ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Fabrication of 2D layered structure of rGO@Bi₂O₂CO₃@NiCo-LDHs composite electrode for aqueous asymmetric supercapacitor

Zhi-Guang Yang, Shu-Jing Liu, Jing-Jing Zheng, Luo-Xi Wang, Li-Na Xiao, Zhen-Dong Li, Xiao-Bin Zhang, and Zhi-Qiang Hou

School of Chemistry and Chemical Engineering, Zhou Kou Normal University, Zhoukou, People’s Republic of China

E-mail: hou_zq@sina.cn

Received: 6 June 2021  Accepted: 3 September 2021

Abstract:

Two-dimensional layered structure of rGO@Bi₂O₂CO₃@NiCo-LDHs as positive material of supercapacitor is fabricated using the simple hydrothermal reaction, freeze-drying technology, and heat treatment process. The corresponding electrode exhibits a maximum specific capacity of 1147 F/g at 0.5 A/g and 82.2% capacity retention after 1000 times charging and discharging at 10 A/g. Additionally, negative material of rGO film is also prepared, which has a higher specific capacity of 354 F/g than that of other carbon materials. To obtain a high performance of supercapacitor device, an asymmetric supercapacitor of rGO//rGO@Bi₂O₂CO₃@NiCo-LDHs is assembled based on rGO@Bi₂O₂CO₃@NiCo-LDHs, rGO film, and 2 M KOH electrolyte. The testing data show that the maximum specific capacitance and energy density of asymmetric supercapacitor are 85 F/g and 23.14 Wh/kg, respectively. Simultaneously, it also shows the good electrochemical stability, remaining 80% capacity after 3000 cycles. This means that rGO@Bi₂O₂CO₃@NiCo-LDHs could be regarded as a promising electrode material for energy storage devices.

Keywords: Bi2O2CO3; NiCo-LDHs; Asymmetric supercapacitor; Electrochemical performances

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01861-y

Chemical Papers 76 (1) 277–286 (2022)