The surface treatment of Ti meshes for use in large-area flexible dye-sensitized solar cells

► The surface treatment of the Ti mesh increases the void space of the Pt/Ti counter electrode. ► The HF post-treatment of the Ti mesh decreases the resistance of the Pt/Ti counter electrode. ► The Pt/Ti counter electrode shows high electrocatalytic activity and low resistance. ► The photoelectric efficiency of the large-area (80 cm2) flexible DSSC reaches 6.17%.