塔菲尔斜率图作为分析电催化反应的工具
Onno van der Heijden1, Sunghak Park1, Rafaël E Vos1
1Leiden Institute of Chemistry, Leiden University, 2333 CC Leiden, The Netherlands.
概括
塔菲尔斜率图有效地分离了电催化中的动力和非动力因素. 这种方法提高了在传统的Tafel图表不清楚时,在各种反应中比较动力数据的可靠性.
科学领域:
- 电化学 电化学 电化学
- 电触媒溶解是一种电触媒.
- 表面科学是一门学科.
背景情况:
- 面板斜率分析对于理解电催化反应动力学至关重要.
- 区分动力和非动力贡献 (例如,大众运输) 是一个挑战.
- 一个恒定的Tafel斜率区域意味着动力意义.
研究的目的:
- 评估Tafel斜率图的实用性,以分离动力和非动力贡献.
- 为了比较从线性扫描电压测量,时频测量和阻抗光谱学获得的Tafel斜率值.
- 评估Tafel斜率图在各种电催化反应中的适用性.
主要方法:
- 线性扫描电压测量 (LSV) 线性扫描电压测量
- 时间度测量 (CA)
- 电化学阻抗光谱学 (EIS) 电化学阻抗光谱学
- 图表斜率图分析图表分析图表
主要成果:
- 在高质量运输条件下,使用不同的技术在NiFeOOH上观察到类似的氧化演化反应 (OER) 的Tafel斜率值.
- 对于性进化反应 (HER) 和二氧化碳减排反应 (CO2RR) 没有找到水平的Tafel斜坡区域.
- 在1M HClO4中成功地获得了Pt上的HER的30mV/dec的预期Tafel斜率.
结论:
- 塔菲尔斜率图是分析电催化动力学的宝贵工具,特别是当传统方法含糊不清时.
- 广泛采用Tafel斜率图可以提高各种电催化反应的动力数据的可比性.
- 该技术的有效性因特定反应和条件而异,强调需要仔细应用.
相关概念视频
Electrogravimetric Analysis: Overview
225
Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
To test the completeness of the...
225
Ladder Diagrams: Redox Equilibria
457
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
457
Voltammograms: Overview
203
Voltammograms are current plots as a function of applied potential, offering insights into electrochemical systems. The shape of a voltammogram depends on how the current is measured and whether convection (heat transfer by fluid movement) is present or absent.
Shapes of Voltammograms
Shapes of Voltammograms
203
Interfacial Electrochemical Methods: Overview
240
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...
240
Voltammetry: Factors Affecting Measurements
156
A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
156
Voltammetric Techniques: Cyclic Voltammetry
453
Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
453


