Synthesis of reduced graphene oxide supported nickel-cobalt-layered double hydroxide nanosheets for supercapacitors

Liuyang Zhang; Pengfei Cai; Zhihao Wei; Tao Liu; Jiaguo Yu; Ahmed A Al-Ghamdi; S Wageh

doi:10.1016/j.jcis.2020.11.056

Synthesis of reduced graphene oxide supported nickel-cobalt-layered double hydroxide nanosheets for supercapacitors

J Colloid Interface Sci. 2021 Apr 15:588:637-645. doi: 10.1016/j.jcis.2020.11.056. Epub 2020 Nov 19.

Authors

Liuyang Zhang¹, Pengfei Cai², Zhihao Wei², Tao Liu³, Jiaguo Yu⁴, Ahmed A Al-Ghamdi⁵, S Wageh⁶

Affiliations

¹ Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, PR China; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China.
² State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China.
³ Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, PR China; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China. Electronic address: liutao411@whut.edu.cn.
⁴ Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, PR China; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China. Electronic address: yujiaguo93@whut.edu.cn.
⁵ Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
⁶ Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia. Electronic address: wswelm@kau.edu.sa.

PMID: 33267956
DOI: 10.1016/j.jcis.2020.11.056

Abstract

Supercapacitors are deemed as reliable power sources for portable devices and electric vehicles. Electrode materials with high energy and power densities are greatly needed. Herein, we designed reduced-graphene-oxide supported nickel-cobalt layered double hydroxide nanosheets (NiCo-LDH/rGO) as electrode materials. The introduction of graphene could largely enhance the conductivity, and the supported NiCo-LDH could effectively prevent graphene from self-aggregation. Thanks to the synergistic effect of conductive graphene and electro-active LDH, the nanocomposites delivered a capacitance of 1675 F g^-1 at 1 A g^-1 and decent rate performance (capacitance retention of 83.8% at 10 A g^-1); while NiCo-LDH could only exhibited a capacitance of 920 F g^-1 at 1 A g^-1 and 81.5% of the capacitance remained at 10 A g^-1. The asymmetric supercapacitors assembled with NiCo-LDH/rGO and activated carbon (AC) delivered high energy density and power density, up to 49.9 Wh kg^-1 and 3747.9 W kg^-1, respectively. The appealing electrochemical performance indicates its huge application potential in supercapacitors.

Keywords: Asymmetric supercapacitor; Coprecipitation; NiCo-LDH nanosheets; Pseudocapacitors.