Dandelion-Like CuCo2O4@ NiMn LDH Core/Shell Nanoflowers for Excellent Battery-Type Supercapacitor

Wenhua Zhao; Xingliang Xu; Niandu Wu; Xiaodie Zhao; Jiangfeng Gong

doi:10.3390/nano13040730

Dandelion-Like CuCo₂O₄@ NiMn LDH Core/Shell Nanoflowers for Excellent Battery-Type Supercapacitor

Nanomaterials (Basel). 2023 Feb 14;13(4):730. doi: 10.3390/nano13040730.

Authors

Wenhua Zhao^{1

2}, Xingliang Xu¹, Niandu Wu², Xiaodie Zhao¹, Jiangfeng Gong³

Affiliations

¹ Department of Applied Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China.
² National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
³ College of Science, Hohai University, Nanjing 211199, China.

Abstract

Dandelion-like CuCo₂O₄ nanoflowers (CCO NFs) with ultrathin NiMn layered double hydroxide (LDH) shells were fabricated via a two-step hydrothermal method. The prepared CuCo₂O₄@NiMn LDH core/shell nanoflowers (CCO@NM LDH NFs) possessed a high specific surface area (~181 m²·g^-1) with an average pore size of ~256 nm. Herein, the CCO@NM LDH NFs exhibited the typical battery-type electrode material with a specific capacity of 2156.53 F·g^-1 at a current density of 1 A·g^-1. With the increase in current density, the rate capability retention was 68.3% at a current density of 10 A·g^-1. In particular, the 94.6% capacity of CCO@NM LDH NFs remains after 2500 cycles at 5 A·g^-1. An asymmetric supercapacitor (ASC) with CCO@NM LDH NFs//activated carbon (AC) demonstrates a remarkable capacitance of 303.11 F·g^-1 at 1 A·g^-1 with excellent cycling stability. The coupling and synergistic effects of multi-valence transition metals provide a convenient channel for the electrochemical process, which is beneficial to spread widely within the realm of electrochemical energy storage.

Keywords: CuCo2O4@NiMn LDH nanoflowers; battery-type; core/shell; supercapacitors; synergistic effect.

Abstract

Grants and funding