揭示了在酸性介质中对氧化物演变的酸铁中合剂的作用
Shuangshuang Zhu1, Mingyuan Wang2, Yuguang Mao1
1Henan Key Laboratory of Quantum Materials and Quantum Energy, School of Quantum Information Future Technology, Henan University, Zhengzhou 450046, China. wfzhang@henu.edu.cn.
Chemical communications (Cambridge, England)
|November 20, 2024
概括
配合Co和Ni的铁增强了氧演化反应 (OER) 催化. 这一策略优化矿氧化物材料,以实现高效的电催化.
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:
- 矿氧化物是氧化演化反应 (OER) 的有希望的电催化剂.
- 优化它们的催化活性对于能源转换技术至关重要.
- 兴奋剂策略可以改变矿氧化物的电子和结构性质.
研究的目的:
- 调查 (Co) 和 (Ni) 配合对OER的铁催化剂的影响.
- 了解通过codoping增强催化活性的潜在机制.
- 提供用于催化工程的矿基材料的策略.
主要方法:
- 固态合成Co和Ni编的铁素颗粒. 固态合成.
- 为OER性能提供催化剂的电化学表征.
- 密度函数理论 (DFT) 计算以阐明兴奋剂效应.
主要成果:
- 与单独合的样本相比,Co 和 Ni 合的铁呈现出较低的塔菲尔斜率 (55 mV dec−1) 和超电位 (334 mV 在 10 mA cm−2).
- DFT的计算表明,Fe原子周围的电荷再分配,降低了能量障碍,并且由于coddoping增加了导电性.
- 观察到氧气演化反应的催化活性增强.
结论:
- 与Co和Ni的配合显著增强了铁酸盐的OER活性.
- 观察到的改进归因于电子结构的修改和减少的激活能量障碍.
- 这项研究提出了一个可行的策略,用于设计先进的矿氧化物电催化剂.
相关概念视频
03:06Alkali Metals
19.1K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
19.1K
01:26Alkali Aggregate Reaction in Concrete
88
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
88
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
10.9K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
10.9K
01:19Ionic Strength: Effects on Chemical Equilibria
1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.4K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
9.8K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
9.8K
02:37Oxidation of Alcohols
12.8K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
12.8K