The cobalt oxide/hydroxide nanowall array film prepared by pulsed laser deposition for supercapacitors with superb-rate capability

► Crossed-beam pulsed laser deposition of aluminum doped cobalt oxide thin film. ► Preparation of cobalt oxide/hydroxide nanowall array film by etching the aluminum doped cobalt oxide thin film. ► Cobalt oxide/hydroxide nanowall array film has superior capacitive behaviors.