Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Improving Energy Storage: Neutron Scattering Technique Provides New Data on Adsorption of Ions in Microporous Materials

This schematic shows the experimental setup for in-situ studies of ion adsorption on the surface of microporous carbon electrodes. Credit: Gleb Yushin
This schematic shows the experimental setup for in-situ studies of ion adsorption on the surface of microporous carbon electrodes.

Credit: Gleb Yushin

Abstract:
The adsorption of ions in microporous materials governs the operation of technologies as diverse as water desalination, energy storage, sensing and mechanical actuation. Until now, however, researchers attempting to improve the performance of these technologies haven't been able to directly and unambiguously identify how factors such as pore size, pore surface chemistry and electrolyte properties affect the concentration of ions in these materials as a function of the applied potential.

Improving Energy Storage: Neutron Scattering Technique Provides New Data on Adsorption of Ions in Microporous Materials

Atlanta, GA | Posted on February 28th, 2013

To provide the needed information, researchers at the Georgia Institute of Technology and the Oak Ridge National Laboratory have demonstrated that a technique known as small angle neutron scattering (SANS) can be used to study the effects of ions moving into nanoscale pores. Believed to be the first application of the SANS technique for studying ion surface adsorption in-situ, details of the research were reported recently in the journal Angewandte Chemie International Edition.

Using conductive nanoporous carbon, the researchers conducted proof-of-concept experiments to measure changes in the adsorption of hydrogen ions in pores of different sizes within the same material due to variations in solvent properties and applied electrical potential. Systematic studies performed with such a technique could ultimately help identify the optimal pore size, surface chemistry and electrolyte solvent properties necessary for either maximizing or minimizing the adsorption of ions under varying conditions.

"We need to understand this system better so we can predict the kind of surface chemistry required and the kinds of solvents needed to control the levels of ion penetration and adsorption in pores of different sizes," said Gleb Yushin, an associate professor in the Georgia Tech School of Materials Science and Engineering. "Understanding these processes better could lead to the development of improved energy storage, water purification and desalination systems. This new experimental methodology may also give us paths to better understand ion transport in biological systems and contribute to the development of improved drugs and artificial organs."

The research was supported partially by the U.S. Army Research Office, the Georgia Institute of Technology and the Oak Ridge National Laboratory (ORNL).

"The advantage of neutron scattering is that it can be used to study real systems," said Yushin. "You can study most electrode materials and electrolyte combinations as long as they have a high sensitivity for neutron scattering."

Yushin and his collaborators - Georgia Tech graduate research assistant Sofiane Boukhalfa, and Oak Ridge scientists Yuri Melnichenko and Lilin He - conducted the research using ORNL's High Flux Isotope Reactor, which produces a beam of high-energy neutrons. Their experimental setup allowed them to immerse activated carbon fabric samples - each sample containing pores of different sizes - in different electrolyte materials while varying the applied electrical potential.

By measuring how the neutron beam was scattered when it passed through the carbon fabric and electrolytes, the researchers could determine how the solvent, pore size and electrical potential affected the average ion concentration in the carbon material samples.

"You can learn whether the ions get adsorbed into small pores or large pores by simply comparing the changes in the neutron scattering," Yushin explained. "This experimental technique allows us to independently change the surface chemistry to see how that affects the ion concentrations, and we can use different solvents to observe how the interaction between electrolyte and pore walls affects the ion adsorption in pores of different sizes. We can further identify exactly where the ion adsorption takes place even when no potential is applied to an electrode."

Earlier work in this area had not provided clear results.

"There have been multiple prior studies on the pore size effect, but different research groups worldwide have obtained contradictory results depending on the material selection and the model used to determine the specific surface area and pore size distribution in carbon electrodes," Yushin said. "Neutron scattering should help us clarify existing controversies. We have already observed that depending on the solvent-pore wall interactions, either enhanced or reduced ion electro-adsorption may take place in sub-nanometer pores."

In their experiments, the researchers used two different electrolytes: water containing sulfuric acid and deuterium oxide - also known as heavy water - which also contained sulfuric acid. The two were chosen for the proof-of-concept experiments, though a wide range of other hydrogen-containing electrolytes could also be used.

Now that the technique has been shown to work, Yushin would like to expand the experimentation to develop better fundamental understanding about the complex interactions of solvent, ions and pore walls under applied potential. That could allow development of a model that could guide the design of future systems that depend on ion transport and adsorption.

