单原子催化剂在离子纳米晶体表面或内部的位置选择性固定,使用协调化学
Kenichi Endo1,2, Masaki Saruyama1, Toshiharu Teranishi3
1Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
Nature communications
|July 15, 2023
概括
研究人员精确控制了单原子催化剂在支材料上的放置. 表面吸附的原子在光催化进化过程中增强了稳定性和活性,提供了新的设计策略.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术纳米技术
背景情况:
- 单原子催化剂 (SAC) 根据与支材料的相互作用表现出可调节的特性.
- 单个原子的位置 (表面与内部) 显著影响催化性能.
- 在支上或支内的单个原子的选择性固定仍然是一个挑战.
研究的目的:
- 开发一种用于单原子催化剂的选择性合成方法.
- 调查单原子位置对催化活性和稳定性的影响.
- 提供SACs精确设计的战略.
主要方法:
- 使用特定的金属复合体前体 (cis-[PtCl2(SO(CH3)2)2]和[PtCl4]2-) 和溶剂条件 (近离子与前离子).
- 采用氨酸处理来替代阴离子,以实现内部原子的放置.
- 描述催化剂结构和评估光催化进化中的性能.
主要成果:
- 在一个近极溶剂中的cis-[PtCl2(SO(CH3)2) 2前体,选择性地将单个 (Pt) 原子放置在CdSe纳米板块的表面上.
- 一种基溶剂中的[PtCl4]2-前体,然后进行氨基处理,导致60%的单个Pt原子通过阴离子替代被内部纳入.
- 与内部被替代的原子相比,表面被吸收的单个Pt原子在光催化进化中的稳定性和活性更高.
结论:
- 选择前体,溶剂和加工程序使单个原子的故意和选择性放置成为可能.
- 表面吸收的单个原子最大化了催化活性,突出显示了受控合成的重要性.
- 这项研究为高活性单原子催化剂的精确合成和设计提供了可行的策略.
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