稀土元素在Rh集群中诱导电子工程,以实现高效的性进化反应
Xin-Yi Zhang1, Ben-Jian Xin2, Zhi-Xiong Huang2
1Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, PR China.
Journal of colloid and interface science
|April 11, 2024
概括
稀土金属 (RE) 增强进化反应 (HER) 催化剂. Sm-Rh@NSPC显示出出色的HER性能和稳定性,归因于Sm-Rh电子协同作用,为高效的电催化剂开发提供了新的途径.
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
- 纳米技术 纳米技术
背景情况:
- 稀土金属 (RE) 具有独特的电子和晶体结构,有利于催化.
- 进化反应 (HER) 对清洁能源技术至关重要.
- 开发高效和稳定的电催化剂对于HER仍然是一个重大挑战.
研究的目的:
- 为了合成新的RE-合Rh@NSPC (N,S共合多孔碳纳米板) 纳米催化剂.
- 调查RE兴奋剂对基于Rh的催化剂的HER性能的影响.
- 探索RE元素和Rh之间的协同电子相互作用,以增强电催化.
主要方法:
- 一种简单,快速,无溶剂的焦热热解法用于催化剂合成.
- 稀土金属 (Sm,Nd,Pr,Ho) 被添加到Rh@NSPC中,其纳米粒子大小小小于2nm.
- 电催化HER性能在1.0MKOH中进行了评估,包括超电位和Tafel斜率测量.
主要成果:
- 优化的Sm-Rh@NSPC催化剂表现出了特殊的HER性能.
- Sm和Rh集群之间的协同电子相互作用增强了Rh上的电子云密度.
- 催化剂在10 mA cm−2时实现了18.1 mV的超电位,Tafel斜率为15.2 mV dec−1.
- Sm-Rh@NSPC催化剂在10 mA cm-2.2下表现出稳定的运行超过100小时.
结论:
- RE 兴奋剂,特别是 Sm,显著增强了 HER 催化活性和 Rh@NSPC 的稳定性.
- 性能提升归因于由于Sm-Rh电子协同作用而改善的H+吸附和H2脱附动力学.
- 这项研究提出了一种新的方法来合成RE增强的纳米催化剂,并为开发先进的电催化剂提供了洞察力.
相关概念视频
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
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...
3.3K
Properties of Transition Metals
25.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
25.8K
Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
14.2K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
14.2K
Reduction of Alkenes: Catalytic Hydrogenation
12.0K
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...
12.0K
Radical Anti-Markovnikov Addition to Alkenes: Overview
3.4K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.4K
Noble Gases
17.5K
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
17.5K