"Once you gain the fundamental knowledge from SANS experiments, predictive theoretical models could be developed that would guide the synthesis of the optimal structures for these applications," he said. "Once you clearly understand the structure-property relationships, you can use materials science approaches to design and synthesize the optimal material with the desired properties."

Information developed through the research could lead to improvements in supercapacitors and hybrid battery-capacitor devices for rapidly growing applications in hybrid electrical vehicles, energy efficient industrial equipment, smart grid-distributed energy storage, hybrid-electric and electrical ships, high-power energy storage for wind power and uninterruptible power supplies.

This research was partially supported by the Georgia Institute of Technology and the U.S. Army Research Office under contract number W911NF-12-1-0259. The research at ORNL's High Flux Isotope Reactor was sponsored by the Laboratory Directed Research and Development Program and the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The conclusions are those of the authors and do not necessarily reflect the official positions of the U.S. Army Research Office or the Department of Energy.

####

For more information, please click here

Contacts:
Research News
Georgia Institute of Technology
177 North Avenue
Atlanta, Georgia 30332-0181

John Toon
404-894-6986

Copyright © Georgia Institute of Technology

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

CITATION: Boukhalfa, S., et al., “Small-Angle Neutron Scattering for In Situ Probing of Ion Adsorption Inside Micropores.” Angew. Chem. Int. Ed (2013):

Related News Press

News and information

Surfing a wake of light: Researchers observe and control light wakes for the first time July 6th, 2015

Tel Aviv/Tsinghua University project uses crowd computing to improve water filtration: The research, a product of the new TAU-Tsinghua XIN Center, was conducted by 150,000 volunteers at IBM's World Community Grid July 6th, 2015

Transition from 3 to 2 dimensions increases conduction, MIPT scientists discover July 6th, 2015

A Stretchy Mesh Heater for Sore Muscles July 6th, 2015

Chemistry

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

Carnegie Mellon chemists characterize 3-D macroporous hydrogels: Methods will allow researchers to develop new 'smart' materials June 30th, 2015

Laboratories

Influential Interfaces Lead to Advances in Organic Spintronics July 1st, 2015

NIST ‘How-To’ Website Documents Procedures for Nano-EHS Research and Testing July 1st, 2015

Ultra-stable JILA microscopy technique tracks tiny objects for hours July 1st, 2015

Marine/Watercraft

Enhanced Graphene Components for Next Generation Racing Yacht March 5th, 2015

BRAAVOO will design an unmanned surveying vessel and marine buoy that carry biosensors to monitor marine pollutants November 12th, 2014

First Observation of Electronic Structure in Ag-Rh Alloy Nanoparticles Having Hydrogen Absorbing: Storage Property –Attempting to solve the mystery of why Ag-Rh alloy nanoparticles have a similar property to Pd– October 30th, 2014

Engineered proteins stick like glue — even in water: New adhesives based on mussel proteins could be useful for naval or medical applications September 22nd, 2014

Govt.-Legislation/Regulation/Funding/Policy

Surfing a wake of light: Researchers observe and control light wakes for the first time July 6th, 2015

New technology using silver may hold key to electronics advances July 2nd, 2015

NIST Group Maps Distribution of Carbon Nanotubes in Composite Materials July 2nd, 2015

Ultra-stable JILA microscopy technique tracks tiny objects for hours July 1st, 2015

Nanomedicine

A Stretchy Mesh Heater for Sore Muscles July 6th, 2015

New Biosensor Produced in Iran to Detect Effective Drugs in Cancer Treatment July 4th, 2015

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

Iranian Scientists Find Simple, Economic Method to Synthesize Antibacterial Nanoparticles July 2nd, 2015

Sensors

New Biosensor Produced in Iran to Detect Effective Drugs in Cancer Treatment July 4th, 2015

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

New micro-supercapacitor structure inspired by the intricate design of leaves: A team of scientists in Korea has devised a new method for making a graphene film for supercapacitors July 2nd, 2015

Carnegie Mellon chemists characterize 3-D macroporous hydrogels: Methods will allow researchers to develop new 'smart' materials June 30th, 2015

