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相关概念视频

Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Phase Diagram01:19

Phase Diagram

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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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岩层的第一个阶段是Ir.

Shuai Zhang1, Leilei Yin1, Qingqing Li1

  • 1Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Haihe Laboratory of Sustainable Chemical Transformations, Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University Tianjin 300350 China.

Chemical science
|June 9, 2023
PubMed
概括
此摘要是机器生成的。

研究人员在石墨烯上开发了新的金属间-萨马 (Ir2Sm) 纳米粒子,用于高级酸氧演化反应 (OER). 这些催化剂表现出增强的活性和稳定性,为设计高效的电催化剂提供了一条新的途径.

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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 (RE) 金属间纳米粒子 (NP) 对于催化至关重要,但由于RE金属的特性,合成具有挑战性.
  • 为氧化演化反应 (OER) 开发高效的电催化剂对于能源应用至关重要.

研究的目的:

  • 在石墨烯上合成和描述新的金属间-萨马 (Ir2Sm) 纳米粒子.
  • 评估Ir2SmNP作为酸氧演化反应 (OER) 的电催化剂的性能.

主要方法:

  • 在石墨烯支架上合成金属间Ir2SmNP.
  • 合成材料的结构特征.
  • 在酸性介质中对OER活性和稳定性的电化学测试.
  • 密度函数理论 (DFT) 计算以了解催化机制.

主要成果:

  • 成功合成了一种新的C15立方MgCu2类型的Laves相间金属Ir2Sm.
  • Ir2Sm NPs在1.53V时表现出1.24A mgIr-1的质量活性,在10mA cm-2.0时表现出120h的稳定性.
  • 与纯的IrNP相比,实现了5.6倍更高的质量活性和12倍更高的稳定性.
  • DFT的计算证实,Sm合金调节了Ir的电子结构,降低了中间约束能量,并增强了OER动力学.

结论:

  • 金属间的Ir2SmNP代表了酸性OER的高效电催化剂.
  • 这项研究展示了设计高性能稀土合金催化剂的新策略.
  • 这项工作为稀土金属间在催化中的应用开辟了新的途径.