Synthesis characterization and electrochemical performance of chromium doped tin oxide

David Bahati, Mukka Prasanna, Pulapa Venkata Kanaka Rao

Abstract


Chromium doped Tin oxide nanoparticles with chromium concentrations ranging from 1 to 5 wt% were synthesized by microwave irradiation technique. Standard characterization techniques were used to understand the characteristics of the nanoparticles obtained. X-Ray Diffraction (XRD) pattern depicted the tetragonal crystal structure for Cr doped SnO2 nanoparticles. From the results of crystallite sizes for various doping concentrations, it was observed that doping inhibits the growth of crystalline grains of SnO2. Scanning Electron Microscope (SEM) images confirmed the surface morphology modifications due to varying doping concentration of Cr, nanocrystallite showed extra agglomerated status with mesoporous structures. Energy dispersive spectrometer (EDAX) observations confirmed the doping of chromium ions in SnO2 lattice.  Other standard characterization techniques such as FESEM, TEM, HRTEM, FTIR, UV-Vis spectroscopic analysis were also carried out for the samples prepared. The electrochemical behavior of the sample was determined using Cyclic Voltammetry (CV) by scanning the potential at a rate of 50 mV s‾¹ and for a maximum current of 600 mA carried out on undoped SnO2 and Cr doped SnO2. It was observed that as the wt% of Cr in Cr doped SnO2 increases, the electrochemical performance increases as compared to undoped SnO2. A fairly larger peak current of 15 μA and a larger oxidation peak potential of 0.76 V were observed for 5 wt% Cr doped SnO2.

Keywords


Tin Oxide (SnO2); Chromium(Cr); Microwave irradiation; XRD; FESEM; HRTEM; FTIR; UV-Vis spectroscopy; Cyclic voltammetry (CV)

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DOI: https://doi.org/10.23954/osj.v5i3.2444

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