Figure 4From: Unique and facile solvothermal synthesis of mesoporous WO3 using a solid precursor and a surfactant template as a photoanode for visible-light-driven water oxidationScanning electron microscopic (SEM) images. Top view of WO3-DDA samples calcined at (a) 400°C and (b) 500°C. (c) Cross-sectional view of the ITO/WO3-DDA electrode after being calcined at 500°C.Back to article page