通过在表面氧化泡上形成异构结构来调整CoCr-LDH的活性和稳定性,以提高水分裂性能
Suprobhat Singha Roy1,2, Ragunath Madhu1,2, Krishnendu Bera1,2
1Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India.
ACS applied materials & interfaces
|January 24, 2024
概括
研究人员开发了一种新的CoCr-LDH/NiO/NF催化剂,通过水分解有效地生产绿色. 这种强大的异构结构显示出出色的电催化活性和氧和演化反应的长期稳定性.
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:
- 通过电催化水分裂产生绿色对于可持续的能源未来至关重要.
- 开发具有成本效益和高效率的催化剂是该领域的一个关键挑战.
研究的目的:
- 设计和合成一种新,高效,稳定的异构结构催化剂,用于电催化水分裂.
- 调查CoCr-LDH/NiO/NF异构的电催化性能,无论是氧进化反应 (OER) 还是进化反应 (HER).
主要方法:
- 在泡 (NF) 上制造CoCr-LDH/NiO异构结构,使用简单的回火和生长方法.
- 在1MKOH溶液中对OER和HER的电催化性能评估,包括超电位,电流密度和长期稳定性测试.
- 使用实验前和后的技术,对催化剂的结构,形态和电子特性进行表征.
主要成果:
- CoCr-LDH/NiO/NF催化剂在50mA cm-2.2时显示出OER的253mV和HER的185mV的低超电位.
- 催化剂在60小时内对OER和HER以及整体水分裂过程表现出极好的长期稳定性.
- 与赤裸的CoCr-LDH相比,OER的营业额频率增加了1.85倍,Faradaic高效率为97.4% (OER) 和94.75% (HER).
结论:
- 开发的CoCr-LDH/NiO/NF异构结构是一种高效和强大的双功能电催化剂,用于水分.
- 增强的性能归因于改进的电子结构和纳米板形态,促进了离子/气体扩散和电子转移.
- 这项工作为设计绿色经济的先进催化剂提出了一个有希望的策略.
更多相关视频
相关概念视频
Hydrolysis
Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
Aldehydes and Ketones with Water: Hydrate Formation
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
Colloidal precipitates
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Coagulation
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...


