原子分散的Ir催化剂在光催化过程中表现出依赖支持的水氧化动力学
Hongna Zhang1, Tianying Liu1, Nicholas Dulock1
1Department of Chemistry, Boston College, Merkert Chemistry Center Chestnut Hill Massachusetts 02467 USA dunwei.wang@bc.edu waegele@bc.edu.
Chemical science
|June 23, 2023
概括
这项研究表明,支材料显著影响异质水氧化催化. 不同的支物会影响孔的再分配,影响催化剂的活性,尤其是在更高的温度下.
科学领域:
- 催化剂是一种催化剂.
- 可再生能源技术可再生能源技术
- 材料科学 材料科学 材料科学
背景情况:
- 水氧化催化对于可再生能源至关重要.
- 反应机制对活性部位的孔密度敏感.
- 之前的研究使用了不同的材料,阻碍了直接比较.
研究的目的:
- 为了比较不同支器 (ITO和CeO2) 上的异质化双核Ir催化剂 (Ir-DHC).
- 为了研究支材料对水氧化活性的影响.
- 了解孔重新分配在催化性能中的作用.
主要方法:
- 使用光敏感剂 (Ru(bpy) 32+) 和电子清除器 (S2O82-) 对悬浮物的脉冲辐射.
- 对比了Ir-DHC在ITO和CeO2上的水氧化活性,在不同温度和光流动下支持.
- 分析了支材料对孔重新分配到活跃地点的影响.
主要成果:
- 在低温 (288-298 K) 时,ITO和CeO2的活动是可比的.
- 在更高的温度 (310-323 K) 上,ITO上的Ir-DHC显示出比CeO2.2上高出~100%的活性.
- 不同的活动被归因于ITO和CeO2.2不同的孔重新分配能力.
结论:
- 支基质的特性对异质催化剂的周转率有重要影响.
- 在更高的温度下,支物对孔的重新分配成为限制因素.
- 这凸显了在设计高效的氧化水催化剂时选择支的重要性.
更多相关视频
10:52Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
12.9K
10:21Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
8.4K
相关概念视频
02:50Catalysis
27.1K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
27.1K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.4K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.4K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.5K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.5K