Ferrites for Electrochemical Supercapacitors

Abstract Ferrite materials are being widely envisaged in magnetic, electronic, and microwave devices. They exhibit high resistivity and low eddy current losses which make them a better choice over metals. Apart from their promising magnetic properties, ferrite nanostructures have great impact on next generation needs for designing energy storage devices such as hybrid electric vehicles, mobiles, etc. This chapter presents applications of ferrites in diverse fields from magnetic devices to energy storage devices. Their role in electrical properties such as charge storage arises from the fast-reversible surface faradaic reactions occurring at electrode/electrolyte interface. The rate of redox reaction can control the electrical charge transport of pseudo materials. Recently, the interest in the development of high performance electrode materials for supercapacitors has increased intensively. In particular, the negative electrodes with high specific capacitance, wide range of operating potential, high redox activity, low cost, abundant availability, and ecofriendliness are highly desirable to obtain scalable supercapacitors. Ferrites have proved to be promising negative electrodes in supercapacitors, and in this chapter we have briefed the recent developments of composites with special architectures such as unitary, binary, mixed, and composite ferrite structures, which are considered to be a promising approach to improve charge transfer reaction kinetics. A separate section signifying future perspectives is also provided with various thoughts at the end of the chapter.