相关实验视频
Updated: May 13, 2025

09:41
Establishment of an Extracellular Acidic pH Culture System
Published on: November 19, 2017
14.6K
酸性CO2电解具有接近理想的选择性和碳效率,通过克服其固有的权衡,实现了碳效率
Li-Ping Chi1,2, Yu-Cai Zhang1, Zhuang-Zhuang Niu1
1Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China.
Angewandte Chemie (International ed. in English)
|April 14, 2025
概括
科学家们开发了一种聚胺修饰策略,以改善在酸性条件下的二氧化碳电还原 (CO2R). 这种方法克服了效率的权衡,实现了高单通碳效率和CO2R产品的法拉第效率.
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:
- 酸性电解质为二氧化碳电还原 (CO2R) 提供了一个有希望的途径,避免了性或中性介质中出现的问题.
- 高酸盐度 (≥3M) 通常需要用于CO2激活和抑制降水,但这导致碳酸盐的形成和低单通碳效率 (SPCE).
- 为了更高的法拉第效率 (FE),加大阴离子度和在CO2R中保持SPCE之间存在一个权衡.
研究的目的:
- 为了克服FE和SPCE在酸性CO2R中的权衡.
- 为高效的二氧化碳激活和减少稀释酸性电解质开发一种新的战略.
- 展示一种用于提高二氧化碳电解中的碳和电子效率的实用方法.
主要方法:
- 对二氧化碳度对二氧化碳度影响的理论和实验分析.
- 开发一种聚胺修饰策略,利用氨基基组创建局部性微环境.
- 使用聚胺修饰的SnO2纳米粒子作为CO2R催化剂的概念验证实验.
主要成果:
- 聚胺修饰有效捕获质子,在电极表面建立局部性环境.
- 修改后的SnO2纳米粒子同时实现了近乎理想的SPCE (95.7%) 和高FE (96%对HCOOH).
- 这些结果是用稀释酸性电解质 (pH1.36) 与低离子度 (0.1M) 得到的.
结论:
- 聚胺修饰策略成功克服了酸性CO2R中固有的权衡.
- 这种方法可以高效地将二氧化碳转化为使用稀释电解质的酸等产品.
- 预计这些发现将加速开发高效和实用的酸性CO2电解系统.
相关概念视频
Acid Strength and Molecular Structure
30.4K
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...
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...
30.4K
Mixtures of Acids
19.4K
The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
19.4K
Acidity of Carboxylic Acids
6.5K
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.
6.5K
Polyprotic Acids
28.5K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
28.5K
Acids, Bases and Neutralization Reactions
6.1K
Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
6.1K
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

