Tamil Nadu 600117 India Magesh Murugesan Institute of Material Research Washington State University Pullman Washington 99163 USA Natarajan Annamalai Department of Biotechnology Dr. M.G.R. Chockalingam Arts College Arni Tamil Nadu 632317 India Ranjith Balu Department of Physics Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Thandalam Chennai Tamil Nadu 602105 India Kotteswaran Shanmugam Department of Chemistry School of Basic Sciences Vels Institute of Science Technology and Advanced Studies Velan Nagar, P.V. Vaithiyalingam Road, Pallavaram Chennai Tamil Nadu 600117 India https://orcid.org/0000-0002-8237-8167 Abstract

NASICON electrode materials exhibit a broad spectrum of electrochemical potentials, robust ionic conductivity, and structural and thermal stabilities. Using solid state reaction method, Li 2 Cu 2 (MoO 4 ) 3 was synthesized, a member of NASICON family of compounds based on molybdenum. Various analytical techniques employed to assess structural and morphological properties of synthesized nanomaterial. X‐ray diffraction (XRD) pattern indicated that generated Li 2 Cu 2 (MoO 4 ) 3 nanomaterial exhibited orthorhombic crystalline structure, with crystallite size of approximately 48 nm. The nanomaterial morphology was evaluated using field emission scanning electron microscopy (FESEM), showing columnar‐ or fiber‐like morphology composed of some conductivity points. The elemental composition of Li 2 Cu 2 (MoO 4 ) 3 was analyzed by EDAX analysis, confirming the presence of elements lithium, copper, molybdenum, and oxygen. The optical properties and band gap of Li 2 Cu 2 (MoO 4 ) 3 were analyzed by ultraviolet visible diffuse reflectance spectroscopy (UVDRS). Elemental composition of surface along with electronic states and oxidation states of component present in the nanomaterial Li 2 Cu 2 (MoO 4 ) 3 were investigated from X‐ray photoelectron spectroscopy (XPS). Electrochemical evaluation using cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopic (EIS) showed a specific capacitance of 250 F g −1 at 3.5 A g −1 with the high retention rate of 95.82% after 3000 cycles, indicating its potential for high performance supercapacitors.
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