Discoveries

Fundamental observation of spin-controlled electrical conduction in metals: Ultrafast terahertz spectroscopy yields direct insight into the building block of modern magnetic memories July 6th, 2015

Surfing a wake of light: Researchers observe and control light wakes for the first time July 6th, 2015

Transition from 3 to 2 dimensions increases conduction, MIPT scientists discover July 6th, 2015

A Stretchy Mesh Heater for Sore Muscles July 6th, 2015

Announcements

Surfing a wake of light: Researchers observe and control light wakes for the first time July 6th, 2015

Tel Aviv/Tsinghua University project uses crowd computing to improve water filtration: The research, a product of the new TAU-Tsinghua XIN Center, was conducted by 150,000 volunteers at IBM's World Community Grid July 6th, 2015

Transition from 3 to 2 dimensions increases conduction, MIPT scientists discover July 6th, 2015

A Stretchy Mesh Heater for Sore Muscles July 6th, 2015

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Fundamental observation of spin-controlled electrical conduction in metals: Ultrafast terahertz spectroscopy yields direct insight into the building block of modern magnetic memories July 6th, 2015

Surfing a wake of light: Researchers observe and control light wakes for the first time July 6th, 2015

Tel Aviv/Tsinghua University project uses crowd computing to improve water filtration: The research, a product of the new TAU-Tsinghua XIN Center, was conducted by 150,000 volunteers at IBM's World Community Grid July 6th, 2015

Transition from 3 to 2 dimensions increases conduction, MIPT scientists discover July 6th, 2015

Tools

A 'movie' of ultrafast rotating molecules at a hundred billion per second: A quantum wave-like nature was successfully observed in rotating nitrogen molecules July 4th, 2015

Clues to inner atomic life from subtle light-emission shifts: Hyperfine structure of light absorption by short-lived cadmium atom isotopes reveals characteristics of the nucleus that matter for high precision detection methods July 3rd, 2015

Nanometrics to Announce Second Quarter Financial Results on July 23, 2015 July 2nd, 2015

Ultra-stable JILA microscopy technique tracks tiny objects for hours July 1st, 2015

Military

Surfing a wake of light: Researchers observe and control light wakes for the first time July 6th, 2015

Graphene flexes its electronic muscles: Rice-led researchers calculate electrical properties of carbon cones, other shapes June 30th, 2015

The peaks and valleys of silicon: Team of USC Viterbi School of Engineering Researchers introduce new layered semiconducting materials as silicon alternative June 27th, 2015

Opening a new route to photonics Berkeley lab researchers find way to control light in densely packed nanowaveguides June 27th, 2015

Energy

New technology using silver may hold key to electronics advances July 2nd, 2015

Visible Light-Sensitive Photocatalysts Used for Purification of Contaminated Water in Iran June 30th, 2015

June 29th, 2015

Making new materials with micro-explosions: ANU media release: Scientists have made exotic new materials by creating laser-induced micro-explosions in silicon, the common computer chip material June 29th, 2015

Water

Tel Aviv/Tsinghua University project uses crowd computing to improve water filtration: The research, a product of the new TAU-Tsinghua XIN Center, was conducted by 150,000 volunteers at IBM's World Community Grid July 6th, 2015

Visible Light-Sensitive Photocatalysts Used for Purification of Contaminated Water in Iran June 30th, 2015

Dais Analytic Unveils New Version of Aqualyte Membrane Technology: Updates to the Basis of the Company's Industry-Changing Nanotechnology Designed to Strengthen Position in Global Air, Energy, and Water Markets June 26th, 2015

Bacteria Cellulose, Natural Polymers with Applications in Various Industries Synthesized in Iran June 22nd, 2015

Automotive/Transportation

June 29th, 2015

Buckle up for fast ionic conduction June 16th, 2015

A protective shield for sensitive catalysts: Hydrogels block harmful oxygen June 15th, 2015

Slip sliding away: Graphene and diamonds prove a slippery combination June 10th, 2015

Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics/Energy storage

New micro-supercapacitor structure inspired by the intricate design of leaves: A team of scientists in Korea has devised a new method for making a graphene film for supercapacitors July 2nd, 2015

Samsung's New Graphene Technology Will Double Life Of Your Lithium-Ion Battery July 1st, 2015

June 29th, 2015

X-rays and electrons join forces to map catalytic reactions in real-time: New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions June 29th, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project