Novel polymer quaternary ammonium iodide and its application in photoelectrochemical cells

Yangon new technology machine solvent and battery sealant do not match. In order to solve the above problems, various methods have been tried to replace the liquid electrolyte, such as room temperature molten salt w-type semiconductors, inorganic organic hole transport materials, polymer electrolytes, gel polymer electrolytes, and additions in liquid electrolytes. Human small molecule gels. However, due to the compatibility of the inorganic salt and the polymer and the solvent retention ability of the polymer itself, the ionic conductivity (〃) of the gel polymer electrolyte is low, and thus compared with a battery using a liquid electrolyte. The efficiency of solid-state solar cells is still low. This requires research and development of new electrolytes to further improve battery efficiency.

Recently, we synthesized a new type of iridium quaternary ammonium iodide-quaternary ammonium side chain-containing polysiloxane (PSQAS) that can be used with any ratio of plasticizer (ethylene carbonate EC) and propylene carbonate (PC) The mixed solution) is miscible and has a more 'heart' which greatly facilitates reducing the amount of organic solvent used in the electrolyte to obtain a rhodium concentration of the PSQAS electrolyte solution. At the same time, since it is a polymer structure itself, it has a good miscibility with the organic matrix of the polymer, thereby reducing the problems caused by the poor compatibility of the inorganic salt and the polymer, and thus has a good use in the construction of a solid state battery. . In this paper, the ion conductive properties of PSQAS and other inorganic and organic iodine salts at the same concentration were compared. The effect of the concentration on the PSQAS solution was studied. The quasi-solid photoelectrochemical solar cell was assembled by combining it with PAN. Obtained better photoelectric conversion performance.

2 experimental structure of PSQAS see. The synthesis method is as follows: firstly using N,N-dimethylpropenylamine and polymethylhydrogensiloxane (Aldrich, dried under vacuum in 601 for 48 hours) at 90X: hydrosilylation occurs to give the tertiary amine side The functional polysiloxane of the chain is then quaternized with methyl iodide (A,R grade) at 40T: PSQAS. Liquid electrolyte for the measurement of children: with DDS-308A conductivity meter Factory) measurement.

Preparation of gel polymer electrolytes. First dissolve the PSQAS and/or KI in a mixed solvent of EC/PC (WV=8:2), mix the appropriate amount of PAN and the obtained liquid electrolyte with stirring, and seal the resulting suspension in the bottle. Heat to 80X: and maintain this temperature until a viscous solution is obtained. The schematic of the structure of the PSQAS is then cooled and the solution is allowed to reach room temperature.

Gel polymer electrolyte helium measurement: The child was tested at a frequency of 1 kHz using a HIOKIL CR3520 HiTESTER. The sample was placed in a polytetraethylene gasket of known area and thickness, pressed between two stainless steel electrodes and sealed in a test cell.

Preparation of Ti02 nanocrystalline porous thin film electrode: Firstly, TiO2 colloidal solution was prepared by sol-gel method with titanium isopropoxide as precursor. Hydrothermal treatment was performed at 250X: for 20 h. The TiO2 colloids were subjected to rotary evaporation and then dispersed by ultrasonication with a Carbowax M-2000 and then coated on a pre-cleaned surface of SnO2-doped conductive glass (30X1 sheet resistance) at 450X. : Sintering in air for 30 min to obtain Ti02 nanocrystalline porous film electrode. When the electrode is cooled to 80X, it is immediately immersed in 5X10-mol/L 4,4'-dicarboxylic acid bipyridinium dye (cis-dithiocyanato-bis(2,2-dipyridyl-4,dicarboxylic acid) In the anhydrous acetic acid solution, 36h. The composition of the solar cell: The electrode with the dye adsorbed above was rinsed with anhydrous ethanol and dried. The platinum electrode was used as the counter electrode, and the TiQ electrode was evenly coated with electrolysis. The liquid, sandwiched with the counter electrode, constitutes a solar cell.

Photoelectrochemical performance measurement: The photocurrent-photovoltaic characteristic of the battery is a 250 W halogen lamp, with a human emission intensity of 60 mW/cm2 and an illuminated electrode area. 20cm2. 3 Results and discussion in EC/PC (z=8:2) mixed solvents, PSQAS with methyl ethyl imidazolium iodide (MHIml), tetrabutylammonium iodide (TBAI) and potassium iodide (KI) The 1/7' curve for the same concentration (3X1CT4mol.L-1). These curves are in accordance with the Arrehenius equation: where is the ionic conductivity, is the activation energy, i is the gas constant, A is the constant,: T is the absolute temperature, (iO. According to the above equation, the slope from the straight line can be calculated PSQAS, new high Molecular quaternary ammonium iodide salts and their application in photoelectrochemical cells PSQAS compared with other iodized salt conductive properties due to the dissociation activation energy is caused by the enthalpy.From the figure it can be seen that although the corpse 3 8.5 lanthanum than other inorganic The organic iodide salts are especially low compared to MEIml, but they are already in the same order of magnitude as they are comparable. The PSQAS, TBAI, KI and MHIml were 291, 4.86, and 6 at room temperature (25C), respectively. 06 and 6.86X103Scm-1. The decreasing tendency is that the initial increase is due to the increase of the carrier concentration in the solution, while the carrier concentration is no longer due to the formation of the ion cloud and the increase in the viscosity at the helium concentration. Increases and migrations become difficult, and ultimately leads to a decrease in concentration 2. At a concentration of 4.96X1 CT3Scm, this shows that a suitable concentration of PSQAS has a higher conductivity for the photoelectrochemical solar It does not increase the internal resistance of the battery when the cell, thus affecting the charge transfer between the electrodes.

It is a photocurrent-photovoltage characteristic curve of a gel polymer electrolyte quasi-solid photoelectrochemical solar cell composed of different concentrations of PSQAS and PAN. The gel polymer electrolyte helium and the corresponding quasi-solid-state battery photoelectric performance data are listed in Table 1. For ease of comparison, also tested without using PAN conditions using 1.0molL1PSQAS or 03mol.L-1KI and 12 components The electro-optical properties of the liquid electrolyte assembled solar cell are listed in Table 1 together. From Table 1 and Table 1, it can be seen that although the short-circuit photocurrent (Lc) of the quasi-solid battery has decreased compared with the liquid electrolyte solar cell, the open-circuit photovoltage (D and fill factor (//) has increased, eventually resulting in The overall conversion efficiency (7) of the quasi-solid battery is greater than 4%, which is comparable to the liquid electrolyte solar cell.

Table 1 PSQAS "Photoelectric properties of PAN-condensed K polymer electrolyte quasi-solid-state solar cells Sample No. Electrolyte composition Ionic conductivity (Scm-1, 30) Several new technologies for solar energy in the 21st century 4 Conclusion A new type of polymer quaternary ammonium iodide was synthesized. PSQAS.PSQAS can be miscible with plasticizers (mixtures of ethylene carbonate (EC) and propylene carbonate (PC) at any ratio. 0. 3molL-1PSQAS at room temperature (ionic conductivity at 25X) 2.91X103ScnT1 can be compared with commonly used organic and inorganic iodized salt of the same concentration, and has higher ionic conductivity at a suitable concentration, which can meet the needs of photoelectrochemical solar cells.The use of PSQASPAN gel polymer electrolyte structure is accurate Solid-state photoelectrochemical cells have a conversion efficiency of greater than 4% at a light intensity of 60 mWcm2, which is comparable to that of liquid electrolyte photoelectrochemical solar cells.