用于高性能电池型超级电容器的类蒲公英状CuCoO@NiMn LDH核壳纳米花

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

作者信息

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

机构信息

Department of Applied Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China.

National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.

出版信息

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

DOI:10.3390/nano13040730

PMID:36839098

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9967973/

Abstract

Dandelion-like CuCoO nanoflowers (CCO NFs) with ultrathin NiMn layered double hydroxide (LDH) shells were fabricated via a two-step hydrothermal method. The prepared CuCoO@NiMn LDH core/shell nanoflowers (CCO@NM LDH NFs) possessed a high specific surface area (~181 m·g) 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 at a current density of 1 A·g. With the increase in current density, the rate capability retention was 68.3% at a current density of 10 A·g. In particular, the 94.6% capacity of CCO@NM LDH NFs remains after 2500 cycles at 5 A·g. An asymmetric supercapacitor (ASC) with CCO@NM LDH NFs//activated carbon (AC) demonstrates a remarkable capacitance of 303.11 F·g at 1 A·g 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.

摘要

通过两步水热法制备了具有超薄镍锰层状双氢氧化物（LDH）壳的类蒲公英状CuCoO纳米花（CCO NFs）。制备的CuCoO@NiMn LDH核壳纳米花（CCO@NM LDH NFs）具有高比表面积（约181 m²·g），平均孔径约为256 nm。在此，CCO@NM LDH NFs表现出典型的电池型电极材料，在1 A·g的电流密度下比容量为2156.53 F·g。随着电流密度的增加，在10 A·g的电流密度下倍率性能保持率为68.3%。特别是，CCO@NM LDH NFs在5 A·g下经过2500次循环后仍保留94.6%的容量。具有CCO@NM LDH NFs//活性炭（AC）的不对称超级电容器（ASC）在1 A·g下表现出303.11 F·g的显著电容，具有优异的循环稳定性。多价过渡金属的耦合和协同效应为电化学过程提供了便利通道，有利于在电化学储能领域广泛应用。