Related Experiment Video
Updated: Jul 28, 2026
08:51
Monitoring Protein Adsorption with Solid-state Nanopores
Published on: December 2, 2011
Effect of pore packing defects in 2-d ordered mesoporous carbons on ionic transport
Da-Wei Wang1, Feng Li, Hai-Tao Fang
1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
The Journal of Physical Chemistry. B
|April 28, 2006
Summary
Pore packing defects in ordered mesoporous carbons significantly hinder ion diffusion, leading to reduced supercapacitor performance at higher scan rates. This highlights defects as a key factor in material design for energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Ordered mesoporous materials (OMMs) are crucial in energy, environmental, and chemical applications.
- Ion diffusion within mesoporous networks is vital for energy storage devices like supercapacitors.
- Ordered mesoporous carbons (OMCs) are widely studied for supercapacitor applications.
Purpose of the Study:
- To investigate ion diffusion behavior in two distinct 2-D hexagonal OMCs.
- To correlate pore structure variations with electrochemical performance.
- To identify dominant factors affecting ion diffusion dynamics in OMCs.
Main Methods:
- Cyclic voltammetry and electrochemical impedance spectroscopy were employed to study ion diffusion.
- Transmission electron microscopy (TEM) and small-angle X-ray diffraction (SAXRD) analyzed pore structure.
- Nitrogen cryosorption determined pore size distribution and surface area variations.
Main Results:
- OMCs with defective pore channels (pore packing defects) exhibited significantly reduced gravimetric capacitance at increased voltage scan rates.
- Similar mesopore size distributions were observed in both OMCs studied.
- Pore packing defects were identified as a critical factor influencing ion diffusion.
Conclusions:
- For 2-D hexagonal OMCs with comparable mesopore sizes, pore packing defects are a primary determinant of ion diffusion dynamics.
- Minimizing pore packing defects is essential for optimizing the performance of OMCs in supercapacitors.
- Understanding and controlling pore structure defects are key to advancing OMC-based energy storage technologies.
More Related Videos
10:31Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores
Published on: December 6, 2015
09:31Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
Published on: March 27, 2019
Related Concept Videos
02:54Molecular and Ionic Solids
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
02:42Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
01:44The Significance of Membrane Transport
The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
01:31Transport Number
The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
01:23Pore Size Distribution
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
Adequate...