One step synthesis of samarium vanadate nanorods for high performance supercapacitors

ABSTRACT

Tetragonal SmVO₄ nanorods were prepared by simple solvothermal route with various temperatures. An optimised SmVO₄ sample was characterised through X-ray diffraction spectrum (XRD) and Micro-Raman spectroscopy. These results confirm that high crystallinity and pure tetragonal phase of SmVO₄ can be achieved. For morphology analysis, scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), energy dispersive X-ray analysis (EDX) and selected area electron diffraction (SAED) techniques were performed. These results confirmed the rod shape SmVO₄ nanoparticles with no impurities. For optical properties, UV-visible spectroscopy and photoluminescence (PL) techniques were performed. A broad absorption (290 nm – 330 nm) occurred in UV-Vis spectrum leads to multiple excitations and emissions at 542.7 nm, 600.5 nm and 643.7 nm with ⁴G_5/2→⁶H_5/2 (green), ⁴G_5/2→⁶H_7/2 (orange) and ⁴G_5/2→⁶H_9/2 (red), respectively. Finally, Vibrating sample magnetometer (VSM) study showed that the prepared SmVO₄ nanoparticles possessed paramagnetic nature with high retentivity of 366.06 emu. Electrochemical performance of SV1 electrode shows pseudocapacitance nature with high specific capacitance value of 310 F/g (1 A/g) from GCD.

KEYWORDS:

• Solvothermal
• photoluminescence
• paramagnetic and pseudocapacitance

Disclosure statement

No potential conflict of interest was reported by the author(s).