CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hongying Liu,Mengying Wang,Xu Wang,Agnieszka Pawlicka,Xungang Diao
3D, porous, low-dimensional, and nanostructured V 2 O 5 films have significant potential for application in ECDs, but their development is still in its nascency. This paper reports a facile strategy of using PEG as a structure-directing agent and short-time heat treatments to obtain 3D, porous, and hierarchical V 2 O 5 films comprising interpenetrating stacked ultra-long nanowire surfaces and nanorod/nanosheet mixed interiors deposited on ITO-glass substrates. The mechanism of morphological transformation was studied in detail, and the analysis shows that the formation of such special structured films is a synergetic result of the guided intercalation of PEG, atomic rearrangement, Ostwald ripening, anisotropy of crystal growth, and orientation attachment mechanism. Among them, the preferred PEG addition amount of 25 % for the 350-3-V 2 O 5 film was applied in two types of all-solid-state ECDs: one using a gel quasi-solid electrolyte and the other using a solid-film electrolyte. The 350-3-V 2 O 5 film served as an ion storage coating and WO 3 was the electrochromic layer. These devices achieved ideal reversible switching of transmissive-to-black electrochromic characteristics. Notably, the ‘Integrated-Type’ ECD, composed of inorganic all-solid-state films, has a large optical modulation range ΔT = 72.0 %, rapid switching responses (colouration 25.4 s and bleaching 20.8 s), and sustained electrochromic performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Hongying Liu,Xiaoping Liang,Tao Jiang,Yuanyang Zhang,Shiwei Liu,Xuezhuang Wang,Xiaowei Fan,Xuguo Huai,Yadong Fu,Zhenbo Geng,Dequan Zhang
Nanoscale V 2 O 5 films possess excellent electrochemical properties and have great potential for application in electrochromic devices. Herein, we report a novel strategy for the transformation of three-dimensionally ordered macroporous(3DOM) V 2 O 5 films into V 2 O 5 nanorods film using a simple low-temperature annealing treatment, in which the heterogeneous nucleation sites provided by PS colloidal sphere surface, the anisotropic bonding of V 2 O 5 , atomic rearrangement, and Ostwald ripening are all important factors affecting the morphological transformation. According to this study, during the preparation of 3DOM V 2 O 5 films, a small number of oxygen vacancies were introduced into the V 2 O 5 lattice, and the annealing treatment (250–400 °C, 4–8 h) controlled the concentration of oxygen vacancies. Compared with the ion storage capacity of V 2 O 5 films prepared by conventional sol-gel dip-coating method (17.79 mC cm −2 for unannealed V 2 O 5 films and 13.90 mC cm −2 for V 2 O 5 films after 6 h of annealing at 350 °C), the 350°C-6h films with nanorod structure had the highest ion-storage performance, the initial value raised to 98.77 mC cm −2 . Further, the cycling stability was excellent, with only a 6.1% decrease after 5000 cycles. This was because of the special nanorod structure and the presence of a certain number of gradient oxygen vacancies in the 350°C-6h film. The 350°C-6h film also had good electrochromic properties, a wide range of transmittance modulation (73.6%), and a fast response time (3.2 s for coloring and 3.9 s for bleaching). In addition, electrochromic devices (ECDs) with 350°C-6h films as both ion-storage layers and electrochromic layers have been successfully assembled, which exhibit high performance.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·Vol. 107
·期 3
·548-559
·
IF 2.5
Pan Zixin,Liang Xiaoping,Yan Su,Zeng Jing,Bai Jinshuo,Zhang Dequan,Yang Guixiang,Liu Zhifeng
Electrochromic glass, one of the green energy-saving building materials, get more and more attention. The advancement of efficient ion storage film become a hot topic of research. The porous V 2 O 5 ion-storage film was prepared by sol-gel method using polyethylene glycol (PEG) as the pore-former. The peak current of porous V 2 O 5 films heated at 300 °C increased substantially due to the volatility temperature of PEG at 285 °C. The mutual effects of the PEG content, heat treatment temperature, and heat treatment time on the structure and electrochromic properties of porous V 2 O 5 film were investigated by the response surface method (RSM). The results show that the influence extent on ion storage is: heat treatment temperature > PEG content > heat treatment time. Under optimized process parameters of PEG content 6.2 g/100 mL sol, heat treatment time 4 h, heat treatment temperature 310 °C, the porous V 2 O 5 film exhibited excellent ion storage capacity (87.28 mC·cm −2 ). The electrochromic device (ECD) with optimized porous V 2 O 5 ion-storage film as the counter electrode of electrochromic WO 3 film has been successfully assembled, which shows fascinating performance with high optical contrast (87.8% at 550 nm) and fast response time (bleaching/coloring: 4.5/3.7 s). Graphical Abstract
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Zhu Xueli,Yin Xiangru,Zhang Yinan,Mei Qiqi,Bai Jinshuo,Yang Guixiang,Zhang Dequan,Liang Xiaoping
V 2 O 5 films with high ion storage capacity (Q) and wide optical modulation range (∆T) have great potential for application in electrochromic devices. In this paper, Ni-La-V 2 O 5 porous ion storage films are prepared by the sol–gel method. The effects of Ni-La co-doping content, PEG content, and heat treatment temperature on the properties of V 2 O 5 films were investigated. By comparison, it was found that the Q value of 9 mol% Ni-5.5 mol% La-V 2 O 5 film was increased compared to 9 mol% Ni-V 2 O 5 film, but ∆T was decreased. In order to improve ∆T, Ni-La-V 2 O 5 porous ion storage films were prepared using Ni-La co-doping and PEG pore-former, and the optimization of process parameters was carried out via Response Surface Methodology (RSM). The RSM results showed that the influence on the Q value was in the following order: heat treatment temperature > Ni-La co-doping content > PEG content. Under the near-optimal process parameters, a satisfying V 2 O 5 film with a high Q value (120.23 mC/cm 2 ), a good ∆T (79.8%), and a short response time (3.1 s/2.8 s) were obtained, which further demonstrated the superior electrochromic performance. Graphical
研究领域:
材料科学
·
电致变色技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）