Pseudocapacitive Materials for Electrolytes

The electrolyte plays a vital role in the performance and durability of electrochemical energy devices like supercapacitors, fuel cells, and batteries. The electrolyte is usually employed as an aqueous solution but is also found in non-aqueous forms like organic solvents, including protic and aprotic ionic liquids. It is used as a gel or solid polymer electrolyte (GPE/SPE) for flexible applications. The use of pseudocapacitive materials in electrolytes serves different purposes, including mechanical stability and ionic conductivity, to improve the electrode/electrolyte interface and water retention, among others. This chapter discusses the most outstanding achievements in this field, given the prospective improvement of electrochemical energy systems.