ELEKTROLIT SEMIPADAT BERBASIS KITOSAN SEBAGAI ELEKTROLIT REDOKS DALAM SEL SURYA TERSENSITISASI ZAT WARNA; CHITOSAN-BASED GEL REDOX ELECTROLYTE FOR DYE SENSITIZED SOLAR CELL

Hatmanto, Adhi Dwi, Indriana Kartini

2015 | Disertasi | FMIPA

Chitosan-based gel electrolytes for quasi-solid state dye sensitized solar cell (DSSC) have been prepared. The effects of different iodide salts, 1-propyl-3-methylimidazolium iodide (PMII), and polyaniline on the conductivity and redox cycle of the electrolyte, as well as the performance of chitosan-based gel electrolyte in quasi-solid state DSSC were studied. Effect of iodide salts on the electrolyte performance was studied by preparing chitosan-based gel electrolytes using various iodide salts, such as LiI, NaI, KI, and CsI, while the effects of PMII and polyaniline were studied by preparing chitosan-based gel electrolyte at various concentrations of PMII and polyaniline. Conductivity of the electrolyte was determined by conductometry, while the redox cycle was studied by cyclic voltammetry method. Furthermore, the performance of chitosan-based gel electrolyte that showed the highest anodic-cathodic peak current intensity and conductivity from each study was tested in a quasi-solid state DSSC. The results showed that intensity of anodic-cathodic peak current and conductivity of the electrolyte increased with increasing cation size of the iodide salts and concentration of PMII. They also increased by using polyaniline, but the transparency of the electrolyte decreased, thus lowering the solar cell’s efficiency. Gel electrolyte prepared from chitosan and KI/PMII (at 80%:20% by mol/mol) showed the highest performance. The HOMO, LUMO, and Egap of N719 dyes are 0.876 V (vs NHE); -1.243 V (vs NHE); and 2.119 eV, respectively. DSSC fabricated using chitosan/KI-PMII gel electrolyte and N719 dyes showed open circuit voltage (Voc) of 0.402 V, short circuit current density (Jsc) of 0.335 mA/cm2, fill factor (FF) of 0.432, and conversion efficiency (?) of 0.058%.

Kata Kunci : chitosan; electrolyte; redox; conductivity; cyclic voltammetry