Fig. 1. Schematic diagram of structure and electrodeposition process of fiber ZnO-based photoelectrode. (a) Structural schematic diagram; (b) schematic diagram of the device for continuously controlled electrodeposition of nano ZnO on a long fiber substrate; (c) SEM image of dense nano ZnO; (d) SEM image of porous nano ZnO; (e) schematic diagram of ZnO electrodeposition mechanism

Fig. 2. Effect of movement speed of reaction tank on the electrodeposition of ZnO. (a) Schematic diagram; (b)-(f) morphologies of ZnO at movement speeds of 0.16 cm/s, 0.33 cm/s, 0.67 cm/s, 1.33 cm/s, and 2.67 cm/s, respectively

Fig. 3. Effect of temperature on electrodeposition behavior and morphologies of ZnO. (a) Electrodeposition behavior of ZnO at different temperatures; (b)-(f) morphologies of ZnO at temperatures of 22 ℃, 24 ℃, 26 ℃, 28 ℃, and 30 ℃, respectively

Fig. 4. SEM images of composite metal fiber and composite metal fiber coated with dense ZnO layer. (a) Surface and (b) partial enlarged view of composite metal fiber; (c) cross sectional view of composite metal fiber; (d) surface and (e) partially enlarged view of composite metal fiber coated with dense ZnO layer; (f) cross section view of composite metal fiber coated with dense ZnO layer

Fig. 5. SEM images of nano ZnO layer grown at different reaction temperatures. (a) (b) 90 ℃; (c) (d) 70 ℃; (e) (f) 50 ℃; (g) (h) 30 ℃

Fig. 6. SEM images of nano ZnO at different hydrothermal reaction solution concentrations and the performance of corresponding fiber solar cells. (a) 0.01 mol/L; (b) 0.02 mol/L; (c) 0.03 mol/L; (d) 0.04 mol/L; (e) 0.05 mol/L; (f) performance of corresponding fiber solar cells

Fig. 7. SEM images of nano ZnO at different hydrothermal reaction solution volume and the performance of corresponding fiber solar cells. (a) 60 mL; (b) 70 mL; (c) 80 mL; (d) 90 mL; (e) 100 mL; (f) performance of corresponding fiber solar cells

Fig. 8. SEM images of fiber electrode grown with ZnO nanoarrays and fiber electrode coated with CuI. (a) Surface of ZnO nanoarrays; (b) enlarged view of surface of ZnO nanoarrays; (c) cross section of ZnO nanoarrays; (d) surface of CuI; (e) enlarged view of surface of CuI; (f) cross section of CuI

Fig. 9. Performance of fiber dye sensitized solar cells. (a) Short circuit current density and open circuit voltage at different light intensities; (b) current density-open circuit voltage curve of the batteries in series; (c) current density-open circuit voltage of the batteries in parallel; (d) current density-open circuit voltage curve before and after bending; (e) short circuit current density and open circuit voltage after different bending times; (f) current density-open circuit voltage curve before and after being soaked in water