Evaluation and Optimization to Recycle Used TiO₂ Photoelectrode for Dye-Sensitized Solar Cells

Figure 1

(a) UV-Vis absorption spectra of TiO₂ substrates after desorption using NaOH, CH₃COONa, HCl, CH₃COOH, and DI water with ethanol solutions. UV-Vis absorption spectra of dyed TiO₂ films after immersion in (b) NaOH and (c) CH₃COONa for two minutes and (d) HCl and (e) CH₃COOH solutions for sixteen hours at various concentrations.

(a)

(b)

(c)

(d)

(e)