title: Asymmetric Supercapacitor Electrodes and Devices.
abstract: The world is recently witnessing an explosive development of novel electronic and optoelectronic devices that demand more-reliable power sources that combine higher energy density and longer-term durability. Supercapacitors have become one of the most promising energy-storage systems, as they present multifold advantages of high power density, fast charging-discharging, and long cyclic stability. However, the intrinsically low energy density inherent to traditional supercapacitors severely limits their widespread applications, triggering researchers to explore new types of supercapacitors with improved performance. Asymmetric supercapacitors (ASCs) assembled using two dissimilar electrode materials offer a distinct advantage of wide operational voltage window, and thereby significantly enhance the energy density. Recent progress made in the field of ASCs is critically reviewed, with the main focus on an extensive survey of the materials developed for ASC electrodes, as well as covering the progress made in the fabrication of ASC devices over the last few decades. Current challenges and a future outlook of the field of ASCs are also discussed.
authors.affiliation: NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA.
authors.forename: Nitin
authors.initials: N
authors.lastname: Choudhary
authors.affiliation: NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.affiliation: NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA.
authors.forename: Julian
authors.initials: J
authors.lastname: Moore
authors.affiliation: Center for Advanced Turbines and Energy Research (CATER), Mechanical and Aerospace Engineering University of Central Florida, Orlando, FL, 32826, USA.
authors.forename: Narasimha
authors.initials: N
authors.lastname: Nagaiah
authors.affiliation: NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA.|Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32826, USA.|Department of Chemistry, University of Central Florida, Orlando, FL, 32826, USA.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhai
authors.affiliation: NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA.|Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32826, USA.|Department of Electrical and Computer Engineering, University of Central Florida, Orlando, FL, 32826, USA.
authors.forename: Yeonwoong
authors.initials: Y
authors.lastname: Jung
authors.affiliation: NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA.|Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32826, USA.|CREOL, College of Optics and Photonics, University of Central Florida, Orlando, FL, 32826, USA.
authors.forename: Jayan
authors.initials: J
authors.lastname: Thomas
keywords: asymmetric supercapacitors; energy storage; hybrid supercapacitors; supercapacitor electrodes