title: Hydrothermal synthesis and electrochemical performances of 1.7 V NiMoO₄⋅xH₂O||FeMoO₄ aqueous hybrid supercapacitor.
abstract: One-dimensional (1D) NiMoO4⋅xH2O nanorods and β-FeMoO4 microrods are successfully synthesized by simple hydrothermal method without using any organic solvents. X-ray diffraction (XRD) patterns reveal the single phase formation of nickel molybdate (NiMoO4⋅xH2O) and pure monoclinic phase of β-FeMoO4. The growth of one dimensional morphology of both the molybdates are identified from scanning and transmission electron microscopes (SEM and TEM). The cyclic voltammogram envisage the pseudocapacitance behavior of NiMoO4⋅xH2O and β-FeMoO4 through the reversible redox reactions of Ni(3+)/Ni(2+) and Fe(3+)/Fe(2+) ions. An asymmetric supercapacitor is fabricated using NiMoO4⋅xH2O nanorods and β-FeMoO4 as a positive and negative electrode, respectively. The β-FeMoO4||NiMoO4⋅xH2O asymmetric supercapacitor delivers a capacitance of 81 F g(-1) at a current density of 1 mA cm(-2). The cell exhibits a high energy density of 29 W h kg(-1) and good cycling stability even after 1000 cycles.
authors.affiliation: Solid State Ionics and Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, India.
authors.forename: Baskar
authors.initials: B
authors.lastname: Senthilkumar
authors.affiliation: Solid State Ionics and Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, India. Electronic address: selvankram@buc.edu.in.
authors.forename: Ramakrishnan Kalai
authors.initials: RK
authors.lastname: Selvan
keywords: Asymmetric capacitor; Energy density; Iron molybdate; Nickel molybdate; Pseudocapacitance