Synthesis of vertical WO3nanoarrays with different morphologies using the same protocol for enhanced photocatalytic and photoelectrocatalytic performances

Abstract

Tungsten trioxide (WO3) nanoarrays with different morphologies were successfully synthesized by a hydrothermal method on an FTO substrate. Various nanostructures of WO3including nanoflakes, nanoplates, nanoflowers and nanorods were obtained by adjusting only the acidity of the precursor solution. XRD patterns confirmed that the as-prepared orthorhombic WO3·0.33H2O transformed to the monoclinic WO3phase under annealing at 500 °C. UV-Vis absorbance spectroscopy indicated that the absorption edge of WO3nanoflowers exhibited a slight red-shift compared to other morphologies of WO3. The obtained WO3nanoflower arrays exhibit the highest photocurrent density and photocatalytic degradation activity towards methylene blue. Finally, the mechanism of the photocatalytic degradation of methylene blue by WO3is discussed.