同时重建NiOOH@β-Ni(Fe) OOOH的相锁定,以在高电流密度下实现强大的氧气演变
Ximin Li1, Min Ruan2, Yue Shen3
1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
ACS applied materials & interfaces
|July 22, 2025
概括
同时将NiMoO4@NiFe LDH重建为NiOOH@β-Ni(Fe) OOH,可以保持电催化剂的活性和稳定性. 这种异质的接口抑制了有害的过电,提高了水电解的耐用性.
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:
- 在氧化演化过程中,NiFe层状双氧化物 (LDH) 重建为β-Ni(Fe) OOH,这可能会过载到不活跃的γ-Ni(Fe) OOH.
- 高电位和高电流密度条件加快了这种有害的过电,降低了电催化剂的性能.
研究的目的:
- 制定一项战略,以在苛刻的条件下保持基于NiFe的电催化剂的活性和稳定性.
- 在重建的异质材料中研究相稳定机制.
主要方法:
- 同时重建NiMoO4@NiFe LDH成为NiOOH@β-Ni(Fe) OOOH.
- 电化学测试,包括超电位测量和安离子交换膜水电解器 (AEMWE) 的稳定性测试.
- 在现场拉曼光谱和密度函数理论 (DFT) 计算.
主要成果:
- 在AEMWE中,NiOOH@β-Ni(Fe) OOH催化剂在10 mA cm−2和1 A cm−2的1.81 V下实现了203 mV的超低超电位.
- 显示显著增强的稳定性,降解率为1.86mVh-1在1A cm-2下,比γ-Ni{\Fe (OOH) }低9.5倍以上.
- 现场和DFT研究表明,异质接口通过接口电子捐赠抑制过电.
结论:
- 同时重建创建一个稳定的NiOOH@β-Ni(Fe) OOOH阶段,有效地防止过度充电到不活跃的γ-Ni(Fe) OOOH.
- 异质接口在相锁定和增强电催化剂稳定性方面发挥着至关重要的作用.
- 这种方法为开发高效和耐用的电催化剂提供了一个有希望的途径,用于水分.
相关概念视频
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
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.
01:46Oxidative Cleavage of Alkenes: Ozonolysis
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.
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
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.
01:17Oxidation of Phenols to Quinones
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
01:19Phase I Oxidative Reactions: Overview
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...
01:26Oxygenic Photosynthesis
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...