Ag-modified Fe2O3 nanoparticles on a carbon cloth as an anode material for high-performance supercapacitors. (8th January 2020)

• Record Type: Journal Article
• Authors: Guan, Yuzhu; Ji, Peiyuan; Wan, Jing; Zhang, Dazhi; Wang, Zhao; Tian, Hao; Hu, Chenguo; Hu, Baoshan; Tang, Qing; Xi, Yi
• Is Part Of: Nanotechnology. Volume 31:Number 12(2020)
• Publication Date: 2020-01-08
• Subjects: Ag@ Fe2O3 -- modified -- flexible -- supercapacitors; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab5a29
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: By exploiting the storage performance of supercapacitors, iron has the potential to be used as a new anode material. However, this potential is limited by unsatisfactory electrical conductivity and poor cycling stability which impact the energy and power density. Consequently a foundation for improving the electrical conductivity and cycling stability of iron materials to obtain good storage performance is needed. In this work, Ag-modified Fe2 O3 nanoparticles on carbon cloth were synthesized as an anode material for supercapacitors. The specific capacitance of the composite material reaches 10.39 F cm −2 (2734.2 F g −1 ) at a current density of 1 mA cm −2 and remains at 83% of this value after 12 000 cycles. The energy density is 379.8 Wh kg −1 at a power density of 131.6 W kg −1 and remains at 123.9 Wh kg −1 at a power density of 2631.6 W kg −1 . The electrical conductivity and interfacial effect created between Ag@Fe2 O3 is confirmed with density functional theory calculations. The packaged asymmetric supercapacitor devices have flexibility and can light ten LEDs for 2 min 30 s, with an energy density of 60.3 Wh kg −1 that can be reached at a power density of 1063.8 W kg −1 and remain at 16 Wh kg −1 even at a power density of 4255.3 W kg −1 .