Related Experiment Video
Updated: Apr 5, 2026
11:25
In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
Published on: November 10, 2014
16.4K
Dynamic Charge Storage in Ionic Liquids-Filled Nanopores: Insight from a Computational Cyclic Voltammetry Study
Yadong He1, Jingsong Huang, Bobby G Sumpter
1†Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States.
The Journal of Physical Chemistry Letters
|August 12, 2015
Summary
Supercapacitors store charge dynamically in nanoporous electrodes using ionic liquids. High scan rates reveal counterion dominance and perm-selective storage, crucial for energy density optimization.
Area of Science:
- Electrochemistry
- Materials Science
- Computational Chemistry
Background:
- Supercapacitors are vital energy storage devices.
- Optimizing nanoporous electrodes with ionic liquids is key for high energy and power densities.
- Understanding dynamic charge storage mechanisms is essential.
Purpose of the Study:
- To investigate dynamic charge storage in subnanometer pores with ionic liquids.
- To elucidate the interplay between ion transport and ion dynamics during cyclic voltammetry.
- To explain experimentally observed perm-selective charge storage.
Main Methods:
- Coarse-grained molecular dynamics simulations.
- Cyclic voltammetry of supercapacitors with subnanometer pores.
- Analysis of ion occupancy and transport dynamics.
Main Results:
- Charge storage is governed by ion transport and pore dynamics.
- Ion occupancy varies cyclically with scan rate.
- At high scan rates, counterions dominate charge storage, leading to perm-selectivity.
Conclusions:
- Dynamic charge storage mechanisms in nanoporous supercapacitors clarified.
- Scan rate significantly influences ion behavior and charge storage efficiency.
- Findings provide insights for designing high-performance supercapacitors.
Keywords:
charging dynamicscyclic voltammetrydynamic charge storagenanoporeroom-temperature ionic liquidssupercapacitorMore Related Videos
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
6.1K
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
13.6K
Related Concept Videos
01:24Electrochemical Systems
130
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
130
01:30The Electrical Double Layer
173
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
173
01:10Voltammetric Techniques: Cyclic Voltammetry
2.0K
Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
2.0K
03:27Ions and Ionic Charges
81.2K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
81.2K
01:27The Debye–Hückel Theory of Electrolyte Solutions
241
The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means...
241
02:54Trends in Lattice Energy: Ion Size and Charge
27.3K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
27.3K