High performing all-solid electrochemical capacitor using chitosan/poly(acrylamide-co-diallyldimethylammonium chloride) as anion conducting membranes. (20th June 2018)

• Record Type: Journal Article
• Authors: Ao, Bei; Wei, Yanan; Wang, Min; Cai, Yixiao; Lian, Keryn; Qiao, Jinli
• Is Part Of: Electrochimica acta. Volume 276(2018)
• Page Start: 319
• Page End: 324
• Publication Date: 2018-06-20
• Subjects: Anion-exchange membrane -- Double cross-linking -- Alkaline and oxidative stability -- Specific capacitance -- All-solid electrochemical capacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.04.133
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The aim of the present work is to demonstrate a novel alkaline anion-exchange membrane composed of chitosan (CS) and poly (acrylamid-co-diallyldimethylammonium chloride) (PAADDA) for electrical double layer capacitors (EDLCs). The CS-PAADDA-OH - membranes were prepared through a combined thermal and chemical cross-linking strategy and their physical-chemical properties were investigated. As a notable example, when the mass fraction of PAADDA was about 33%, the CS-PAADDA-OH - membrane exhibits excellent OH − conductivity, reaching high as 0.0151 S cm −1, while its water uptake is only about 32.23%. Such membrane also showed optimal mechanical property and excellent thermal stability, due to the compact and dense network. Moreover, all the testing membranes showed high oxidative stability in 30% H2 O2 solution, and a robust alkaline stability in 8 M KOH at 60 °C for 320 h of evaluation. The resultant EDLC device demonstrated a voltage window at about 1.2 V, sustaining a cycle-life over 2000 cycles. Even when the scan rate is up to 5 V s −1, the device still maintained excellent rate capability. This study provides feasibility of transforming bulky liquid devices to safer and solid thin devices.