相关实验视频

Updated: Jun 4, 2025

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

确定上方d频段边缘作为PtCo合金上的氨氧化在低温直接氨燃料电池中的活性描述器

Fei Fang^1,2, Qiyang Cheng^1,2, Mengfan Wang²

¹College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215006, China.

|January 3, 2025

概括

研究人员确定了上方的d频段边缘作为直接氨燃料电池 (DAFC) 中氨氧化反应 (AOR) 电催化剂的关键描述符. 这一发现使下一代DAFC技术的催化剂设计更有效.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
能源转换能源转换

背景情况:

低温直接氨燃料电池 (DAFC) 与燃料电池相比,提供了更高的安全性.
用于氨氧化反应 (AOR) 的高效电催化剂对于DAFC的性能至关重要.
像d带中心这样的现有描述器往往无法准确预测AOR反应性.

研究的目的:

为了确定AOR电催化剂活性的一个更准确的描述符.
为合理的催化剂设计建立可靠的描述器-活动关系.
为高性能低温DAFC优化电催化剂.

主要方法:

使用d频段模型进行理论分析,推导出上方d频段边缘 (ε_u) 描述符.
合成和PtCo合金电催化剂的特征与不同的组成.
实验验证了 ε_u描述符与活动的关系,并进行了DAFC性能测试.

主要成果:

上部d频段边缘 (ε_u) 与AOR活动有效相关,在PtCo合金中实现R² = 0.90.
优化的电催化剂在5mVs-1下显示了74.04A g-1的峰值电流密度.
组装的DAFC系统表现出高功率密度,超过了许多报告的系统.

结论:

上方的d频段边缘是预测AOR电催化剂性能的一个优越描述符.
这项工作提供了对电子结构-反应性关系的基本见解.
这些发现有助于合理设计用于低温DAFC的先进电催化剂.

关键词:

活动描述符活动描述符氨氧化反应是氨氧化反应.在d频段模型中,d频段是直接氨燃料电池的燃料电池是直接氨的.上部D频段边缘的边缘

更多相关视频

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

Published on: September 20, 2012

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

相关概念视频

NMR Spectroscopy Of Amines

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...