Visible light electrochromism based on reversible dissolution/deposition of MnO <sub>2</sub>
Xuan Liu, Hanbing Wang, Junsen Zhong, Menghan Li, Rui Zhang, Dongjiang You, Lingyu Du, Yanfeng Gao, Litao Kang
Abstract
Abstract Electrochromic (EC) windows based on reversible metal electro‐deposition/dissolution (RME) are exciting alternatives to static lighting control using blinds and shades. However, the difficulty of reversibly and uniformly electrodepositing large‐area metal layers seriously hinders the development of RME‐type EC windows. In this paper, we develop a novel EC system based on reversible oxide electro‐deposition/dissolution (ROE) of MnO 2 , achieving a profound and bistable color change between rust brown and completely transparent. This ROE‐MnO 2 system exhibits a significantly high optical modulation amplitude (Δ T ) without any deterioration within 1000 switching cycles (Δ T 550nm actually increases from 44.8 % up to 46.9 % after the cycling test), which is almost double compared to the traditional cation‐insertion/extraction triggered MnO 2 (RCI‐MnO 2 ) EC system. This work may inspire the exploration of novel ROE‐type EC systems.