A Freeze-and-Thaw-Assisted Approach to Fabricate MXene/ZIF-8 Composites for High-Performance Supercapacitors and Methylene Blue Adsorption. Issue 11 (31st July 2020)

• Record Type: Journal Article
• Authors: Li, Yue; Kamdem, Pascal; Jin, Xiao-Juan
• Is Part Of: Journal of the Electrochemical Society. Volume 167:Issue 11(2020)
• Publication Date: 2020-07-31
• Subjects: MXene -- asymmetric supercapacitor -- adsorption -- MXene/ZIF-8; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/aba934
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Herein, an effective strategy was carried out to exfoliate multilayer-MXene via the gentle water freezing-and-thawing method. Following that, we designed and fabricated novel microporous Zeolitic imidazolate frameworks-8 (ZIF-8) type metal-organic frameworks hybrids incorporated with MXene by a facile layer-by-layer deposition approach which is highly desirable to overcome the severe restacking problem of MXene layers. As a supercapacitor electrode, the MXene/ZIF-8-4 composite achieved a high capacitance of 1279.5 F g −1 at 0.5 A g −1 . Moreover, the capacitance retention of MXene/ZIF-8-4 composite could maintain 90.88% after 10000 cycles at 5 A g −1 . Furthermore, asymmetrical supercapacitor has been fabricated using MXene/ZIF-8 composite as positive electrode and exhibit exceptional electrochemical performance. This device exhibits a large specific capacitance of 354.7 F g −1 at 0.5 A g −1, and energy density of 57.84 Wh kg −1 at a power density of 0.628 kW kg −1 . In addition, MXene/ZIF-8 composites are transformed into different a loosely organized porous aerogel using freeze-drying process. As a result, the 3D porous MXene/ZIF-8 aerogels exhibit a high adsorption capacity of 459 mg g −1 to remove Methylene blue (MB).