Related Experiment Video
Updated: Sep 28, 2025
09:35
Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
5.1K
Facet-Defined Strain-Free Spinel Oxide for Oxygen Reduction
Jinwoung Jo1,2, Ji Mun Yoo1,2, Dong Hyeon Mok3
1Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea.
Nano Letters
|March 31, 2022
Summary
This study developed a new cobalt-manganese oxide catalyst with a specific surface structure. Optimized catalyst composition enhances oxygen reduction reaction (ORR) activity and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Facet and surface strain significantly impact catalytic performance.
- Controlling these factors for specific facets is synthetically challenging.
- Understanding composition-dependent activity under strain is crucial for catalyst design.
Purpose of the Study:
- To synthesize a (001) facet-defined Co-Mn spinel oxide with tunable surface compositions.
- To investigate the influence of surface composition and strain on oxygen reduction reaction (ORR) activity.
- To establish a platform for studying composition-structure-activity relationships in electrocatalysis.
Main Methods:
- Epitaxial growth of Co-Mn spinel oxide on Co3O4 nanocube templates.
- Composition gradient synthesis to manage strain.
- Experimental and computational analyses of ORR activity.
- Electrochemical testing including chronoamperometry.
Main Results:
- Achieved (001) facet-defined Co-Mn spinel oxide surfaces with varying Mn/Co ratios.
- Demonstrated a volcano-like trend in ORR activity correlating with Mn/Co ratios.
- Identified Co0.5Mn0.5 as optimal, showing high ORR activity (0.894 V vs RHE) and stability.
- Minimized surface strain effects through layer-by-layer strain relief.
Conclusions:
- Controlled facet and strain engineering are effective for tuning electrocatalytic performance.
- The Co-Mn spinel oxide system provides insights into composition-structure-activity relationships.
- This work offers a well-defined platform for advanced electrocatalyst development.
Related Concept Videos
03:11Oxidation-Reduction Reactions
67.8K
Oxidation–Reduction Reactions
67.8K
01:19Oxidation and Reduction of Organic Molecules
7.9K
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...
7.9K
01:46Oxidative Cleavage of Alkenes: Ozonolysis
11.3K
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.
11.3K
01:23Redox Equilibria: Overview
1.2K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.2K
01:17Spin–Spin Coupling: One-Bond Coupling
1.1K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.1K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.9K
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.
10.9K