酸盐电解质成分在膜电极组件内其电解过程中的演变,带有质子交换膜
Dmitry V Konev1,2, Pavel A Zader2, Mikhail A Vorotyntsev2
1Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, Chernogolovka 142432, Russia.
International journal of molecular sciences
|October 28, 2023
概括
酸盐溶液的电化学还原会改变的氧化状态并影响pH值. 最初的酸度会影响最大的pH值,并在氧化还原过程中防止液态的形成.
科学领域:
- 电化学 电化学 电化学
- 化学热力学化学热力学
- 解决方案化学 解决方案化学
背景情况:
- 阴极电流通过酸性水性酸盐溶液改变了原子的平均氧化程度.
- 这种电化学过程涉及物种的质子化/解质子化,化学和氧化还原/电化学转换的复杂相互作用.
- 质子 (H+) 度因离子参与和通过阴离子交换膜的流动而动态变化.
研究的目的:
- 分析不同初始硫酸 (cA0) 和总 (ctot) 度下的阴解质组成变化.
- 为了研究这些变化作为热力学平衡下平均原子氧化度 (x) 的函数.
- 为了确定最佳的初始酸含量,以防止液体的形成,同时最大限度地增加电活性化合物.
主要方法:
- 进行了热力学平衡计算.
- 分析了不同初始酸度 (0.015-0.3M) 和总度 (0.1或1.0M) 的甲醇组合物.
- 该研究的重点是平均氧化状态 (x) 和阴解质成分度之间的关系.
主要成果:
- 在氧化还原能力耗尽期间 (x从5到-1),阴解质的pH值呈现最大值.
- 这个pH最大值的高度和相应的平均氧化状态取决于初始的酸/酸比率.
- 开发了一个预测算法来指导初始酸度的选择.
结论:
- 最初的酸度是控制酸盐溶液电化学行为的关键参数.
- 优化最初的酸含量可以有效地防止液的不良形成.
- 这些发现为最大限度地提高电活性物种在阴解质中的度提供了基础.
相关概念视频
Electrolysis
26.6K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.6K
Potentiometry: Membrane Electrodes
596
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
596
Balancing Redox Equations
52.4K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
52.4K
Radical Substitution: Allylic Bromination
5.1K
In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
5.1K
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
8.2K
Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
8.2K
α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction
3.0K
The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
3.0K


