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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Leveling Effect01:29

Leveling Effect

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In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the...
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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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高度CoNi-C接口,用于高效的性气演变.

Daoui Wang1, Shuo Wang1, Weihao Liao1

  • 1State Key Laboratory of Heavy Oil Processing, China University of Petroleum-, Beijing 102249, China.

Journal of colloid and interface science
|December 27, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的CoNi合金-碳电极,用于高效的性演变反应 (HER). 新设计最大限度地提高了接口度,促进了的生产,并为水电解剂提供了特殊的稳定性.

关键词:
性的进化过程在 CoNi-C 界面上.专注 集中 集中 集中前身的尺寸是前身的大小.

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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:

  • 高效的演化反应 (HER) 对可持续能源技术至关重要.
  • 传统的金属-碳接口通常具有低度,限制了催化活性.
  • 开发提高接口密度的策略是提高 HER 性能的关键.

研究的目的:

  • 设计一个具有高度CoNi合金-碳接口的自承载电极.
  • 调查前体尺寸工程对金属分散和接口密度的影响.
  • 在性介质和离子交换膜水电解剂 (AEMWE) 中评估开发电极的 HER 性能和稳定性.

主要方法:

  • 采用ZIF-67的电解与Ni(NO3) 2和三酸合成可调节的Co,Ni含有三酸 (Co$_{x}$Ni-BTC) 前体.
  • 前体的热解以形成控制界面度的Co$_{x}$Ni-C/NF电极.
  • HER性能 (超电位,Tafel斜率) 的电化学表征和长期稳定性测试.
  • 密度函数理论 (DFT) 计算以阐明增强 HER 的机制.

主要成果:

  • 通过前体尺寸工程,在泡 (Co$_{x}$Ni-C/NF) 上实现了高度缩的CoNi-碳接口 (高达4%).
  • Co$_{50Ni-C/NF电极在1M KOH中表现出极好的HER性能:低超电位 (30 mV cm$^{-2}$在10 mA cm$^{-2}$),Tafel斜率 (45.1 mV dec$^{-1}$) 和72小时的稳定性.
  • 在AEMWE中,Ni-C/NF Co$_{50}/NF 系统在1.93 V下达到0.5 A cm$^{-2}$,并在0.2 A cm$^{-2}$下保持100小时的稳定性.

结论:

  • 开发的具有高度接口的CoNi-C/NF电极显著提高了性HER的性能和耐用性.
  • 前体尺寸工程是一种有效的策略,用于控制催化剂中的金属分散和接口密度.
  • DFT计算证实,密集的接口提高了导电性,水吸附性和进化动力学,为先进的HER电极提供了一个有前途的路线.