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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/120171

    Title: Enhanced electrochromic performance of carbon-coated V2O5 derived from a metal–organic framework
    Authors: Hsiao, Yu-Sheng;Cai-Wan, Chang-Jian;Syu, Wei-Lin;Yen, Shih-Chieh;Huang, Jen-Hsien;Weng, Huei-Chu;Lu, Cheng-Zhang;Hsu, Shih-Chieh
    Keywords: Electrochromism;Metal–organic framework;V2O5;Carbon coating;High conductivity
    Date: 2021-03-15
    Issue Date: 2021-03-12 12:11:03 (UTC+8)
    Abstract: In this study we synthesized a vanadium (V)-containing metal–organic framework (MOF) and used it as a template to prepare V2O5 NPs. We used MIL-47, a V-containing MOF having uniform C and V distributions, as a precursor for the preparation of carbon-coated V2O5 (C@V2O5) samples through annealing. The C@V2O5 structures were readily dispersed in poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) to form stable solutions, allowing the deposition of C@V2O5 on various substrates through simple low-temperature solution-based processes. The uniform coating of carbon on V2O5 was useful for two reasons: (i) the outer layer enhanced the electronic conductivity of a V2O5 electrode and its corresponding electrochemical properties and (ii) based on the electrochemical quartz crystal microbalance (EQCM) analysis, the carbon coating served as a buffer layer that allowed Li+ ion transport, but blocked migration of solvent into the V2O5 electrode, thereby improving the dimensional and electrochemical stability. Compared with the bare V2O5, C@V2O5 exhibited excellent electrochromic (EC) performance, with an EC contrast of 45.8%, a mean response time of 3.4 s, and a coloration efficiency of 89.3 cm2/C. C@V2O5 also displayed higher cycling stability (80.6% retention after 5000 cycles) and highly reversible ionic transport during redox reactions, compared with those of the bare V2O5.
    Relation: Applied Surface Science 542, 148498
    DOI: 10.1016/j.apsusc.2020.148498
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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