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相关概念视频

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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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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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...
1.0K
IR Spectrum01:19

IR Spectrum

858
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
858
IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

574
When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with...
574
IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

5.0K
Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...
5.0K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

666
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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相关实验视频

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High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
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低含量Ir0.10Mn0.90O2 固体溶液,用于在酸性介质中高活性氧的演化.

Hongyan Hu1, Shilong Liu1, Hongfei Sun1

  • 1Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials (Ministry of Education), Anhui University, Hefei, 230601, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|April 3, 2025
PubMed
概括

这项研究设计了一种新型的氧化物催化剂 (Ir0.10Mn0.90O2),用于水电解中的高效氧化演变反应. 新材料显著提高了催化活性和稳定性,同时降低了含量.

关键词:
MnO2 MnO2 是一种有机物.在酸性介质中的OER.电催化剂是一种电催化剂.低含量的催化剂具有较低的含量.一个固体溶液固体溶液.

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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
  • 催化剂是一种催化剂.

背景情况:

  • (Ir) 基材料是氧化演化反应 (OER) 在质子交换膜水电解 (PEMWE) 中的关键电催化剂.
  • 目前基于Ir的催化剂的高成本和有限的活性阻碍了商业化.
  • 优化原子能利用效率对于开发具有成本效益的开放式能源催化剂至关重要.

研究的目的:

  • 为了提高OER性能,设计一个具有最小Ir含量的鲁结构固体溶液催化剂.
  • 在IrO2-MnO2系统中通过相位边界分析确定最佳的Ir含量.
  • 研究在酸性电解质中开发的基于Ir的催化剂的催化活性和稳定性.

主要方法:

  • 一种具有鲁结构的IrO2-MnO2固体溶液的合成,含有最小的Ir含量 (Ir0.10Mn0.90O2).
  • 在酸性电解质中对OER性能进行电化学评估,包括质量活性测量.
  • 在质子交换膜水电解 (PEMWE) 操作期间进行长期稳定性测试.
  • 密度函数理论 (DFT) 计算以阐明催化机制.

主要成果:

  • 催化剂Ir0.10Mn0.90O2的质量活动达到1135Ag-1Ir300mV的超电位,大约是商业Iro2的50倍.
  • 证明了出色的稳定性,在PEMWE中在200 mA cm-2下运行120小时.
  • DFT的计算显示,在Ir位点的电子吸收效应促进基化,增强OER活动.

结论:

  • 开发的Ir0.10Mn0.90O2固溶液催化剂与商业的IrO2相比,提供了优越的OER性能和稳定性.
  • 这种材料在降低Ir含量方面取得了重大进展,以实现成本效益高的水电解.
  • 这些发现为设计用于清洁能源应用的高活性和稳定的电催化剂提供了途径.