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Serge Zhuiykov

Serge Zhuiykov

Ghent University Global Campus, South Korea

Title: Supercapacitor with improved performance based on ALD-developed two-dimensional WO3/TiO2 heterojunction

Biography

Biography: Serge Zhuiykov

Abstract

Supercapacitors (SCs) also known as, electrochemical capacitors, have been considered as one of the potential energy storage systems in addition to batteries, due to their high power density, fast charging/discharging and long-term cycling stability. Many metal oxide including RuO2, MnO2, Co3O4, NiO, SnO2, TiO2, WO3, perovskites, ferrites, etc., have been applied as alternative materials for supercapacitor electrodes. Among these metal oxides, TiO2 and WO3 are two of the most versatile materials and have been widely applied in electronics, photocatalysts, sensors and electrochromism. In the past, we demonstrated high capabilities of monolayers of TiO2 and WO3 developed by atomic layer deposition (ALD). It is appeared to indicate that both of them are promising candidate materials for high-performance SC electrodes. Moreover, nanostructured WO3/TiO2 heterojunction was highly investigated in various applications, especially in photochemistry and photo-electrochemistry, and has already exhibited excellent electrochemical properties. However, atomically-thin two-dimensional (2D) WO3/TiO2 heterojunction have not yet been considered and investigated as the electrode material in SCs. Therefore, in this study, we demonstrate for the first time capabilities of the 2D WO3/TiO2 heterojunction developed by ALD technique for SC electrodes. CV curves of three 2D nanomaterials at scan rate of 50 mV s-1 are presented in figure below. The ALD-developed WO3/TiO2 heterojunction has a uniform thickness of ~12 nm with a relative rough surface. The SC electrode based on this heterojunction has shown excellent super-capacitive behavior with high specific capacitance up to 625.53 F g-1 at the current density of 1 A g-1 and remarkable long-term stability of 97.98 % over 2000 cycles.

Recent Publications:

1. Lockhande C D et al (2011) Metal oxide thin film based supercapacitors. Curr. Appl. Phys. 11:255-270.

2. Bavykin D V et al (2006) Protonated titanates and TiO2 nanostructured materials: Synthesis, properties, and applications Adv. Mater. 18:2807-2824.

3. Zheng H et al (2011) Nanostructured tungsten oxide - Properties, synthesis, and applications. Adv. Funct. Mater. 21:2175-2196.

4. Zhuiykov S et al (2017) Wafer-scale fabrication of conformal atomic-layered TiO2 by atomic layer deposition using tetrakis (dimethylamino) titanium and H2O precursors. Mater. Des. 120:99-108.

5. Zhuiykov S et al (2017) Atomic layer deposition-enabled single layer of tungsten trioxide across a large area. Appl. Mater. Today 6:44-53.