在NiCo spinel中Fe,N-诱导的界面电子再分配在生物质衍生碳上,用于双功能氧气转换
Yanyan Liu1,2,3, Limin Zhou3, Shuling Liu2
1College of Science, Henan Agricultural University, Zhengzhou, 450002, P. R. China.
Angewandte Chemie (International ed. in English)
|February 26, 2024
概括
本研究介绍了一种Fe,N-doping策略,以增强碳支持的NiCo2O4催化剂的氧化转化. 优化的催化剂在氧气减少和演化反应中表现出卓越的性能,从而产生稳定的空气电池.
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:
- 开发高效的电催化剂对于能量转换设备至关重要.
- 斯宾尼尔NiCo2O4催化剂显示出希望,但需要优化以提高活性.
- 来自生物质的碳支为催化剂提供可持续和结构完整的平台.
研究的目的:
- 调查Fe和N兴奋剂对碳支持的NiCo2O4催化剂的影响.
- 阐明增强氧降解 (ORR) 和氧演化 (OER) 活动的机制.
- 为了评估空气电池 (ZAB) 中化催化剂的性能.
主要方法:
- 在生物质衍生碳 (NiCo1.8Fe0.2O4@N-碳) 上合成Fe,N-合的NiCo2O4.
- 电化学表征包括ORR和OER性能测试.
- 使用合成催化剂组装和测试空气电池.
主要成果:
- 兴奋剂诱导了Co和Ni之间的界面电子再分配,增强了ORR和OER活动.
- N-doping调节了碳的电子特性,为氧物种创造了活跃点.
- NiCo1.8Fe0.2O4@N-碳催化剂实现了高ORR半波潜力 (0.86V) 和低OER超电位 (270mV在10mA cm-2).
- 用这种催化剂组装的ZAB表现出极好的循环稳定性 (>2000个循环) 和高功率密度 (180mW cm-2).
结论:
- 这种Fe,N-doping策略有效地提高了NiCo2O4的电催化活性,用于氧气转化.
- 兴奋剂的协同效应和生物质衍生的碳支持导致了ZAB的杰出表现.
- 这项工作突出了开发高性能,可持续的能源应用催化剂的有希望的方法.
相关概念视频
Oxidation and Reduction of Organic Molecules
6.6K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
6.6K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Oxidative Cleavage of Alkenes: Ozonolysis
10.4K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.4K
Oxidation-Reduction Reactions
64.9K
Oxidation–Reduction Reactions
64.9K
Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems
97
Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen.
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...
97
Phase I Oxidative Reactions: Overview
272
Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
272


