协调封闭的银-有机高性能电化学脱离离的框架
Dun Wei1, Baixue Ouyang1, Yiyun Cao1
1School of Metallurgy and Environment, Central South University, Changsha, 410083, China.
概括
基于银的金属有机框架 (Ag-MOF) 为电容性脱离离子 (CDI) 提供了增强的化物去除. 这种新的阳极材料提高了电极的稳定性和利用率,提高了CDI性能.
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
- 环境工程 环境工程
背景情况:
- 银 (Ag) 是电容脱离离 (CDI) 的一个有前途的阳极材料,因为它具有很高的理论容量和对离子的选择性 (Cl-).
- 传统的Ag电极由于在转化反应和Ag聚合过程中的体积变化而受到低循环性能的影响.
- 开发稳定且高度分散的基于Ag的电极对于高效的CDI至关重要.
研究的目的:
- 开发一种新的基于Ag的金属有机框架 (Ag-MOF) 用于CDI阳极.
- 为了克服传统的Ag电极的局限性,例如循环稳定性差和聚合.
- 提高在CDI中Ag的活性位点的利用率和界面稳定性.
主要方法:
- 使用有机链接器限制策略和MOF化学构建Ag-MOF.
- 在CDI中去除Cl的电化学性能评估.
- 使用密度函数理论 (DFT) 计算,ex situ XRD,ex situ Raman和XPS进行表征,以阐明捕获机制.
主要成果:
- 在500毫克L-1NaCl溶液中,Ag-MOF在20mAg-1下显示出121.52毫克g-1的高Cl-去除能力.
- 在100个循环后实现了60.54%的高Ag利用率和96.93%的优异容量保持率.
- 在MOF结构内的分子水平上Ag的均分散提高了活性部位的利用率和界面稳定性.
结论:
- 在Ag-MOF中的有机连接器封闭策略有效地解决了CDI的传统Ag电极的局限性.
- 在电容脱离中,Ag-MOF提供了一种高性能转换电极,用于高效和稳定的Cl去除.
- 这种电极设计为开发用于净化水的先进材料提供了宝贵的见解.
更多相关视频
10:27Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
Published on: July 14, 2015
10.1K
07:45Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
10.0K
相关概念视频
Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
Ion Exchange
591
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
591
Ion-Exchange Chromatography
455
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
455
Electrodeposition
630
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
630
Coordination Compounds and Nomenclature
21.3K
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...
21.3K
Extraction: Advanced Methods
446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
