WCNRs are synthesized by hydrothermal method.
WCNRs-ZrO2, WCNRs-TiO2 and WCNRs-ZrO2-TiO2 were prepared and used as counter electrodes.
Mixture of WCNRs-ZrO2 shows excellent electrochemical activity.
WCNRs-ZrO2 counter electrode based DSSC produces enhanced power conversion efficiency.