Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

9.9K
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.
9.9K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

10.8K
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.
10.8K
Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

6.1K
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...
6.1K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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
Radical Autoxidation01:20

Radical Autoxidation

2.1K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.1K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation 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

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Single-crystal-like polymer semiconductors via self-templated gradient assembly for ultrahigh charge carrier mobility.

Nature materials·2026
Same author

Tungsten-Doped RuO<sub>2</sub> Enables Direct Chloride Adsorption and Accelerated Krishtalik Kinetics for Industrial Chlor-Alkali Electrolysis.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same author

In Vivo Metabolic Profiling of Equisetum debile Roxb. in Rats Based on High-Resolution Mass Spectrometry.

Biomedical chromatography : BMC·2026
Same author

GW-BSE for molecular excited states in REST: State-of-the-art methods, acceleration strategies, and the LAMB approximation.

The Journal of chemical physics·2026
Same author

Computing Paramagnetic <sup>13</sup>C NMR Chemical Shifts of Cobalt(II) Porphyrins with the eXtended ONIOM Method.

Journal of chemical theory and computation·2026
Same author

In search of density functional approximations for accurate evaluation of NMR shielding constants for main-group nuclei: Analytic derivatives, benchmarking, and insights from density-corrected density functional theory.

The Journal of chemical physics·2026

Related Experiment Video

Updated: May 28, 2025

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

7.6K

Ultrastable supported oxygen evolution electrocatalyst formed by ripening-induced embedding.

Wenjuan Shi1, Tonghao Shen2, Chengkun Xing1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, China.

Science (New York, N.Y.)
|February 13, 2025
PubMed
Summary
This summary is machine-generated.

A new method embeds iridium catalysts in cerium oxide, enhancing proton exchange membrane water electrolyzer (PEMWE) stability and efficiency. This breakthrough supports terawatt-scale hydrogen production with a durable, low-loading oxygen evolution catalyst.

More Related Videos

Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
10:44

Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors

Published on: January 31, 2025

510
Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
09:02

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

7.7K

Related Experiment Videos

Last Updated: May 28, 2025

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

7.6K
Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
10:44

Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors

Published on: January 31, 2025

510
Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
09:02

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

7.7K

Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Proton exchange membrane water electrolyzer (PEMWE) technology requires efficient, stable, and cost-effective oxygen evolution catalysts for terawatt-scale deployment.
  • Iridium (Ir) catalysts, while active, suffer from poor stability due to dissolution, redeposition, detachment, and agglomeration.

Purpose of the Study:

  • To develop a novel strategy for stabilizing iridium catalysts for oxygen evolution reactions in PEMWEs.
  • To improve the long-term durability and efficiency of PEMWEs through catalyst support engineering.

Main Methods:

  • A ripening-induced embedding strategy was employed to anchor iridium catalyst nanoparticles within a cerium oxide support.
  • Cryogenic electron tomography and all-atom kinetic Monte Carlo simulations were used to analyze the synthesis mechanism.
  • Accelerated aging tests (6000 hours) were conducted to evaluate catalyst stability and performance.

Main Results:

  • The embedding strategy successfully stabilized iridium species, preventing degradation.
  • The synthesized catalyst achieved a low Ir loading (0.3 mg/cm²) with high performance (1.72 V at 3 A/cm²).
  • Exceptional long-term stability was demonstrated with a voltage degradation rate of 1.33 µV/h.

Conclusions:

  • Synchronizing support growth and Ir nucleation via sonication is crucial for effective catalyst embedding.
  • The developed embedded Ir catalyst offers a promising solution for stable and efficient oxygen evolution in future PEMWE systems.
  • This approach paves the way for cost-effective and durable catalysts essential for large-scale green hydrogen production.