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Formation of Complex Ions

Formation of Complex Ions

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...

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

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Related Experiment Video

Updated: Sep 20, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

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Synergistic capture and conversion of polysulfides in cathode composites with multidimensional framework structures.

Meng Xiang¹, Jiajin Li¹, Shuaiqiang Feng¹

¹College of Science, Guilin University of Technology, Guilin 541004, PR China.

Journal of Colloid and Interface Science

|June 6, 2022

Summary

This study introduces novel NC-Co@Mo2C materials for lithium-sulfur batteries, significantly enhancing cycle stability and sulfur utilization by suppressing the polysulfide shuttle effect.

Keywords:

Lithium–sulfur battery Mo(2)C Shuttle effect ZIF-67

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Last Updated: Sep 20, 2025

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A Dual-Functional Electroactive Filter Towards Simultaneously SbIII Oxidation and Sequestration

A Dual-Functional Electroactive Filter Towards Simultaneously SbIII Oxidation and Sequestration

Published on: December 5, 2019

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from poor cycle stability and low sulfur utilization.
The polysulfide shuttle effect and slow reaction kinetics are primary limitations hindering practical Li-S battery applications.

Purpose of the Study:

To develop advanced cathode materials for Li-S batteries to overcome current performance limitations.
To investigate the synergistic effects of Mo2C nanorods, nitrogen-doped carbon, and cobalt nanoparticles for improved Li-S battery performance.

Main Methods:

Synthesis of Mo2C nanorods surface-decorated with metallic-organic framework-derived nitrogen-doped carbon and ultrasmall cobalt nanoparticles (NC-Co@Mo2C).
Fabrication of NC-Co@Mo2C@S composites for Li-S battery cathodes.
Electrochemical characterization including specific capacity and cycling stability tests.

Main Results:

The NC-Co@Mo2C@S composites exhibited a high specific capacity of 1073 mAh·g−1 at 0.2 C and retained 806 mAh·g−1 after 200 cycles.
Mo2C nanorods effectively adsorbed lithium polysulfides (LiPSs) via Mo-S bonds.
Cobalt nanoparticles catalyzed LiPSs redox conversion, while nitrogen doping reduced the energy barrier, and the composite structure facilitated ion and electron transport.

Conclusions:

The synergistic effects of Mo2C's adsorption and cobalt's catalytic properties effectively immobilize sulfur and suppress the shuttle effect.
The developed NC-Co@Mo2C cathode material demonstrates excellent discharge specific capacity and cycling stability for Li-S batteries.
This approach offers a promising strategy for advancing the performance of next-generation Li-S energy storage systems.