Berlin 2024 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Charged Soft Matter, Polyelectrolytes and Ionic Liquids II
CPP 30.10: Talk
Wednesday, March 20, 2024, 17:30–17:45, H 0107
Equilibrium and resilience to external and internal influences of switchable windows based on metal electrodeposition — •Rebecca Cizek1, Florian Sutter1, Kai Gehrke2, Eckhard Lüpfert1, Stephan Heise2, and Robert Pitz-Paal1 — 1DLR, Institut für Solarforschung, Almeria, Spain — 2DLR, Institut für Vernetzte Energiesysteme, Oldenburg, Germany
To reduce the rising energy demand for climate control in buildings with large window area, switchable windows get increased attention. Such windows can be used on façades of buildings but also on greenhouses. Switchable windows can change their transmittance mostly though an electric stimulus (electrochromic). The investigated windows consist of an electrolyte sandwiched between two electrodes and covered by a closure. The transmittance changes when metal is deposited by applying a voltage (electrodepositon). This process can be reversed either by application of voltage in the opposite direction or over time (hours). The latter, called self-bleaching, is a counteracting process to the electrodeposition. The equilibrium between those processes corresponds to a balance between the deposition and the self-bleaching rate of the metal. We identified the equilibrium voltage and its resilience to several parameters, including internal parameters like composition and viscosity of the electrolyte and the material and surface roughness of the electrodes as well as external parameters like temperature and humidity. This allows optimizing the setup towards lower energy consumption and appropriate transmittance changes for greenhouse application.
Keywords: electrolyte; switchable window; viscosity; transmittance; self-bleaching