Nickel-Cobalt Layered Double Hydroxide Nanosheet-Decorated 3D Interconnected Porous Ni/SiC Skeleton for Supercapacitor

Han-Wei Chang; Chia-Hsiang Lee; Shih-Hao Yang; Kuo-Chuang Chiu; Tzu-Yu Liu; Yu-Chen Tsai

doi:10.3390/molecules29235664

Nickel-Cobalt Layered Double Hydroxide Nanosheet-Decorated 3D Interconnected Porous Ni/SiC Skeleton for Supercapacitor

Molecules. 2024 Nov 29;29(23):5664. doi: 10.3390/molecules29235664.

Authors

Han-Wei Chang^{1

2}, Chia-Hsiang Lee¹, Shih-Hao Yang³, Kuo-Chuang Chiu⁴, Tzu-Yu Liu⁴, Yu-Chen Tsai³

Affiliations

¹ Department of Chemical Engineering, National United University, Miaoli 360302, Taiwan.
² Pesticide Analysis Center, National United University, Miaoli 360302, Taiwan.
³ Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan.
⁴ Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 310401, Taiwan.

Abstract

In this study, a three-dimensional (3D) interconnected porous Ni/SiC skeleton (3D Ni/SiC) was synthesized by binder-free hydrogen bubble template-assisted electrodeposition in an electrolyte containing Ni²⁺ ions and SiC nanopowders. This 3D Ni/SiC skeleton served as a substrate for directly synthesizing nickel-cobalt layered double hydroxide (LDH) nanosheets via electrodeposition, allowing the formation of a nickel-cobalt LDH nanosheet-decorated 3D Ni/SiC skeleton (NiCo@3D Ni/SiC). The multiscale hierarchical structure of NiCo@3D Ni/SiC was attributed to the synergistic interaction between the pseudocapacitor (3D Ni skeleton and Ni-Co LDH) and electrochemical double-layer capacitor (SiC nanopowders). It provided a large specific surface area to expose numerous active Ni and Co sites for Faradaic redox reactions, resulting in an enhanced pseudocapacitance. The as-fabricated NiCo@3D Ni/SiC structure demonstrated excellent rate capability with a high areal capacitance of 1565 mF cm^-2 at a current density of 1 mA cm^-2. Additionally, symmetrical supercapacitor devices based on this structure successfully powered commercial light-emitting diodes, indicating the potential of as-fabricated NiCo@3D Ni/SiC in practical energy storage applications.

Keywords: 3D Ni/SiC skeleton; EDLC; nickel–cobalt layered double hydroxide; pseudocapacitance; supercapacitor.

Grants and funding

This study acknowledges financial support from the National Science and Technology Council, National United University, and Industrial Technology Research Institute, Taiwan (NSTC 112-2221-E-239-001-MY3, NSTC 112-2221-E-005-007-MY3 and SE113002).