Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials

Addressing the intricate challenge of charge balancing in hybrid and asymmetric supercapacitors, this work proposes a robust methodology. By outlining specific conditions dependent on loaded mass and charge –discharge current or sweep rate, it offers comprehensive insights. Explore these strategies in detail within the extensive table of contents, providing a nuanced understanding of effective charge balancing across positive and negative electrodes. AbstractAn electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative electrodes. Beyond harnessing capacitive, pseudocapacitive, or Faradaic energy storage mechanisms and enhancing electrochemical performance at high rates, achieving a balance of stored charge across electrodes poses a significant challenge over a wide range of charge –discharge currents or sweep rates. Consequently, fabricating hybrid and asymmetric supercapacitors demands precise electrochemical evaluations of electrode materials and the development of a reliable methodology. This work provides an overview of fundamental aspects related to charge-storage mech anisms and electrochemical methods, aiming to discern the contribution of each process. Subsequently, the electrochemical properties, including the working potential windows, rate capability profiles, and stabilities, of various families of electrode materials are explored. It is then demonstrated, how c...

Source: Small - April 4, 2024 Category: Nanotechnology Authors: Mohammad Qorbani, Kuei ‐Hsien Chen, Li‐Chyong Chen Tags: Review Source Type: research