[논문]Quasi-Solid-State Polymer Electrolytes Based on a Polymeric Ionic Liquid with High Ionic Conductivity and Enhanced Stability

Jeon, Nawon; Jo, Sung-Geun; Kim, Sang-Hyung; Park, Myung-Soo; Kim, Dong-Won

doi:10.5229/jecst.2017.8.3.257

Quasi-Solid-State Polymer Electrolytes Based on a Polymeric Ionic Liquid with High Ionic Conductivity and Enhanced Stability 원문보기

Journal of electrochemical science and technology, v.8 no.3, 2017년, pp.257 - 264

Jeon, Nawon (Department of Chemical Engineering, Hanyang University) , Jo, Sung-Geun (Department of Chemical Engineering, Hanyang University) , Kim, Sang-Hyung (Department of Chemical Engineering, Hanyang University) , Park, Myung-Soo (Department of Chemical Engineering, Hanyang University) , Kim, Dong-Won (Department of Chemical Engineering, Hanyang University)

Abstract ▼ AI-Helper

A polymeric ionic liquid, poly(1-methyl 3-(2-acryloyloxypropyl) imidazolium iodide) (PMAPII), was synthesized as a single-iodide-ion-conducting polymer and employed in a gel polymer electrolyte. Gel polymer electrolytes prepared from iodine, 4-tert-butylpyridine, ${\gamma}$-butyrolactone, and PMAPII were applied in quasi-solid-state dye-sensitized solar cells (DSSCs). The addition of 16 wt.% PMAPII provided the most favorable environment, striking a compromise between the iodide ion concentration and the ionic mobility, which resulted in the highest conversion efficiency of the resulting DSSCs. The quasi-solid-state DSSC assembled with the optimized gel polymer electrolyte exhibited a relatively high conversion efficiency of 7.67% under AM 1.5 illumination at $100mA\;cm^{-2}$ and better stability than that of the DSSC with a liquid electrolyte.

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가설 설정

All the spectra exhibit three semicircles, which can be assigned to the electr℃hemical reaction at the Pt counter electrode (R_ct1), the charge transfer reaction at the TiO₂ electrode (R_ct2), and the Warburg diffusion process of I^-/I₃^-(R_diff). The resistances estimated using the equivalent circuit are given in Table 2. The electrolyte resistance (R_el) is lowest in the DSSC assembled with liquid electrolyte. In the gel-electrolyte DSSCs, the electrolyte resistance decreased with the PMAPII content up to 16 wt.
% and then increased with higher contents, which is consistent with the ionic conductivity results in Fig. 3. When the content of PMAPII was less than 16 wt.%, the observed interfacial resistances (R_ct1 and R_ct2) were high, which may be due to the lack of ions involved in the redox couple (I^-/I₃^-).

제안 방법

The applied bias voltage and ac amplitude were set to the open-circuit voltage and 10 mV, respectively. The impedance spectra were analyzed using an equivalent circuit model to interpret the characteristics of the DSSCs [36-38].
The diffusion-limited current density was determined by cyclic voltammetry at a scan rate of 5 mV s⁻¹. The surface and cross-sectional morphologies of the TiO2 electrodes were examined using a field emission scanning electron microscope (FE-SEM, JEOL, JSM-6710F). The photovoltaic performance of the DSSCs was evaluated using a xenon light source (100 mW cm⁻²) with an AM 1.

대상 데이터

The obtained polymeric ionic liquid (PMAPII) was a flexible solid. The chemical structures of MAPII and PMAPII were confirmed by ¹H NMR spectra using a VARIAN (Mercury 300) NMR spectrometer with a DMSO-d₆ solvent.

성능/효과

The photovoltaic performance of quasi-solid-state DSSCs assembled with these gel polymer electrolytes was investigated and compared to that of the liquid-electrolyte-based DSSC. Our results demonstrated that the DSSC employing the PMAPII-based gel polymer electrolytes exhibited a relatively high conversion efficiency of 7.67% and good long-term stability.

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