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相关概念视频

Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation

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Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is...
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Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited Zn1-xMgxO
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通过Ba分散优化表面电子结构,以提高高温氧气演变反应活动

Hewei Liu1,2, Mengna Wang2,3, Tianfu Liu2

  • 1College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034 China.

Journal of the American Chemical Society
|July 4, 2025
PubMed
概括

(Ba) 分散增强了固体氧化物电解细胞 (SOEC) 的Pr0.9CoO3-δ阳极. 这种表面修饰提高了氧气演变反应活性,并降低了极化阻力,以实现高效的能量转换.

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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科学领域:

  • 材料科学
  • 电化学
  • 催化剂

背景情况:

  • 矿氧化物的表面修饰对于优化工作功能和增强催化活性至关重要.
  • 矿氧化物是固体氧化物电解电池 (SOEC) 中的关键材料,用于能量转换.
  • 工程表面电子结构影响电子/离子转移和反应中间吸附.

研究的目的:

  • 在SOEC中修改Pr0.9CoO3-δ阳极的表面电子结构.
  • 研究高温 (Ba) 分散对阳极性能的影响.
  • 增强氧化演化反应 (OER) 活性并降低极化阻力.

主要方法:

  • 在Pr0.9CoO3-δ阳极上的Ba物种的高温分散.
  • 综合结构和电化学特征.
  • 在现场表征和密度函数理论 (DFT) 的计算.

主要成果:

  • Ba分散显著增强了Co和O原子之间的表面d-p轨道杂交.
  • 减弱的Co-O对应性促进了氧空位的形成和氧离子的移动性.
  • 在1.6V和800°C下,Ba分散的阳极显示出较低的极化阻力和较高的OER活性 (3.36A·cm-2).

结论:

  • 高温Ba分散是一种用于设计SOEC阳极表面电子结构的新策略.
  • 这种方法有效地提高了催化活性和电化学性能.
  • 这些发现提供了对有效能源转换的合理催化剂设计的见解.