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

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K
G-protein Coupled Receptors01:21

G-protein Coupled Receptors

132.0K
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
132.0K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
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,...
1.5K
Couple01:29

Couple

1.0K
A couple is a pair of parallel forces equal in magnitude but in opposite directions. The forces are separated by a perpendicular distance, known as the couple's arm. The couple causes a rotation force or moment that rotates the body about an axis perpendicular to the plane of the forces. The resulting moment is referred to as the couple moment. The SI unit of a couple moment is the Newton-meter (N-m).
A typical example to understand this concept is tightening a bolt with a lug wrench. A...
1.0K
Work of a Couple Moment01:12

Work of a Couple Moment

1.1K
Mechanical engineering involves the study of motion, energy, and force, and is concerned with designing, manufacturing, and maintaining mechanical systems. One important concept in this field is the couple moment, produced by two equal and opposite forces acting at two points in a rigid body separated by a certain distance.
When the rigid body undergoes a differential displacement due to a couple, its motion can be divided into two parts: equal translation of the two points to their final...
1.1K

You might also read

Related Articles

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

Sort by
Same author

Development and Evaluation of a Nurse Competency Assessment System for Public Health Emergencies.

Nursing research and practice·2026
Same author

Cu Nanoclusters and Rh Single-Atom-Modified N-Doped Carbon for Electroreduction of Nitrate to Ammonia.

Inorganic chemistry·2025
Same author

Sulfur species induced Fe<sup>3+</sup> and Co<sup>3+</sup> enrichment in a low-crystalline FeCoNi hydroxide boosts water oxidation.

Chemical communications (Cambridge, England)·2025
Same author

Strong electronic interaction enhanced electrocatalysis of copper phthalocyanine decorated Co-MOF-74 toward highly efficient oxygen evolution reaction.

RSC advances·2024
Same author

Alterations in maternal-fetal gut and amniotic fluid microbiota associated with fetal growth restriction.

BMC pregnancy and childbirth·2024
Same author

Ru Single-Atom Nanoarchitectonics on Co-Based Conducting Metal-Organic Frameworks for Enhanced Oxygen Evolution Reaction.

Inorganic chemistry·2024

Related Experiment Video

Updated: Feb 5, 2026

A Practical Guide on Coupling a Scanning Mobility Sizer and Inductively Coupled Plasma Mass Spectrometer SMPS-ICPMS
11:18

A Practical Guide on Coupling a Scanning Mobility Sizer and Inductively Coupled Plasma Mass Spectrometer SMPS-ICPMS

Published on: July 11, 2017

11.2K

Coupling FeSe

Kailu Guo1, Zehua Zou, Jing Du

  • 1State Key Laboratory of Applied Organic Chemistry, Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China. xucl@lzu.edu.cn.

Chemical Communications (Cambridge, England)
|September 19, 2018
PubMed
Summary
This summary is machine-generated.

A new cobalt-selenium/iron-diselenide (CoSe/FeSe2) nanohybrid catalyst improves oxygen evolution reaction (OER) performance. This advanced electrocatalyst outperforms individual components due to its unique structure and enhanced electrical coupling.

More Related Videos

Quantifying Agonist Activity at G Protein-coupled Receptors
11:45

Quantifying Agonist Activity at G Protein-coupled Receptors

Published on: December 26, 2011

19.8K
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

6.4K

Related Experiment Videos

Last Updated: Feb 5, 2026

A Practical Guide on Coupling a Scanning Mobility Sizer and Inductively Coupled Plasma Mass Spectrometer SMPS-ICPMS
11:18

A Practical Guide on Coupling a Scanning Mobility Sizer and Inductively Coupled Plasma Mass Spectrometer SMPS-ICPMS

Published on: July 11, 2017

11.2K
Quantifying Agonist Activity at G Protein-coupled Receptors
11:45

Quantifying Agonist Activity at G Protein-coupled Receptors

Published on: December 26, 2011

19.8K
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

6.4K

Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • The oxygen evolution reaction (OER) is crucial for energy conversion technologies like water splitting.
  • Developing efficient and cost-effective electrocatalysts for OER remains a significant challenge.
  • Nanohybrid materials offer unique properties for enhanced catalytic activity.

Purpose of the Study:

  • To synthesize a novel CoSe/FeSe2 nanohybrid electrocatalyst.
  • To investigate the OER performance of the CoSe/FeSe2 nanohybrid.
  • To understand the structure-property relationships governing the enhanced OER activity.

Main Methods:

  • A simple one-step hydrothermal synthesis method was employed.
  • The morphology and composition of the nanohybrid were characterized using advanced techniques.
  • Electrochemical measurements were performed to evaluate OER performance.

Main Results:

  • The CoSe/FeSe2 nanohybrid exhibited superior OER activity compared to individual CoSe and FeSe2.
  • The enhanced performance is attributed to the unique interface structure, abundant defects, hydrophilicity, and electrical coupling.
  • The nanohybrid demonstrated improved stability and efficiency in OER.

Conclusions:

  • The CoSe/FeSe2 nanohybrid is a promising electrocatalyst for the oxygen evolution reaction.
  • Interface engineering and defect control are effective strategies for designing high-performance electrocatalysts.
  • This work contributes to the advancement of materials for sustainable energy applications.