Inorganic metal oxide electrochromic materials have good application prospects for energy-saving windows in buildings and smart display applications.Therefore,the development of electrochromic films with good cycling ...Inorganic metal oxide electrochromic materials have good application prospects for energy-saving windows in buildings and smart display applications.Therefore,the development of electrochromic films with good cycling stabilities,fast color-change response times,and high coloring efficiencies has attracted considerable attention.In this study,nanoflake Li-doped NiO electrochromic films were prepared using a hydrothermal method,and the films exhibited superior electrochromic performances in the LiOH electrolyte.Li^(+)ions doping increased the ion transmission rates of the NiO films,and effectively promoted the transportation of ions from the electrolyte into NiO films.Meanwhile,the nanoflake microstructure caused the NiO films to have larger specific surface areas,providing more active sites for electrochemical reactions.It was determined that the NiO-Li20%film exhibited an ultra-fast response in the LiOH electrolyte(coloring and bleaching times reached 3 and 1.5 s,respectively).Additionally,the coloration efficiency was 62.1 cm^(2)C^(−1),and good cycling stability was maintained beyond 1500 cycles.Finally,the simulation calculation results showed that Li doping weakened the adsorption strengths of the NiO films to OH^(−),which reduced the generation and decomposition of NiOOH and helped to improve the cycling stabilities of the films.Therefore,the research presented in this article provides a strategy for designing electrochromic materials in the future.展开更多
NiO films were fabricated by reactive direct current magnetron sputtering on glass and alumina substrates for the application in energetic nano-multilayers.The structural and thermal properties of the films were inves...NiO films were fabricated by reactive direct current magnetron sputtering on glass and alumina substrates for the application in energetic nano-multilayers.The structural and thermal properties of the films were investigated with the volume ratio of oxygen to argon ranging from 1:9 to 3:2, and the optimized ratio value is obtained as 1:3, which was confirmed by X-ray diffraction(XRD), atomic force microscopy and ultrafast measurement system. The effect of the film thickness, varying from150 to 900 nm, on the structural properties was characterized by XRD and scanning electron microscopy(SEM).XRD analysis reveals that the(111) lattice plane is the preferred orientation. The intensities of preferential peaks and the grain sizes increase as the film thicknesses increase.展开更多
The NiO—Cu composite films were deposited on a glass substrate at various substrate temperatures by DC reactive magnetron sputtering technique.The effect of substrate temperature on the structural,optical, morphologi...The NiO—Cu composite films were deposited on a glass substrate at various substrate temperatures by DC reactive magnetron sputtering technique.The effect of substrate temperature on the structural,optical, morphological and electrical properties of the films was mainly investigated.X-ray diffraction studies revealed that when the substrate temperature increased to above 200℃,the preferred orientation tended to move to another preferred site from(220) to(111) and had a stable cubic structure.The optical transmittance and band gap values increased with increasing substrate temperature.From the morphological studies,it was observed that the grain size and root mean square roughness were increased with increasing substrate temperature.The electrical resistivity of the film decreased to 0.017Ωcm at high substrate temperature of 400℃.展开更多
基金supported by the Key Science and Technology Innovation Team of Shaanxi Province(No.2014KCT-03)Special Support Program for High-level Talents of Shaanxi Province(No.2020-44)China Postdoctoral Science Foundation(No.2019M663990).
文摘Inorganic metal oxide electrochromic materials have good application prospects for energy-saving windows in buildings and smart display applications.Therefore,the development of electrochromic films with good cycling stabilities,fast color-change response times,and high coloring efficiencies has attracted considerable attention.In this study,nanoflake Li-doped NiO electrochromic films were prepared using a hydrothermal method,and the films exhibited superior electrochromic performances in the LiOH electrolyte.Li^(+)ions doping increased the ion transmission rates of the NiO films,and effectively promoted the transportation of ions from the electrolyte into NiO films.Meanwhile,the nanoflake microstructure caused the NiO films to have larger specific surface areas,providing more active sites for electrochemical reactions.It was determined that the NiO-Li20%film exhibited an ultra-fast response in the LiOH electrolyte(coloring and bleaching times reached 3 and 1.5 s,respectively).Additionally,the coloration efficiency was 62.1 cm^(2)C^(−1),and good cycling stability was maintained beyond 1500 cycles.Finally,the simulation calculation results showed that Li doping weakened the adsorption strengths of the NiO films to OH^(−),which reduced the generation and decomposition of NiOOH and helped to improve the cycling stabilities of the films.Therefore,the research presented in this article provides a strategy for designing electrochromic materials in the future.
基金financially supported by the Military Pre-Research fund(No.9140A12040412DZ02138)
文摘NiO films were fabricated by reactive direct current magnetron sputtering on glass and alumina substrates for the application in energetic nano-multilayers.The structural and thermal properties of the films were investigated with the volume ratio of oxygen to argon ranging from 1:9 to 3:2, and the optimized ratio value is obtained as 1:3, which was confirmed by X-ray diffraction(XRD), atomic force microscopy and ultrafast measurement system. The effect of the film thickness, varying from150 to 900 nm, on the structural properties was characterized by XRD and scanning electron microscopy(SEM).XRD analysis reveals that the(111) lattice plane is the preferred orientation. The intensities of preferential peaks and the grain sizes increase as the film thicknesses increase.
基金the University Grants Commission(UGC),New Delhi(File No. F.40-419/2011(SR)) for providing the financial assistance to carry out the above work
文摘The NiO—Cu composite films were deposited on a glass substrate at various substrate temperatures by DC reactive magnetron sputtering technique.The effect of substrate temperature on the structural,optical, morphological and electrical properties of the films was mainly investigated.X-ray diffraction studies revealed that when the substrate temperature increased to above 200℃,the preferred orientation tended to move to another preferred site from(220) to(111) and had a stable cubic structure.The optical transmittance and band gap values increased with increasing substrate temperature.From the morphological studies,it was observed that the grain size and root mean square roughness were increased with increasing substrate temperature.The electrical resistivity of the film decreased to 0.017Ωcm at high substrate temperature of 400℃.
