Grotthuss Proton‐Conductive Covalent Organic Frameworks for Efficient Proton Pseudocapacitors

Autor:	Liqin Hao, Peng Cheng, Yao Chen, Zhenjie Zhang, Yi Yang, Penghui Zhang
Rok vydání:	2021
Předmět:	Supercapacitor Materials science General Medicine General Chemistry Carbon nanotube Capacitance Catalysis Pseudocapacitance law.invention Electron transfer Chemical engineering law Pseudocapacitor Grotthuss mechanism Covalent organic framework
Zdroj:	Angewandte Chemie International Edition. 60:21838-21845
ISSN:	1521-3773 1433-7851
Popis:	Herein, we describe the synthesis of two highly crystalline, robust, hydrophilic covalent organic frameworks (COFs) that display intrinsic proton conduction by the Grotthuss mechanism. The enriched redox-active azo groups in the COFs can undergo a proton-coupled electron transfer reaction for energy storage, making the COFs ideal candidates for pseudocapacitance electrode materials. After in situ hybridization with carbon nanotubes, the composite exhibited a high three-electrode specific capacitance of 440 F g-1 at the current density of 0.5 A g-1 , among the highest for COF-based supercapacitors, and can retain 90 % capacitance even after 10 000 charge-discharge cycles. This is the first example using Grotthuss proton-conductive organic materials to create pseudocapacitors that exhibited both high power density and energy density. The assembled asymmetric two-electrode supercapacitor showed a maximum energy density of 71 Wh kg-1 with a maximum power density of 42 kW kg-1 , surpassing that of all reported COF-based systems.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e5d526f31641ce3472423d85e7f35b1 https://doi.org/10.1002/anie.202105725 Zobrazit plný text záznamu Plný text