Journal
RESULTS IN PHYSICS
Volume 12, Issue -, Pages 2012-2020Publisher
ELSEVIER
DOI: 10.1016/j.rinp.2019.02.012
Keywords
Supercapacitor; Tungsten oxide; Crystal phases; Surface controlled capacitance; Charge storage; Pseudocapacitive
Funding
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Education [2018048610]
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korean Government Ministry of Trade, Industry and Energy [20164030201310]
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Tungsten oxide is a versatile material with different applications. It has many polymorphs with varying performance in energy storage application. We report simple and facile way to synthesize four phases of tungsten oxide from same precursor materials only by changing the pH and temperature values. Monoclinic, hexagonal, orthorhombic and tetragonal phase obtained, were analyzed and tested for supercapacitor application. The electrochemical analysis of four phases indicates that the hexagonal phase is best-suited electrode material for supercapacitor. The hexagonal phase exhibits higher specific capacitance (377.5 Fg(-1) at 2 mV s(-1)), higher surface capacitive contribution (75%), better stability and rate capability of all four phases.
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