A binary composite La(OH)3@Ni(OH)2 nanomaterial on carboxyl graphene for an efficient hybrid supercapacitor electrode

Dianyuan Zheng; Chengxiang Sun; Rongbin Yao; Jinli Li; Yuhang Zheng; Jianhong Zhu; Cheng Liu

doi:10.1039/d3ra03151a

A binary composite La(OH)₃@Ni(OH)₂ nanomaterial on carboxyl graphene for an efficient hybrid supercapacitor electrode

RSC Adv. 2023 Jul 19;13(31):21643-21654. doi: 10.1039/d3ra03151a. eCollection 2023 Jul 12.

Authors

Dianyuan Zheng^{1

2}, Chengxiang Sun^{1

3}, Rongbin Yao¹, Jinli Li¹, Yuhang Zheng⁴, Jianhong Zhu³, Cheng Liu⁵

Affiliations

¹ Institute for Clean Energy & Advanced Materials, Lianyungang Normal College Lianyungang 222006 China.
² State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, Nanjing University Nanjing 210093 China.
³ College of Energy and Electrical Engineering, Hohai University Nanjing 210098 China chengxsun@hhu.edu.cn.
⁴ State Grid Jiangsu Electric Power Engineering Consulting Co., Ltd Nanjing Jiangsu 210008 China.
⁵ College of Electrical Engineering, Zhejiang University Hangzhou 310027 China.

Abstract

In this work, we present a binary composite of La(OH)₃@Ni(OH)₂ on carboxyl graphene (La@Ni/CG) as an electrode material. The layered La@Ni/CG double hydroxides (LDHs) were synthesized by a simple electrodeposition method in which La(OH)₃ nanoparticles were first adsorbed onto carboxyl graphene and then coated with Ni(OH)₂, with different particle shapes due to the large pH change near the cathodic region. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) were used to characterise the as-prepared La@Ni/CG composite. These results showed that the La@Ni/CG composite exhibited improved electrochemical properties, including large specific capacitance (1334.7 F g^-1 at 1.4 A g^-1) and capacity retention of 90.6% even after 3000 cycles, and excellent rate capability. The improved electrochemical performance of the composite can be attributed to the synergistic effect of surface adsorption and conductive pathways provided by the multiple active species (Ni, La and C) in the La@Ni/CG composite. The results presented in this work provide advances in the efficient design of nanomaterial based electrochemical energy storage devices.