Facile synthesis of Pr-doped Co3O4 nanoflakes on the nickel-foam for high performance supercapacitors. (20th February 2022)

• Record Type: Journal Article
• Authors: Yang, Dandan; Xu, Mai; Liang, Xian; Wang, Jiayi; Fang, Wenyan; Zhu, Chuangao; Wang, Fengwu
• Is Part Of: Electrochimica acta. Volume 406(2022)
• Publication Date: 2022-02-20
• Subjects: Co3O4 nanoflakes -- Rare earth -- Doped -- Supercapacitor -- Specific capacitance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.139815
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Pr-doped Co3 O4 nanoflakes supported on Ni foam was prepared. The electrode material exhibited a remarkable specific capacitance of 1625 Fg −1 at 2 Ag −1 The capacitance retention maintains 98% after 5000 charge-discharge cycles at 10 Ag −1 The assembled asymmetric supercapacitor device has excellent energy density. Abstract: In recent decades, one of the biggest challenges is finding an electrode materials with high performance for the high supercapacitor having energy density and long cycle life. Meantime, Rare earth has attracted much attention in the energy storage applications for it unique properties. Herein, we synthesized the Pr2 O3 doped Co3 O4 nanoflakes (Pr2 O3 /Co3 O4 ) grown on the nickel foam by simple hydrothermal synthesis and calcination process for supercapacitor applications. The synthesized nanoflakes regarded as unbonded and conductor-free electrode materials have excellent electrochemical performance in supercapacitors. Dramatic improvement in the rate capacity of the Co3 O4 nanoflakes is achieved by doping Pr2 O3 . The as-prepared Pr2 O3 /Co3 O4 electrode presents a remarkable specific capacitance of 640 C g −1 at 2 A g −1 and excellent capacitance retention of 98% after 5000 charge-discharge cycles at 10 A g −1 . Moreover, an asymmetric capacitors assembled (ASC) is composed of the battery-type Pr2 O3 /Co3 O4 electrodes and the capacitance of activated carbon (AC) electrodes, in which the Pr2 O3 /Co3 O4 electrode as a positive and activated carbon (AC) as a negative electrode, showing a maximum energy density of 42.3 Wh kg −1 at power density of 240 W kg −1 and better capacity retention of 88% when maximum current density at 1 A g −1 after 5000 cycles. The remarkable electrochemical performance of the as-fabricated Pr2 O3 /Co3 O4 nanoflakes electrode material indicates the promising prospects in supercapacitors. Graphical abstract: Image, graphical abstract