摘要
The distinctive multicolor characteristics of vanadium oxide(V₂O₅)set it apart from other inorganic electrochromic materials.Nevertheless,its practical applications are considerably constrained by several factors,including solubility in aqueous electrolytes,inferior conductivity,and especially limited light modulation.In this study,we introduce an innovative approach for the preparation of ultra-small V₂O₅nanodots,which are expected to offer an increased number of active sites,thereby improving the efficiency of redox reactions.A comparative analysis of the performance of the V₂O₅electrode in different cation electrolytes shows that Li⁺serves as the most suitable match due to its small ionic radius and monovalent nature.As a result,the V₂O₅electrochromic electrode demonstrates exceptional electrochromic performance,characterized by its ability to undergo wide-band adjustments attributable to the polarization reactions associated with cation insertion.As a proof of concept,we utilized V₂O₅nanodots and a Zn²⁺/Li⁺electrolyte to develop a multicolor transparent electrochromic display using zinc as the anode.Given the enhanced performance of the Zn²⁺/Li⁺electrolyte and the V₂O₅nanodot cathode,the prototype of the electrochromic display exhibits impressive performance,such as optical contrasts of 61.2%(728 nm)and 50.2%(1200 nm),a bleaching time of 8.5 s,a coloring time of 10.4 s,and an energy recovery efficiency of 31.65%.This work provides a significant material foundation for advancing vanadate-based electrochromic display technology and offers valuable insights into the selection of electrolytes for vanadate devices.
基金
the Shandon Provincial Natural Science Foundation of China(ZR2023QE297)
the Dezhou University University-level Scientific Research Fund(2022xjrc411)
the Open Foundation of the Shandong Provincial Engineering Research Center of Organic Functional Materials and Green Low-Carbon Technology,the Qingchuang Science and Technology Plan of Shandong Province(2023KJ267)
the Open Foundation of the State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization(2023P4FZG08A)
the National Natural Science Foundation of China(22409203)
the Natural Science Foundation of Shandong Province(2023HWYQ-104)
the Taishan Scholars Program(no.tsqn202306310)
the Qingdao Natural Science Foundation(23-2-1-22-zyyd-jch).
