Synthesis and photocatalytic application of oriented hierarchical ZnO flower-rod architectures

► ZnO flower-rod arrays based on ITO was firstly used as a photocatalytic device. ► This photocatalytic device is convenient to recycle without centrifugation. ► Electrochemical method was used to research the photodegradation mechanism. ► The degradation efficiency of Rhodamine B is enhanced by ZnO flower-rod arrays. ► This structure could be found in applications in solar cells, sensors and other devices.