Rapid Anodic Formation of High Aspect Ratio WO₃ Layers with Self‐Ordered Nanochannel Geometry and Use in Photocatalysis

Channel hopping: the formation of WO(3) layers with an aligned nanochannel morphology by using self-organizing anodization of a tungsten metal substrate is demonstrated. The nanochannel layers with diameters of approximately 9 nm can be grown to about 10 μm thickness. Layers optimized for length and structure are promising for visible-light photocatalytic applications, such as water-splitting photoanodes.