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

Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

524
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
524
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

644
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
644
Balancing Redox Equations02:58

Balancing Redox Equations

53.2K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
53.2K
Redox Equilibria: Overview01:23

Redox Equilibria: Overview

633
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...
633
Formation of Complex Ions03:45

Formation of Complex Ions

24.0K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
24.0K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

468
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
468

You might also read

Related Articles

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

Sort by
Same author

Shrimp TM9SF4 facilitates WSSV infection probably through interacting with viral VP24 and regulating host autophagy.

Fish & shellfish immunology·2026
Same author

<i>Akkermansia muciniphila</i> in cardiovascular diseases: opportunities and challenges.

Frontiers in microbiology·2026
Same author

Oxygen Electronic Configuration Modulation Triggering Reversible Anionic Redox Chemistry toward High Voltage Tolerant Sodium Layered Oxide.

Nano letters·2026
Same author

Predictive Value of First-Trimester Serum TREM2 and SIGLEC1 Levels for Adverse Pregnancy Outcomes in Women with PCOS.

International journal of general medicine·2026
Same author

Visible-Light-Induced Difunctionalization of Alkenes with Masked Trifluoroacetyl Reagents.

Organic letters·2026
Same author

Two-Step <i>Vibrio parahaemolyticus</i> Challenge Reveals Transcriptional Reprogramming of Trained Immunity in Shrimp Hemocytes.

Biology·2026

Related Experiment Video

Updated: Sep 6, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.1K

Stabilization of Multicationic Redox Chemistry in Polyanionic Cathode by Increasing Entropy.

Huangxu Li1,2, Ming Xu3, Huiwu Long2

  • 1School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South University, Changsha, 410083, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 2, 2022
PubMed
Summary

High-entropy polyanionic cathodes enable stable multisodium storage in rechargeable batteries. This approach enhances capacity and reversibility, overcoming key challenges for advanced energy storage materials.

Keywords:
cathode materialshigh entropymultiple redox reactionspolyanionic materialssodium-ion batteries

More Related Videos

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
09:17

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

12.0K
Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
09:41

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

9.6K

Related Experiment Videos

Last Updated: Sep 6, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.1K
Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
09:17

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

12.0K
Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
09:41

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

9.6K

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Polyanionic compounds offer compositional flexibility for electrode materials in rechargeable batteries.
  • Multisodium storage in polyanionic electrodes boosts capacity but faces challenges like irreversible capacity loss and phase evolution, especially at high voltages.

Purpose of the Study:

  • To enhance and stabilize multisodium storage in polyanionic cathodes by increasing the entropy of the host structure.
  • To explore the potential of high-entropy polyanionic materials for high-capacity and reversible sodium-ion battery applications.

Main Methods:

  • Synthesized a high-entropy polyanionic cathode: Na3.4Fe0.4Mn0.4V0.4Cr0.4Ti0.4(PO4)3.
  • Investigated multisodium storage properties under high-voltage operation (4.5 V vs Na/Na+).
  • Employed operando characterizations to elucidate the underlying storage mechanisms.

Main Results:

  • The high-entropy cathode demonstrated multicationic redox properties, achieving high capacity with good reversibility.
  • A stable trigonal phase was identified, exhibiting reduced volume changes during multisodium storage.
  • Synergistic effects from diverse transition metal species contributed to the enhanced electrochemical performance.

Conclusions:

  • Increasing the entropy of polyanionic host structures is an effective strategy to enhance and stabilize multisodium storage.
  • High-entropy polyanionic cathodes show promise for developing high-performance rechargeable batteries.
  • The findings highlight the potential of the high-entropy concept for discovering novel polyanionic electrode materials.