WO3/V2O5 Nanorod Materials as Electrochemical Supercapacitor

Tungsten trioxide (WO3) is an N-type semiconductor material that has been widely studied for use in sensors, electrochromism, photocatalysts, and energy storage devices. A simple and low-cost microwave-assisted method have been adopted to prepare the composite.

Recently, tungsten trioxide/vanadium oxide (WO3/V2O5) nanorod materials as electrochemical supercapacitor have been prepared by microwave assisted method, which show the maximum capacitance of 386F/g, capacitance retention of 104%, and columbic efficiency of 99%. Preparation of WO3/V2O5 nanorod materials is as below:

First, a 0.1 M NH4VO3 solution and a 0.1 M NH4WO4 solution were prepared, and the HNO3 solution was added dropwise under constant stirring to adjust the pH to ~2. After a period, 2 wt%, 4 wt%, and 6 wt% NH4WO4 solutions and 0.1 M NH4VO3 precursor solution were slowly added to prepare WO3/V2O5 nanocomposites. The well mixed solution was stirred for one hour and subjected to microwave irradiation for 10 minutes. After that, the microwave-irradiated solution was allowed to stand to form a clear precipitate. The collected precipitate was washed several times with ethanol to dissolve the residue and dried on a hot plate. The dried powder is heated in a muffle furnace at 200 °C for 4 hours. The final products are labeled (a) pure V2O5 and (b) 2 wt%, (c) 4 wt% and (d) 6 wt% WO3 loaded V2O5 samples.

In conclusion, WO3/V2O5 nanorod materials as electrochemical supercapacitor were successfully prepared by a simple and low-cost microwave-assisted method. Surface and morphological image analysis showed rod-like morphology. The surface area (22.798 m2/g), pore volume (0.137 cc/g) and particle size (18 nm) were analyzed by BET analysis. The pure V2O5 nanostructures showed a maximum specific capacitance of 150F/g in 1M H2SO4 electrolyte, and the V2O5 nanocomposites with different weight percentages of WO3 were enhanced to 260, 265 and 386F/g, respectively. Long-cycle testing shows that after 5,000 cycles, the capacitance retention rate is 104%, and the coulombic efficiency is 99%.

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