抑制动态演化的RuO2的过氧化,以实现酸性水电解的双赢活动稳定性
Wenjing Li1, Dingming Chen2, Zhenxin Lou1
1Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Journal of the American Chemical Society
|February 28, 2025
概括
这项研究使用机器学习来了解绿色生产过程中RuO2催化剂如何降解. 它揭示了一种用于制造稳定的催化剂的兴奋剂规则,Na-RuO2的耐用性超过1800小时.
科学领域:
- 材料科学
- 催化剂
- 可再生能源
背景情况:
- 质子交换膜 (PEM) 水电解是绿色的关键,但RuO2催化剂在酸氧演化反应 (a-OER) 中缺乏稳定性.
- 在反应条件下了解RuO2的原子尺度结构变化对于改善催化剂耐用性至关重要.
研究的目的:
- 通过自适应机器学习工作流程阐明RuO2{110}表面的潜在依赖结构演变.
- 确定与催化剂稳定性相关的结构模式,并制定增强耐用性的策略.
主要方法:
- 使用自适应机器学习工作流程分析RuO2的复杂组成和配置空间.
- 模拟了操作条件以观察潜在依赖的状态对状态的全球演变.
- 研究了金属剂工程,以提高催化剂的稳定性.
主要成果:
- 鉴定出一种具有扭曲的RuO5单位的活性状态,但在较高的电位下容易过度演变为惰性RuO4.
- 发现了一个反向的火山式兴奋剂规则:最佳的兴奋剂涉及与Ru-O键显著不同的金属-氧键.
- 预测和实验验证的Na注稳定了RuO2,实现了超过1800小时的稳定a-OER运行.
结论:
- 该研究提供了设计稳定的RuO2基催化剂的理论框架,通过澄清金属剂的作用.
- 在a-OER和PEM电解中,Na-RuO2具有特殊的长期耐用性,为更强大的绿色生产铺平了道路.
相关概念视频
Radical Autoxidation
2.1K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.1K
The Electron Transport Chain
15.9K
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
15.9K
Radical Oxidation of Allylic and Benzylic Alcohols
1.9K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
1.9K
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
5.6K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
5.6K
Oxidation of Phenols to Quinones
2.8K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
2.8K
Redox Titration: Other Oxidizing and Reducing Agents
221
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
221


