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相关概念视频

Acidity of Carboxylic Acids01:21

Acidity of Carboxylic Acids

6.7K
Carboxylic acids are the strongest organic acids. However, their acidic strength is much less than mineral acids like HCl. Carboxylic acids ionize in water and readily lose the hydroxyl proton to form a resonance-stabilized carboxylate ion.
6.7K
Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

30.6K
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with...
30.6K
Substituent Effects on Acidity of Carboxylic Acids01:31

Substituent Effects on Acidity of Carboxylic Acids

6.5K
The acidity of carboxylic acids is influenced by the nature of the substituents bounded to the functional group. The acid strength is determined by the stability of the carboxylate anion—the conjugate base formed by dissociating the corresponding carboxylic acid.
6.5K
Leveling Effect01:29

Leveling Effect

743
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...
743
Molecular Structure and Acidity02:34

Molecular Structure and Acidity

16.7K
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
16.7K
Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

7.9K
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):
7.9K

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Determination of the Gas-phase Acidities of Oligopeptides
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增强的酸性CO2-to-C2+通过离子液层修改来减少.

Qiyou Wang1, Yuxiang Liu1, Yao Tan1

  • 1Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, State Key Laboratory of Powder Metallurgy, School of Physics, Central South University, Changsha, 410083, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
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概括
此摘要是机器生成的。

铜催化剂的离子液体修饰显著增加了酸性CO2的电还原到C2+产品. 这一策略增强了二氧化碳吸附,抑制了的演变,实现了高效率和耐用性.

关键词:
*CO 中间物质 *CO 中间物质二氧化碳的电还原 CO2 的电还原.酸性电解质是一种酸性电解质.疏水性是指对水的疏水性.离子液体是一种离子液体.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 催化剂是一种催化剂.

背景情况:

  • 酸性CO2电还原 (CO2RR) 对于碳减排至关重要,但在C2+产品选择性方面面临挑战.
  • 弱CO吸附和竞争性H*吸附在酸性介质中的极限效率.

研究的目的:

  • 开发一种有效的策略,以提高酸性介质中的CO2RR.
  • 为了克服CO吸附和H*竞争对Cu催化剂的限制.

主要方法:

  • 密度函数理论 (DFT) 计算来预测催化剂的行为.
  • 使用离子液体[PMIM][NTf2]对Cu表面进行阴离子离子变异.
  • 电化学性能测试,电阻测试和ATR-IR光谱学.

主要成果:

  • [PMIM][NTf2]修饰通过准结合加强了CO吸附.
  • 离子液体层创造了一个疏水的环境,减少H*覆盖.
  • 实现了高C2+部分电流密度 (~640 mA cm-2),具有80.1%的法拉达效率和~20小时的耐用性.

结论:

  • 阴离子 - 阴离子修饰是增强酸性CO2RR的可行策略.
  • [PMIM][NTf2]修改的Cu催化剂在C2+生产中显示出显著的改善.
  • 这种方法为高效的碳利用提供了一个有希望的途径.