Related Experiment Video
Updated: Feb 8, 2026
05:15
Flash Infrared Annealing for Perovskite Solar Cell Processing
Published on: February 3, 2021
8.7K
Energetics of Nanoparticle Exsolution from Perovskite Oxides
Yang Gao1,2, Ziheng Lu1, Tsam Lung You1
1Department of Mechanical and Aerospace Engineering , The Hong Kong University of Science and Technology , Hong Kong , SAR, China.
The Journal of Physical Chemistry Letters
|June 19, 2018
Summary
In situ exsolution of nickel nanoparticles on perovskite oxides enhances electrochemical performance. Surface vacancies and termination significantly influence nickel migration and nanoparticle formation, leading to improved stability and activity.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Chemistry
Background:
- Active metal nanoparticles boost electrochemical performance in ABO3 perovskite oxides.
- In situ exsolution offers superior nanoparticle stability compared to conventional deposition methods.
Purpose of the Study:
- Investigate the energetics of transition metal atom migration during in situ exsolution.
- Understand the influence of surface orientation and composition on nanoparticle formation in SrTiO3.
Main Methods:
- Utilized ab initio computations to model surface energetics.
- Employed experimental studies using a SrTiO3-based model system.
Main Results:
- Calculations revealed preferential Ni segregation to (100)-oriented, SrTiO-terminated surfaces.
- Sr-site and O-site vacancies promoted Ni segregation, while La doping inhibited it.
- Experiments confirmed computational predictions, showing enhanced activity with Sr vacancies and no La.
Conclusions:
- Surface vacancies and termination critically control in situ nanoparticle exsolution in perovskite oxides.
- The developed approach can guide the design of new materials for enhanced catalytic activity and stability.
- This study provides a mechanistic understanding for optimizing nanoparticle exsolution processes.
Related Concept Videos
02:35Energetics of Solution Formation
7.4K
The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Formation of the solution requires the solute–solute and solvent–solvent...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Formation of the solution requires the solute–solute and solvent–solvent...
7.4K
03:14Oxidation Numbers
42.9K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
42.9K
01:15Pyruvate Oxidation
169.1K
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
169.1K
03:11Oxidation-Reduction Reactions
75.8K
Oxidation–Reduction Reactions
75.8K
02:37Oxidation of Alcohols
16.2K
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:
16.2K
01:17Oxidation of Phenols to Quinones
4.8K
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...
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...
4.8K