| Electrochromic windows are an important way to achieve energy saving and smart homes,with a brightness dimming function.However,until now,there are still relatively rare report on simultaneously achieved good performance and multi-functional characteristics in one device.Hence,in this dissertation we focus on multi-functional electrochromic windows of ?-Ni(OH)2 electrochromic-energy storage system and Bi-Cu reversible bimetal electrodeposition system,and achieved the following results:1.Controllable synthesis of high-performance ?-Ni(OH)2 electrochromic(EC)energy storage electrodes and devices.We propose a preheating substrate electrodeposition method for energy-saving and controllable preparation of pure?-Ni(OH)2 thin film.The results show that the ?-Ni(OH)2 electrode exhibits large transmittance modulation range(78.6%),fast switching speed(?1 s),long-term stability(>5000 cycles)and an area capacitance reaches to 154.05 mF cm-2.Characterization results show that by preheating treated the substrate,the as-deposited film is compact and uniform and has strong crystallinity,which avoids the transformation of ?phase to ? phase during preparation and discoloration.This method,with enhance adhesion of the film to the substrate,furtherly increase cycle stability of film.The electrochemical characterization shows that bigger ionic diffusion coefficient of the film realizes efficient intercalation/deintercalation of ions,which results in fast switching speed.2.Research on flexible multistate smart window based-on Bi-Cu reversible bimetal electrodeposition.By accurately controlling nucleation-growth process of bimetals,we prepare a flexible multistate smart window based-on Bi-Cu reversibly electrodeposition system.The results show that the device has five optical states,namely transparent state,grey state,black state,cupreous mirror state,and silvery mirror state.The transmittance modulation range reaches to 63%and the reflectance modulation range reaches to 60%.The device also possesses good flexible compatibility.Characterization results show that the average particle size of the grey state is>300 nm,and the average particle size of the black state is>400 nm.Surface of the above two particles is rough,resulting in the film exhibiting a neutral color due to plasmon resonance and multiple scattering absorption effects.In another hand,two mirror states possess smooth and uniform surface,and the particle size the mirror states is about 100 nm,which make the device assume a mirror state.Furtherly,when the main component of the film is Cu metal(Bi:Cu=1:99),the device has a reddish reflection color;When Bi accounts for a relatively high proportion of the film(Bi:Cu=2:1),the device exhibits a silver-white reflective state.3.Development of multistate Bi-Cu reversible metal electrodeposition smart window on rigid substrate.By modifying the electrolyte,the EC performance of the device is optimized.The results show that the rigid substrate based smart windows exhibit different five optical states:transparent state,red state,grey state,black state,and copper mirror state.The long cycle performance is up to more than 600 times.The color retention time of black state is up to 24 h and the copper mirror state color retention time is>3h.Characterization results show that the gel electrolyte with good chemical stability and high viscosity can make the metal deposition process more controllable.And,the rigid substrate affects the metal nucleation-growth process,causing the different five states when compared with flexible device. |
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