Quantum mechanics

Orthorhombic crystal system

Phase (matter)

Engineering

Oxide

Capacitance

Electrochemistry

Metallurgy

Materials science

Crystal structure

Power (physics)

Chemical engineering

Hexagonal crystal system

Physical chemistry

Supercapacitor

Thermodynamics

Physics

Nanotechnology

Organic chemistry

Monoclinic crystal system

Energy storage

Tetragonal crystal system

Charge (physics)

Crystallography

Chemistry

Electrode

Hexagonal phase

Optoelectronics

Engineering physics

Results in Physics

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.

Charge storage in WO3 polymorphs and their application as supercapacitor electrode material