控制合成类似花朵的层级的尼科层双氧化物与金属有机框架衍生的Co@C集成,用于超级电容器
Junzhuo Yuan1, Yingxin Li1, Guoge Lu1
1School of Materials and Physics, China University of Mining & Technology, Xuzhou 221116, P. R. China.
ACS applied materials & interfaces
|July 24, 2023
概括
在碳骨架上的一种新的花样层次的-层双 (NiCo-LDH) 纳米结构显著提高了超级电容器的性能. 这种MOF衍生材料为先进的储能应用提供了增强的稳定性和能量密度.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术 纳米技术
背景情况:
- 层状双氧化物 (LDH) 具有独特的结构,非常适合超级电容器,但其速度和循环性能不佳.
- 金属有机框架 (MOFs) 为创建具有改进材料特性的先进纳米结构提供了一条途径.
- 开发高性能电极材料对于能源存储技术的进步至关重要.
研究的目的:
- 用MOF前体为增强的超级电容应用设计一种类似花朵的层次化的NiCo-LDH@C纳米结构.
- 研究新型NiCo-LDH@C复合材料的结构和电化学特性.
- 为了证明MOF衍生的LDHs作为超级电容器的优质电极材料的潜力.
主要方法:
- 使用ZIF-67片作为前体进行了水热反应和化.
- 一个类似花朵的层次的NiCo-LDH@C纳米结构是用在碳骨架上的NiCo-LDH片合成的.
- 电化学性能使用循环电压计,静电电荷放电和电化学阻抗光谱学进行了评估.
主要成果:
- NiCo-LDH@C电极在1Ag-1下表现出高特异电容2210.6Fg-1的高特异电容.
- 在10 A g-1的高电流密度下,实现了88.8%的优异容量保留.
- 使用NiCo-LDH@C//RGO的非对称超级电容器 (ASC) 显示出高能量密度为45.02 W h kg -1.
结论:
- 层次化的NiCo-LDH@C纳米结构有效地克服了传统LDH的局限性,提供了卓越的电化学性能.
- 复合结构提供了增强的稳定性,较大的特定表面积和合作效应,从而改善了循环和速率的能力.
- 这项研究提出了开发先进的MOF衍生LDH电极材料用于高性能超级电容器的有希望的战略.
相关概念视频
02:37Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
01:41The Supercomplexes in the Crista Membrane
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
01:23Properties of Organometallic Compounds
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.