Flexible and high-performance electrochromic devices enabled by self-assembled 2D TiO2/MXene heterostructures

Abstract Transition metal oxides (TMOs) are promising electrochromic (EC) materials for applications such as smart windows and displays, yet the challenge still exists to achieve good flexibility, high coloration efficiency fast response simultaneously. MXenes (e.g. Ti 3 C 2 T x ) their derived TMOs 2D TiO candidates high-performance flexible EC devices because of nature possibility assembling them into loosely networked structures. Here we demonstrate flexible, fast, high-coloration-efficiency based on self-assembled /Ti heterostructures, with layer transparent electrode, layer. Benefiting from well-balanced porosity connectivity these assembled nanometer-thick they present efficient ion electron transport, well superior mechanical electrochemical stability. We further large-area which could potentially be integrated onto curved surfaces future ubiquitous electronics.