NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA.
Center for Advanced Turbines and Energy Research (CATER), Mechanical and Aerospace Engineering University of Central Florida, Orlando, FL, 32826, USA.
Adv Mater. 2017 Jun;29(21). doi: 10.1002/adma.201605336. Epub 2017 Feb 28.
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.
近年来，世界见证了新型电子和光电子器件的爆炸式发展，这些器件需要更可靠的电源，兼具更高的能量密度和更长的耐久性。超级电容器作为最有前途的储能系统之一，具有高功率密度、快速充放电和长循环稳定性等多重优势。然而，传统超级电容器固有的低能量密度严重限制了它们的广泛应用，促使研究人员探索具有改进性能的新型超级电容器。使用两种不同电极材料组装的不对称超级电容器 (ASC) 具有宽工作电压窗口的独特优势，从而显著提高了能量密度。本文批判性地回顾了 ASC 领域的最新进展，重点广泛调查了用于 ASC 电极的材料，并涵盖了过去几十年中 ASC 器件制造方面的进展。还讨论了该领域当前的挑战和未来展望。
