对于金属电池,有多少电子进入进化过程? 一个电化学质谱学研究研究
Kingshuk Roy1, Ashutosh Rana1, Joseph N Heil2
1Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
Angewandte Chemie (International ed. in English)
|January 3, 2024
概括
我们开发了一种使用现场电化学质谱的新方法,用于精确测量水化合物在水性电池充电过程中的演变. 这种技术通过了解寄生反应,有助于提高电池效率和寿命.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性电池具有高容量和安全性等优点,但受到进化反应 (HER),腐蚀和树生长的影响.
- 控制HER对于这些电池的长期循环和实际应用至关重要.
- 需要一种精确的定量技术来监测电沉积过程中的实时变化.
研究的目的:
- 在水性电解质中电沉积过程中量化的演变,使用现场电化学质谱 (ECMS).
- 为了确定水性电池中法拉达功率的精确校正系数.
- 为了研究HER和电沉积的形态之间的相关性.
主要方法:
- 现场电化学质谱 (ECMS) 用于监测沉积过程中的演变.
- 来自HER的电荷贡献量化分析与电极沉积.
- 微观分析以与沉积的形态相关联HER.
主要成果:
- ECMS精确量化了的演变,揭示了即使是很小的一小部分 (例如,0.3%在1.5mA/cm2) 也会影响电池性能.
- 确定了HER和多孔形态之间的相关性,表明被困的H2和Zn腐蚀.
- 证明了ECMS能够提供准确的法拉达效率测量的能力.
结论:
- 现场ECMS是一个强大的工具,可以准确地确定水性电池的法拉达效率.
- 了解和抑制HER对于提高AZMBs的长期稳定性和可循环性至关重要.
- 该方法为评估电解质添加剂和电极修改提供了一个平台,以提高AZMB的性能.
更多相关视频
10:01Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
Published on: December 4, 2017
12.2K
09:18Time-resolved ElectroSpray Ionization Hydrogen-deuterium Exchange Mass Spectrometry for Studying Protein Structure and Dynamics
Published on: April 17, 2017
9.9K
相关概念视频
Standard Electrode Potentials
43.9K
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...
43.9K
Calculating Standard Free Energy Changes
21.3K
The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
21.3K
Electrospray Ionization (ESI) Mass Spectrometry
851
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
851
Chemical Ionization (CI) Mass Spectrometry
751
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
751
Electrogravimetric Analysis: Overview
231
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...
231
