| Abstract Scope |
Electrochromic materials capable of independently modulating visible and near-infrared absorbance are crucial for developing smart windows in buildings and electric vehicles for light and heat control. Achieving optimal electrochromic properties requires precise synthetic control to target structures with ideal composition, phase, and surface characteristics that are compatible with electrochemical processes. We present new chemical and electrochemical methods to leverage solution-mediated solid-solid transformations – starting with electrochemically inert nanoparticles and facilitating cation diffusion – to form new compositions and structures. We will show two examples, where a chemical solid-solid transformation reaction allows for decoupling of composition and phase, revealing key parameters that enhance the coloration efficiency of electrochromic materials, and an electrochemical solid-solid transformation, which allows for the direct synthesis of electrochemically compatible, transparent charge storage materials with optimal composition and phase. Additionally, we compare chemical and electrochemical transformations in classical materials systems to highlight different driving forces and outcomes. |