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相关概念视频

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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Factors Influencing the Rate of Chemical Reactions01:22

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A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another....
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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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通过兴奋剂解读催化剂-支持相互作用,以实现高度活跃和持久的氧化进化催化剂

Jinyeop Kim1, Jinglong Guo2, Nannan Shan3,4

  • 1Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

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此摘要是机器生成的。

设计高效的氧化演化反应 (OER) 电催化剂需要平衡活性和稳定性. 这项研究表明,兴奋剂增强了OER活性,但降低了导电性,因此需要对耐用,高性能电催化剂进行谨慎的催化剂支持设计.

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科学领域:

  • 材料科学
  • 电化学
  • 催化剂

背景情况:

  • 为氧化演化反应 (OER) 设计电催化剂需要平衡内在活性与长期稳定性.
  • 基于Ir的催化剂对OER有希望,但它们的性能受到降解途径的限制.
  • 了解催化剂-支持相互作用对于优化开放式催化剂设计至关重要.

研究的目的:

  • 合理设计具有增强活性和耐久性的基于Ir的OER电催化剂.
  • 研究和氧化物对催化剂性能和稳定性的影响.
  • 建立一个系统层面的理解催化剂降解,以改善OER应用.

主要方法:

  • 合理的催化剂设计利用催化剂-支持相互作用.
  • 基于Ir的催化剂的Mo化.
  • 在现场分析技术和催化剂稳定性的比较评估.
  • 电化学测试以评估OER的活性和耐用性.

主要成果:

  • 通过促进高价值的Ir物种,Mo增强了内在的OER活性,但降低了电导率.
  • 氧化物支在稳定基于Ir的催化剂中起着至关重要的作用.
  • 接口工程是保持催化剂完整性和平衡电子推广与结构稳固性的关键.
  • 催化剂降解涉及相互连接的途径,需要系统层面的视角.

结论:

  • 考虑兴奋剂效应和支持相互作用的平衡设计策略对于优化OER电催化剂性能至关重要.
  • 具有强大的氧化物支的接口工程对于实现持久和活跃的OER电催化剂至关重要.
  • 需要系统层面的方法来了解和减轻OER电催化剂的降解途径.