| Electrochromic materials have been tepid in the past few decades,but in recent years they have suddenly become a hotspot in the research direction of functional materials.Because the electrochromic material is applied with an AC potential,the material can undergo optical reversible changes and energy storage and release.This functional material is used in smart windows,military camouflage,functional packaging,anti-corrosion materials,satellite thermal control and other fields due to its unique properties.Among the many electrochromic materials,inorganic electrochromic material tungsten oxide?WO3?and organic electrochromic material polypyrrole?PPy?have advantages such as excellent conductivity,large optical contrast,and good environmental stability.,And is widely researched and applied in many fields.At present,although there have been studies reported on the synthesis of WO3 and PPy electrochromic films,there are still some unresolved problems,such as single-electrode electrochromic materials can no longer meet the functionalization of multifunctional electrochromic devices Chromogenic materials can realize the accumulation of the advantages of a single material and weaken its shortcomings.Therefore,this paper proposes to improve the optical modulation range,response time,coloring efficiency and cycle stability of WO3 and PPy electrochromic thin films by means of doping,porous structure design and optimization of preparation time.based on optimizing materials,an electrochromic energy storage dual-function electrochromic device was constructed.Its research content is mainly divided into the following two parts:?1?Preparation and performance of THMS/WO3 electrochromic film and energy storage deviceTHMS/WO3 electrochromic film was prepared on FTO conductive glass by electrochemical deposition method.The electrochromic performance was optimized by adjusting the ratio of sodium tungstate dihydrate?Na WO4·2H2O?to THMSs.Further,a series of characterization methods were used to analyze its apparent morphology,constituent elements,and electrochromic properties.It was found that the doping of THMSs changed the apparent morphology and structure of WO3 films,and then affected its electrochromic properties.When the weight ratio of Na WO4·2H2O to THMSs is 15:1,the obtained THMS/15WO3electrochromic film has the best comprehensive performance.For example,the optical control range at 700 nm reaches 57.89%and the coloring efficiency 88.84 cm2/C-1.The excellent performance of the hybrid film is mainly due to the doping of THMSs to change the dense structure of the WO3 film,forming a porous structure with a large specific surface area,which provides more free space for ion insertion and extraction.Using the THMS/15WO3 thin film prepared under the best conditions as the electrochromic layer,a THMS/15WO3//FTO electrochromic energy storage dual function device was constructed,and then the device was connected in series with a red LED lamp to form a loop to explore its storage Performance.The THMS/WO3 film and electrochromic energy storage dual-function device constructed in this article provide new ideas and important references for the development of new energy storage smart windows in the future.?2?Preparation and performance of p TS/PPy electrochromic film and energy storage devicepTS/PPy multifunctional electrochromic film composed of cauliflower-like particles was prepared by a constant-voltage electrochemical deposition method,simultaneous switching of dual functions of electrochromic and capacitive characteristics was achieved.By adjusting the electrochemical polymerization time,films with different appearances and structures can be obtained.The optimized film has many nanopore structures,which provide more reactive area for them.When the electrochemical deposition time is 100 s,the comprehensive performance of p TS/PPy electrochromic film reaches the best.The optical modulation range at 600 nm is 74.4%,the coloring efficiency is 254.7 cm2/C-1,and the area capacitance at 0.1A/cm2 is 34.2 F/cm2.The excellent performance of the film is mainly attributed to the increase of the conductivity of the film and the provision of more reactive sites for the film due to the introduction of anions.Using p TS/PPy electrochromic film as the electrochromic layer and FTO conductive glass as the ion storage layer,a p TS/PPy//FTO electrochromic energy storage dual-function device was constructed,and its optical transmittance and energy storage performance were tested. |
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