坚固的Ru-VO2双功能催化剂用于全pH整体水分离
Ziqiang Niu1, Zhankuan Lu1, Zelong Qiao1
1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China.
Advanced materials (Deerfield Beach, Fla.)
|December 4, 2023
概括
一种新的Ru-VO2复合催化剂在所有pH水平上表现出氧化演变反应和演变反应的异常双功能性能,这对于可持续的整体水分裂 (OWS) 至关重要. 这种催化剂的性能明显优于商业RuO2,为高效的气生产提供了有希望的进步.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 开发高效的氧进化反应 (OER) 和进化反应 (HER) 的双功能催化剂对于可持续的整体水分裂 (OWS) 至关重要.
- 在所有pH条件下实现高性能仍然是OWS催化剂的重大挑战.
研究的目的:
- 设计和合成一个强大的双功能催化剂Ru-VO2,用于在酸性,性和中性介质中高效的OWS.
- 为了研究Ru纳米粒子 (NP) 和Ru-doped VO2之间的协同效应,以增强催化活性.
- 阐明OER在Ru-VO2催化剂上的反应机制.
主要方法:
- 一种含有Ru-doped VO2和Ru NP的复合Ru-VO2材料的合成.
- 在各种pH溶液中OER和HER性能的电化学表征.
- 现场光谱和质谱技术 (拉曼,DEMS) 用于研究反应机制.
- 密度函数理论 (DFT) 计算,以了解协同效应和反应途径.
主要成果:
- 与商业RuO2相比,Ru-VO2复合物在1.53V的酸性 (65x),性 (36x) 和PBS (235x) 溶液中表现出明显更高的OER质量活动.
- 一个"Ru-VO2Ruby Ru-VO2"电解仪在10mA cm-2下实现了1.515V的低电压,用于酸性水分离,并证明了125小时的稳定运行.
- 现场研究和DFT计算证实了Ru NP和Ru-doped VO2之间的协同效应,通过破坏键网络来增强OER活动.
结论:
- 合成的Ru-VO2复合物是一种高效的pH-通用双功能催化剂,用于整体的水分裂.
- Ru NPs和Ru-doped VO2之间的协同相互作用是增强催化性能的关键.
- 这项研究为设计用于高效和可持续生产的先进催化剂提供了宝贵的见解.
相关概念视频
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Redox Reactions
55.7K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
55.7K
Reduction of Alkenes: Catalytic Hydrogenation
12.1K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.1K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.6K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.6K
Voltaic/Galvanic Cells
57.3K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.3K


