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相关概念视频

Metal-Ligand Bonds02:51

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Properties of Transition Metals02:58

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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.
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相关实验视频

Updated: Jun 28, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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第二层N剂在孤立的Pt位点调节酸性O2降低通路

Baoxin Ni1,2, Peng Shen2, Guiru Zhang2

  • 1National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Journal of the American Chemical Society
|April 12, 2024
PubMed
概括

--碳单原子催化剂中的补剂精确地控制氧降解反应 (ORR) 路径. 这项研究针对燃料电池至关重要的高效能源转化进行了选择性调整.

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科学领域:

  • 电化学
  • 材料科学
  • 催化剂

背景情况:

  • (Pt) 是酸性氧降解反应 (ORR) 的基准催化剂,对于能量转化至关重要.
  • 由于复杂的协调环境,控制单原子催化剂的ORR路径具有挑战性.

研究的目的:

  • 研究邻近的 (N) 剂如何影响Pt单个原子的电子结构.
  • 在Pt-N-C SAC中证明ORR选择性的调整 (O2-to-H2O与O2-to-H2O2).

主要方法:

  • 碳纳米管合成支持Pt-N-C单原子催化剂.
  • 使用X射线辐射光谱和隔离纳米粒子增强的拉曼光谱.
  • 使用理论建模进行综合分析.

主要成果:

  • 通过改变N dopant协调,在0.3V时实现可调节的O2到H2O2选择性从10%到85%.
  • 氧化和氧化协调有利于4电子ORR路径.
  • 第二层石墨-N引入削弱了*OOH结合,促进了2电子ORR通路.

结论:

  • 当地的化学环境,特别是N dopant协调,对于引导Pt SAC中的ORR选择性至关重要.
  • 通过操纵单原子催化剂的协调球来精确控制电化学性能.