Morpholinium salts are characterized by their morpholine ring, which contributes to their unique physicochemical properties in ionic liquids. These salts are known for their high viscosity and low volatility, making them suitable for applications that require stable and long-lasting solutions. Morpholinium-based ionic liquids are used in the formulation of electrolytes for electrochemical devices, such as fuel cells and sensors. They also have applications in catalysis, where their ability to stabilize reactive intermediates can increase the efficiency of chemical reactions. Due to their biocompatibility, morpholinium ionic liquids have also been studied for biomedical applications, such as drug delivery systems.