Wang Bin, Zhao Feifei, Zhang Wu, Li Changyu, Hu Kun, Carnio Brett N, Liu Linhua, Yu William W, Elezzabi Abdulhakem Y, Li Haizeng
Institute of Frontier and Interdisciplinary Science Shandong University Qingdao Shandong 266237 China.
School of Chemistry & Chemical Engineering Shandong University Jinan Shandong 250100 China.
Small Sci. 2023 Jul 13;3(9):2300046. doi: 10.1002/smsc.202300046. eCollection 2023 Sep.
Vanadium oxides are highly valued as electrochromic materials because of their multicolor capabilities. However, their practical applications have been limited due to challenges such as the dissolution of vanadate into aqueous electrolytes, leading to poor long-term stability. Herein, a solution is proposed to the vanadate dissolution issue by utilizing a hybrid electrolyte consisting of tetraethylene glycol dimethyl ether (TEGDME) and water. This electrolyte has the unique ability to form a robust cathode electrolyte interface layer on vanadium oxide electrodes. As a proof of concept, zinc-anode-based multicolor transparent electrochromic displays are prepared using layered potassium vanadate (KVO·1.5HO, KVO) with a TEGDME-water hybrid electrolyte. By soaking the KVO electrode in the hybrid electrolyte, it is demonstrated that KVO has remarkable stability against dissolution. Furthermore, it is shown that KVO has superior electrochromic performance compared to sodium vanadate (NaVO·1.5HO, SVO), due to the wide KVO interlayer spacing. Given the enhanced performance of this hybrid electrolyte and KVO cathode material, a zinc-anode-based electrochromic display prototype is shown to exhibit compelling performance. As such, this work is expected to be a significant catalyst for accelerating the development of vanadate-based electrochromic displays.
钒氧化物因其具备多色显示能力而作为电致变色材料备受重视。然而，由于诸如钒酸盐溶解于水性电解质等问题，导致其长期稳定性较差，从而限制了它们的实际应用。在此，通过使用由四甘醇二甲醚（TEGDME）和水组成的混合电解质，提出了一种解决钒酸盐溶解问题的方案。这种电解质具有在钒氧化物电极上形成坚固的阴极电解质界面层的独特能力。作为概念验证，使用层状钒酸钾（KVO·1.5H₂O，KVO）与TEGDME - 水混合电解质制备了基于锌阳极的多色透明电致变色显示器。通过将KVO电极浸泡在混合电解质中，证明了KVO具有显著的抗溶解稳定性。此外，由于KVO的层间距较大，表明其与钒酸钠（NaVO·1.5H₂O，SVO）相比具有优异的电致变色性能。鉴于这种混合电解质和KVO阴极材料的性能增强，展示了基于锌阳极的电致变色显示器原型具有引人注目的性能。因此，这项工作有望成为加速钒酸盐基电致变色显示器发展的重要催化剂。
