Electrochemical interfaces in ionic liquids/deep eutectic solvents incorporated with water: A review

Ionic Liquids (ILs) and deep eutectic solvents (DESs) are promising candidate electrolytes in electrochemical fields due to their excellent properties. They can absorb water from the environment quickly, the existence of water in ILs/DESs benefits or harms their performance depending on the purpose of the applications. Therefore, studies on the effect of water on the properties of ILs/DESs have received much attention in recent years. This mini-review provides an overview of the structure of the electrochemical interface in ILs/DESs incorporated with water by summarizing the information acquired from a variety of characterization technologies and simulations. Both our understanding of the interfacial structure and our perspective on further research in the field are presented.