|Title:||Designing Novel Poly(oxyalkylene)-Segmented Ester-Based Polymeric Dispersants for Efficient TiO 2 Photoanodes of Dye-Sensitized Solar Cells||Authors:||Leu Y.-A.
|Keywords:||dye-sensitized solar cells;photoanode;poly(oxyalkylene);polymeric dispersants;titanium oxide nanoparticle||Issue Date:||2018||Journal Volume:||10||Journal Issue:||44||Start page/Pages:||38394-38403||Source:||ACS Applied Materials and Interfaces||Abstract:||
A family of new polymeric dispersants, branched poly(oxyethylene)-segmented esters of trimellitic anhydride adduct (polyethylene glycol-trimethylolpropane-trimellitic anhydride, designated as PTT), were synthesized and utilized to homogeneously disperse TiO 2 nanoparticles. The weight fraction of poly(oxyethylene)-segment in the dispersants and the molecular architecture in favoring the branched shape are two predominant factors for designing the effective dispersants. In particular, the poly(oxyethylene) block of 1000 g/mol from PEG1000 as the starting material and a total molecular weight of 12 000 g/mol have constituted the polymeric dispersants for the best performance for homogenizing TiO 2 nanoparticles. The dispersant structures were characterized by using Fourier-transform infrared spectroscopy, acid value determination, and gel permeation chromatography. The TiO 2 dispersibility was evaluated by dynamic light scattering and transmission electron microscopy. The synthesized dispersants were utilized to homogenize the as-prepared TiO 2 , further fabricated into films of photoanodes for dye-sensitized solar cells (DSSCs). The ultimate performance of DSSC was measured to be 8.17 ¡Ó 0.13% for the device efficiency (£b) which was significantly higher than the conventional TiO 2 photoanode at £b = 7.14 ¡Ó 0.12%. The photoanode film was characterized by X-ray diffraction, Brunauer-Emmett-Teller surface area, and dye-loading amount measurements. The kinetics of photogenerated electron in the photoanode, including electron lifetime and electron transit time of the film, was studied via electrochemical impedance spectroscopy, intensity-modulated photocurrent spectroscopy, and intensity-modulated photovoltage spectroscopy. ? 2018 American Chemical Society.
|Appears in Collections:||化學工程學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.