High‐Performance Mesostructured Organic Hybrid Pseudocapacitor Electrodes |
| |
Authors: | Sung‐Kon Kim Jiung Cho Jeffrey S Moore Ho Seok Park Paul V Braun |
| |
Affiliation: | 1. Department of Materials Science and Engineering and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana‐Champaign, Urbana, IL, USA;2. Advanced Materials Science Research Center, Korea Basic Science Institute, Gangneung, South Korea;3. Department of Chemistry and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana‐Champaign, Urbana, IL, USA;4. School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, South Korea |
| |
Abstract: | The electrodes of a hybrid electrochemical capacitor which utilize the quinone (Q)‐hydroquinone (QH2) couple, a prototypical organic redox system known to provide fast and reversible proton‐coupled electron‐transfer reactions, are deterministically mesostructured via a colloidal templating strategy to provide good ion and electron transport pathways, enabling a high rate performance. Specifically, a conducting polymer, polypyrrole (PPy), is functionalized with a pseudocapacitive material, a Q/QH2‐containing catechol derivative, by noncovalent interactions. The mesostructure of this hybrid material is formed into an ordered 3D porous structure by a polystyrene colloidal crystal template‐assisted electrosynthesis. The catechol derivative is sufficiently bound to the PPy through noncovalent interactions to provide a volumetric capacitance as high as ≈130 F cm?3 and a capacitance retention of ≈75% over 10 000 charging/discharging cycles. When compared with a randomly structured electrode, the deterministically structured electrode exhibits an improved rate performance due to the mesostructure facilitated electron and ion transport. |
| |
Keywords: | catechol energy storage polypyrrole pseudocapacitor quinone |
|
|