Controllable synthesis of h-WO3 nanoflakes by L-lysine assisted hydrothermal route and electrochemical characterization of nanoflakemodified glassy carbon electrode
Journal Title: Materials Physics and Chemistry - Year 2019, Vol 1, Issue 1
Abstract
Hexagonal tungsten trioxide (h-WO3) nanoflakes have been synthesized by a hydrothermal approach using L-lysine as the shape directing agent. The influence of hydrothermal reaction time and L-lysine content on the morphology of h-WO3 was investigated. The experimental results showed that the nanoflake morphology could be achieved at higher concentration of L-lysine. Based on the evolution of nanoflake morphology as a function of hydro-thermal duration, a “dissolutioncrystallization-Ostwald ripening” growth mechanism has been proposed. The electro-chemical performance of h-WO3 nanoflakes has also been investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It is found that h-WO3 modified glassy carbon electrode (GCE) showed lower charge transfer resistance and enhancement in peak current attributed to the enrichment in electroactive surface area and faster electron transfer kinetics at h-WO3 modified GCE.
Authors and Affiliations
Vijaya Kumar Gangaiah, Ashoka Siddaramanna, Prashanth Shivappa Adarakatti, Gujjarahalli Thimanna Chandrappa
Keywords
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