Enhancing dye-sensitized solar cell performance; optimization of quaternary counterion-based gel polymer electrolyte without changing additives or net-ion composition

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
T. M. W. J. Bandara, K. M. S. P. Bandara, H. M. N. Wickramasinghe, L. R. A. K. Bandara, N. M. Adassooriya, Kapila Wijayaratne
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引用次数: 0

Abstract

A series of novel gel polymer electrolytes (GPEs) was developed for quasi-solid-state dye-sensitized solar cells (DSSCs), to enhance their performance via mixed counterion effect. Here, LiI, CsI, tetrahexylammonium iodide (Hex4NI), and 1-methyl-3-propylimidazolium iodide (MPII) were used as iodide salts for the preparation of this new GPE. The electrolyte series was investigated by varying the molar fractions of LiI and CsI, keeping the molar fractions of Hex4NI and MPII constant. The molar composition of the iodide salts in electrolytes is MPII0.25(Hex4NI)0.8CsI(2-x)LiIx, where x is the variable. The temperature dependence of conductivity showed Vogel-Tammann-Fulcher behavior. The sample with x = 0.72, where LiI to CsI to Hex4NI to MPII molar ratio is 72:48:80:25, which gave 8.42 mS cm−1 at 30 °C, displayed the maximum conductivity at all the temperatures. The dependence of the complex AC conductivity on frequency is examined in detail to study the impacts of dielectric polarization effects of the GPEs. Quasi-solid-state DSSCs were constructed by utilizing six-layered TiO2 photoelectrodes, Pt counter electrode, and the novel GPE series. The three-salt electrolytes, containing LiI only and CsI only, containing DSSC showed efficiencies of 5.72% and 3.53% respectively. The four-salt system, which is composed of LiI to CsI to Hex4NI to MPII with a molar ratio of 96:24:80:25, demonstrated the highest solar cell efficiency of 7.42%, due to the collective contribution of Hex4N+, MPI+, Cs+, and Li+ ions in improving the charge transport in the electrolyte system. This study shows that DSSC performance can greatly be improved by optimizing counterion ratios without changing total ions in the electrolyte.

Graphical abstract

Abstract Image

提高染料敏化太阳能电池的性能;在不改变添加剂或净离子成分的情况下优化基于季反离子的凝胶聚合物电解质
为准固态染料敏化太阳能电池(DSSC)开发了一系列新型凝胶聚合物电解质(GPE),以通过混合反离子效应提高其性能。在这里,LiI、CsI、四己基碘化铵(Hex4NI)和 1-甲基-3-丙基咪唑鎓碘化物(MPII)被用作制备这种新型 GPE 的碘盐。通过改变 LiI 和 CsI 的摩尔分数,同时保持 Hex4NI 和 MPII 的摩尔分数不变,对电解质系列进行了研究。电解液中碘盐的摩尔组成为 MPII0.25(Hex4NI)0.8CsI(2-x)LiIx,其中 x 为变量。电导率的温度依赖性表现为 Vogel-Tammann-Fulcher 行为。x = 0.72 的样品,即 LiI、CsI、Hex4NI 和 MPII 的摩尔比为 72:48:80:25,在 30 °C 时的电导率为 8.42 mS cm-1,在所有温度下都显示出最大电导率。详细研究了复合交流电导率对频率的依赖性,以研究 GPE 的介电极化效应的影响。利用六层 TiO2 光电极、铂对电极和新型 GPE 系列构建了准固态 DSSC。仅含 LiI 和仅含 CsI 的三盐电解质 DSSC 的效率分别为 5.72% 和 3.53%。由 LiI、CsI、Hex4NI 和 MPII 组成的摩尔比为 96:24:80:25 的四盐体系显示出最高的太阳能电池效率,达到 7.42%,这归功于 Hex4N+、MPI+、Cs+ 和 Li+ 离子在改善电解质体系中电荷传输方面的集体贡献。这项研究表明,在不改变电解质中离子总量的情况下,通过优化反离子比例可以大大提高 DSSC 的性能。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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