非直接结合的单原子对向H2/CO电氧化
Tongtong Yang1, Heng Liu2, Hengjie Liu3
1State Key Laboratory of Electroanalytic Chemistry, Jilin Province Key Laboratory of Low Carbon Chemistry Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China.
孤立的单个原子是不活跃的;相邻的对 (低于4 Å) 是氧化反应的真正活跃点. 这一发现重新定义了用于高效能源转换的双功能催化剂.
科学领域:
- 催化科学是一种催化科学.
- 材料科学是一种材料科学.
- 电化学 电化学 电化学
背景情况:
- 单原子催化剂 (SAC) 提供精确的控制,但它们的合作行为尚未完全理解.
- 像H2和CO氧化等氧化过程对于能量转化至关重要.
研究的目的:
- 为了研究氧化反应的单原子系统中真正的活性点.
- 了解原子邻近性和合作性在催化中的作用.
- 重新定义双功能催化剂的机制.
主要方法:
- 使用石墨烯量子点限制精确调整Rh原子密度.
- 数学建模以将活性对与电化学性能相关联.
- 18O同位素标记和现场同步红外光谱学.
主要成果:
- 完全孤立的单个原子是不活跃的;空间相邻的单个原子对 (原子间距离<4 Å) 是活跃的位点.
- 电化学性能尺度与这些活性对的密度.
- 一个新的反应机制涉及水在Rh对上的双功能解离被确定为速度决定的步骤.
结论:
- 在SAC中的活性位点是合作对,而不是孤立的原子.
- 原子的近距离决定了催化活动,将单原子精度与纳米粒子合作性融合在一起.
- 这重新定义了双功能催化剂,并为设计高效的能量转换系统提供了途径.
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