期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 19, 页码 7351-7357出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c12392
关键词
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资金
- European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013/ERC) [321339]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2089/1 -390776260]
Electrochromic thin films based on covalent organic frameworks (COFs) exhibit high coloration efficiency and fast switching speeds, with reversible absorption changes of close to 3 OD triggered at low operating voltages and low charge per unit area. The champion material reaches a coloration efficiency of 858 cm(2) C-1 at 880 nm and maintains >95% of its response over 100 oxidation/reduction cycles, with extremely fast response times below 0.4 seconds for oxidation and around 0.2 seconds for reduction.
Electrochromic coatings are promising for applications in smart windows or energy-efficient optical displays. However, classical inorganic electrochromic materials such as WO3 suffer from low coloration efficiency and slow switching speed. We have developed highly efficient and fast-switching electrochromic thin films based on fully organic, porous covalent organic frameworks (COFs). The low band gap COFs have strong vis-NIR absorption bands in the neutral state, which shift significantly upon electrochemical oxidation. Fully reversible absorption changes by close to 3 OD can be triggered at low operating voltages and low charge per unit area. Our champion material reaches an electrochromic coloration efficiency of 858 cm(2) C-1 at 880 nm and retains >95% of its electrochromic response over 100 oxidation/reduction cycles. Furthermore, the electrochromic switching is extremely fast with response times below 0.4 s for the oxidation and around 0.2 s for the reduction, outperforming previous COFs by at least an order of magnitude and rendering these materials some of the fastest-switching frameworks to date. This combination of high coloration efficiency and very fast switching reveals intriguing opportunities for applications of porous organic electrochromic materials.
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