Characterization of Natural Dye Extracted from Wormwood and Purple Cabbage for Dye-Sensitized Solar Cells

Abstract

This study used natural dyes as sensitizers of dye-sensitized solar cells (DSSCs) to replace expensive chemical synthetic dyes. We prepared two natural dyes, chlorophyll dye and anthocyanin dye, by extracting them from wormwood and purple cabbage, respectively. Moreover, we mixed the prepared chlorophyll dye and anthocyanin dye at 5 different volume ratios to form cocktail dyes. For preparation of photoelectrode, P25 TiO2nanoparticles were used to prepare paste, which was coated on fluorine-doped tin oxide (FTO) conductive glass by the spin coating method at different spin coating speeds in order to form TiO2thin films with different thicknesses. The DSSC prepared by the cocktail dye achieves photoelectric conversion efficiency (η) of 1.95%, open-circuit voltage (VOC) of 0.765 V, and short-circuit current density (JSC) of 5.83 mA/cm2. Moreover, the prepared DSSC sensitized solely by chlorophyll extract of wormwood achieved a photoelectric conversion efficiency (η) of 0.9%, whereas the DSSC sensitized solely by anthocyanin extract of purple cabbage achieved a photoelectric conversion efficiency of 1.47%, achieving the longest lifetime of electrons amongst these three dyes.

Anthocyanin-Sensitized TiO2 Nanoparticles for Phenazopyridine Photodegradation under Solar Simulated Light

“…Anthocyanin characteristic IR bands are shown in the regions at ∼1640 cm −1 and ∼3400 cm −1 , like earlier reports [63,64]. These bands are shown for AC/TiO 2 /Anthocyanin before and after the reaction, which indicates that the dye remains intact with the TiO 2 surface during the reaction process.…”

Incorporation of Kojic Acid-Azo Dyes on TiO2 Thin Films for Dye Sensitized Solar Cells Applications

“…KA affords an open circuit voltage ( OC ) of 0.76 V and a short circuit density of 0.32 mA/cm 2 under stimulated power input of 120 W/m 2 . The efficiency of semisynthetic sensitizer KAis comparable with reported natural dye such as chlorophyll and anthocyanin dye [47][48][49] and higher than other heavy metal dyes [39] as well as metal free organic dye [40].…”

Synthesis of TiO2nanoparticles at low hydrothermal temperature and its performance for DSSC sensitized using natural dye extracted fromMelastoma malabathricumL. seeds

“…Band gap energy values for each of the material calculated from graphical extrapolation are shown in Table , which shows that the band gap energy values for each sample sensitized with the extracted dyes are higher than that of TiO 2 nanoparticles from P25 Degussa. The addition of dyes to TiO 2 nanoparticles seems to change the band gap energy slightly, which could be due to the interaction between TiO 2 and the different functional groups of the dyes . The exact reason for this change, however, is yet to be further confirmed.…”

“…The addition of dyes to TiO 2 nanoparticles seems to change the band gap energy slightly, which could be due to the interaction between TiO 2 and the different functional groups of the dyes. 26 The exact reason for this change, however, is yet to be further confirmed.…”