基尔肯德尔效应的正电荷空心Co纳米通过电子集水器稳定性水解离的性水
Tao Zhang1, Lifeng Hang2, Qingyi Liu1
1School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
Advanced materials (Deerfield Beach, Fla.)
|July 18, 2024
概括
这项研究制造了带正电荷的空心 (Co) 纳米,用于性演化反应 (HER). 这些催化剂增强了水分离和质子转移,在低超电位下实现了高效的生产.
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
- 催化剂是一种催化剂.
背景情况:
- (Co) 具有理论上的演化反应 (HER) 潜力,但在性介质中缺少水分离.
- 为性HER开发高效的电催化剂对于清洁能源技术至关重要.
研究的目的:
- 使用Kirkendall效应合成带正电荷的空心金属Co (PHCo) 纳米.
- 研究PHCo对性HER的增强催化活性.
- 阐明改善水分离和吸附/脱附的机制.
主要方法:
- 基肯德尔效应用于制造由MoO2和碳稳定的PHCo纳米.
- 电化学测量以评估性HER性能.
- 操作拉曼光谱和第一原理计算来研究反应机制.
主要成果:
- 与零价值Co相比,PHCo纳米显示出明显加快的水解离.
- 确定速度的步骤从沃尔默流程转移到海洛夫斯基流程.
- 对于性HER,在10mA cm−2时达到59.0mV的低超电位.
- PHCo的向上移动的d波段中心优化了H*吸附/脱吸.
结论:
- 基肯德尔效应为合成PHCo纳米提供了一条新的途径.
- 调整Co催化剂的电荷状态可以提高水分离和HER的性能.
- 这些发现提供了对高效性HER的催化剂设计的见解.
更多相关视频
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
3.6K
13:51Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
Published on: November 10, 2017
15.3K
相关概念视频
Aqueous Solutions and Heats of Hydration
14.6K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.6K
Coagulation
280
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
280
Ions as Acids and Bases
23.7K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
23.7K
Solubility Equilibria: Ionic Product of Water
980
Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
The ionic product of water varies with temperature, and its value is 1.0 x 10−14 at standard experimental conditions. Per Le...
The ionic product of water varies with temperature, and its value is 1.0 x 10−14 at standard experimental conditions. Per Le...
980
Intermolecular Forces
58.1K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.1K
Titration of Polyprotic Base with a Strong Acid
787
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
787
