Emerging Pseudocapaciting Materials

Current environmental problems are largely the consequence of the recent growing trends in global energy demand and its utilization, which ultimately resulted in the motivation to develop new routes to explore new energy materials. In response to this, supercapacitors have drawn much attention due to their relatively high power densities and long life cycles as compared to other energy devices. Supercapaciting materials are roughly divided into electric double-layer capaciting materials and pseudocapaciting materials. Between them, pseudocapacitor materials are attractive due to their high specific capacitance, which can lead to increased energy densities in the supercapacitors. In this chapter, we discuss the different types of pseudocapaciting materials, including pseudocapaciting nanoparticles developed based on the glycerate template method, composite pseudocapaciting materials consisting of nanosheets and/or nanoplates, negative electrode pseudocapaciting materials, and other emerging pseudocapaciting materials. In each category, the material selection, structural variations, and electrochemical performances of the pseudocapaciting materials will be addressed, respectively. Not only the state of art progress of the field is presented, but also the future development trends are discussed accordingly.