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相关概念视频

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
Most enzymes...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
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Updated: Jun 27, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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使用专利分析设计高效氧进化催化剂的指导设计.

Weiwei Zhang1, Yongzhi Zhao2, Jiali Xu1,3

  • 1School of Economics and Management, University of Science and Technology Beijing, Beijing 100083, China.

ACS omega
|April 29, 2024
PubMed
概括

这项研究引入了一种新的NiFeRu-碳催化剂,用于高效的氧化演化反应 (OER). 专利分析有助于设计这种高性能催化剂,对能量转换设备至关重要.

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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:

  • 高效的氧化演化反应 (OER) 催化剂对于水电解剂和燃料电池等能量转化技术至关重要.
  • 目前的催化剂设计和选择过程效率低下,阻碍了进展.
  • 将专利分析与催化剂设计相结合,为加速发现提供了一种新的方法.

研究的目的:

  • 通过将专利分析与催化剂设计相结合,开发一款高性能开放式资源催化剂.
  • 为了合成和表征一个NiFeRu-碳催化剂,以提高OER活动和稳定性.
  • 调查 (Ru) 兴奋剂在OER的NiFe层双氧化物 (LDH) 中的作用.

主要方法:

  • 专利分析被用来指导催化剂的设计和合成.
  • 合成了一种具有低负载 (0.3 wt %) 的NiFeRu-碳催化剂.
  • 评估了电化学性能,包括性条件下的超电位和长期稳定性.

主要成果:

  • NiFeRu-碳催化剂在10 mA cm-2.2时显示出219 mV的低超电位.
  • 催化剂保持了极好的稳定性,在200小时的连续运行后,超电压仅有15mV的衰减.
  • 发现高价值Ru补充剂可以增强NiFe-LDH催化位点的内在活性.

结论:

  • 专利分析的整合有效地帮助设计高效的开放资源催化剂.
  • 开发的NiFeRu-碳催化剂在OER应用中表现出卓越的性能和稳定性.
  • 兴奋剂和氧空缺的形成是提高NiFe-LDHs的催化活性和耐久性的关键因素.