Deep eutectic solvents (DESs) as low-cost and green electrolytes for electrochromic devicesElectronic supplementary information (ESI) available. See DOI: 10.1039/c7gc00347a

The application of deep eutectic solvents based on choline chloride or lithium chloride with ethylene glycol and glycerol as low-cost, recyclable and green electrolytes for electrochromic devices is reported. Reversible electrochromic devices incorporating DESs as alternative electrolytes and bipyridinium electrochromic probes have been tested and compared to conventional systems. The application of deep eutectic solvents based on choline chloride or lithium chloride with ethylene glycol and glycerol as low-cost, recyclable and green electrolytes for electrochromic devices is reported.