相关实验视频
Updated: Jun 14, 2025

05:03
Precise Electrochemical Sizing of Individual Electro-Inactive Particles
Published on: August 4, 2023
1.2K
在CP2K中的大法典集体方法,用于在恒定电极电位下建模电化学
1Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
Journal of chemical theory and computation
|September 6, 2024
概括
本研究在CP2K中引入了两种新的大法典集体方法,用于模拟电化学接口,实现自然电子数值波动和精确的工作功能控制,用于先进的计算化学.
科学领域:
- 计算化学计算化学
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
背景情况:
- 传统的密度函数理论 (DFT) 在电化学固体-液体界面上与可变电子数作斗争.
- 现有的正统组合方法不能准确地捕捉电化学系统中电子密度和吸附物种的动态性质.
- 模拟电化学接口需要能够处理波动的电子数量和变化的表面条件的方法.
研究的目的:
- 在CP2K软件中实现和呈现两个大法典集体方法.
- 为了克服固定电子数的局限性,DFT用于电化学接口模拟.
- 为了实现更准确和灵活的电化学系统的计算研究.
主要方法:
- 使用隐式溶剂和显式溶解物模型实现大规范自相一致场 (GC-SCF) 方法.
- 整合一个平面的反充电盐模型,用于完全选电极电荷.
- 开发一个GC DFT分子动力学 (DFT-MD) 模拟方案,用于完全明确的溶剂和离子建模.
主要成果:
- GC-SCF方法允许电子数量的自然波动,具有实验电极潜力和对工作功能的精确控制.
- 通过允许电子数量变化,GC DFT-MD 方案可以计算电化学半反应的电子化学潜力.
- 这两种方法都提供了稳定的自相一致的场融合和准确的电子结构,用于指定的工作功能.
结论:
- 在CP2K中开发的大型正典合奏方法超越了正典合奏范式.
- 这些方法为广泛的系统提供了前期的电化学计算.
- 这种实现为研究复杂的电化学现象的研究人员提供了一个强大的工具.
相关概念视频
Standard Electrode Potentials
43.6K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
43.6K
Electrochemistry: Overview
1.6K
Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
1.6K
Chemical Equilibria: Systematic Approach to Equilibrium Calculations
664
Equilibrium calculations for systems involving multiple equilibria are often complex. For example, to calculate the solubility of a sparingly soluble salt in an aqueous solution in the presence of a common ion, one must consider all the equilibria in this solution. Calculations for these systems can be complicated and tedious, so a systematic approach with a series of steps is often helpful. The process is detailed below.
The first step is to identify all the chemical reactions involved, The...
The first step is to identify all the chemical reactions involved, The...
664
Potentiometry: Types of Electrodes
558
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
558
Controlled-Potential Coulometry: Electrolytic Methods
149
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
The chosen potential...
149
Interfacial Electrochemical Methods: Overview
223
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
223

