Qin Wei, Zhou Ningfang, Wu Chun, Xie Mingming, Sun Hengchao, Guo Yan, Pan Likun
College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, People's Republic of China.
Beijing Smart-Chip Microelectronics Technology Co., Ltd., Beijing 100192, China.
ACS Omega. 2020 Feb 19;5(8):3801-3808. doi: 10.1021/acsomega.9b04063. eCollection 2020 Mar 3.
Supercapacitors, also known as electrochemical capacitors, are attracting much research attention owing to their high power density, long-term cycling stability, as well as exceptional safety compared with rechargeable batteries, although the globally accepted quantitative benchmarks on the power density, cycling stability, and safety are yet to be established. However, it should be noted that the supercapacitors generally exhibit low energy density, which cannot satisfy the demands where both high energy density and power density are needed. To date, various methods have been employed to improve the electrochemical performances of supercapacitors. Among them, introducing redox additives (or redox mediators) into conventional aqueous electrolyte is regarded as one of the most promising strategies. The redox additives in aqueous electrolyte are widely demonstrated to be able to increase the charge storage capability via redox transformation and thus enhance the electrochemical performances. Herein, we present a brief review on the classification, state-of-the-art progress, challenges, and perspectives of the redox additives in aqueous electrolyte for high performance supercapacitors.
超级电容器，也被称为电化学电容器，由于其高功率密度、长期循环稳定性以及与可充电电池相比具有卓越的安全性，正吸引着众多研究关注，尽管关于功率密度、循环稳定性和安全性的全球公认定量基准尚未确立。然而，应当注意的是，超级电容器通常表现出低能量密度，无法满足同时需要高能量密度和功率密度的需求。迄今为止，已经采用了各种方法来改善超级电容器的电化学性能。其中，将氧化还原添加剂（或氧化还原介质）引入传统水性电解质被认为是最有前景的策略之一。水性电解质中的氧化还原添加剂已被广泛证明能够通过氧化还原转化提高电荷存储能力，从而增强电化学性能。在此，我们简要综述了用于高性能超级电容器的水性电解质中氧化还原添加剂的分类、最新进展、挑战及展望。
