Over the past decades, dye-sensitized solar cells (DSSCs) have attracted wide-spread scientific and
technological interests due to its low cost and high energy conversion efficiency. DSSC prepared with liquid
electrolyte has reached the efficiency of as high as 15% [1]. However, due to the usage of the liquid electrolyte, it
has the disadvantages of easy evaporation and leakage after long-term lab tests which affect to reduce the long
stability of the DSSC [2]. Thus, considerable efforts have been made to replace the liquid electrolyte with a solid
state electrolyte or quasi-solid-state electrolyte [3], [4]. As a solid-state electrolyte, polymer electrolyte is usually
formed by dissolving alkali metal salts into polymer matrix. However, the performance of a DSSC with polymer
electrolyte is hampered by the low ionic diffusion in the polymer matrix [5], [6]. Therefore, quasi-solid-state
electrolyte, such as polymer gel electrolyte, is formed by liquid electrolyte trapped in the polymer networks. It’s has
been suggested as the best choice for use in DSSCs because high stability and superior ionic diffusion [7]. The
polymer gel electrolyte combines the advantages of solid and liquid electrolytes, such as high stability and superior
ionic diffusion, and can also facilitate the penetration of the electrolyte into the mesoporous TiO2 film. It has been
expected to be a promising candidate for the ideal electrolyte [8], [9]. For instance, Haijun used alkaline polyvinyl
alcohol and potassium iodide (PVA–KOH–KI) as gel electrolyte for quasi-solid-state supercapacitor. The specific
capacitances of the supercapacitor is 236.90 F.g