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Reversible Intercalation of Al‐Ions in Poly(3,4‐Ethylenedioxythiophene):Poly(4‐Styrenesulfonate) Electrode for Aqueous Electrochemical Capacitors with High Energy Density
Author(s) -
Ai Yuanfei,
Zhang Xiaowei,
Li Renjie,
Lan Yingying,
Zhao Yu,
Ling Hao,
Zhang Fan,
Zhi Chunyi,
Bai Xuedong,
Wang Wenlong
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202001036
Subject(s) - materials science , pedot:pss , poly(3,4 ethylenedioxythiophene) , electrochemistry , intercalation (chemistry) , electrolyte , electrode , aqueous solution , cyclic voltammetry , inorganic chemistry , chemical engineering , nanotechnology , chemistry , layer (electronics) , engineering
Due to the high capacity of the three‐electron redox mechanism, Al‐ions‐based energy‐storage devices have the potential to provide a viable solution to meet the growing demand for powering electronic products. However, discovering suitable electrode materials for reversible insertion of Al ions remains a difficult task. Herein, it is reported that a classical conductive polymeric material poly(3,4‐ethylenedioxythiophene):poly(4‐styrenesulfonate) (PEDOT:PSS) can perform the reversible Al‐ions intercalation for aqueous electrochemical capacitors. The as‐prepared PEDOT:PSS film on a carbon cloth composite electrode exhibits a large magnitude of faradaic currents and sharp redox peaks in cyclic voltammetry (CV) curves in aluminum sulfate electrolyte, and delivers a high capacitance of 269 F g −1 (78 mAh g −1 ). Diffusion‐controlled Al‐ions intercalation/deintercalation as the charge‐storage mechanism is demonstrated here, which is not observed in other ions‐based electrolytes (H + , Mg 2+ , Li + , Na + ). An asymmetric electrochemical capacitor based on Al ions, composed of such an electrode and activated carbon electrode is assembled and displays a high energy density of 41.6 Wh kg −1 at a power density of 0.24 kW kg −1 , demonstrating a promising aqueous electrochemical capacitor with an advanced energy density via polyvalent ions intercalation.