Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Search for future hydrogen storage materials extends to investigation of hydrogen interactions with metal nanoparticles

Figure 1: A schematic depiction of hydrogen storage of palladium (Pd) and platiunum (Pt) nanoparticles (green, hydrogen; red, Pd; blue Pt).

Reproduced with permission from Ref. 1 © 2008 by the American Chemical Society
Figure 1: A schematic depiction of hydrogen storage of palladium (Pd) and platiunum (Pt) nanoparticles (green, hydrogen; red, Pd; blue Pt).

Reproduced with permission from Ref. 1 © 2008 by the American Chemical Society

Abstract:
The environmental impact of the use of hydrocarbons as fuels has led to a global search for cleaner energy sources. Hydrogen offers a greener alternative for transportation fuels, but a critical issue is the requirement of a safe and reliable hydrogen storage medium. Nanoparticles have advantages over bulk materials for hydrogen storage applications: they have a larger solid/gas interface area and shorter hydrogen diffusion paths, yielding potentially faster kinetics for gas absorption and desorption.

Search for future hydrogen storage materials extends to investigation of hydrogen interactions with metal nanoparticles

Japan | Posted on April 26th, 2008

In two recent communications published in the Journal of the American Chemical Society, Masaki Takata from the SPring-8 Centre, Harima, and his colleagues, including Hiroshi Kitagawa from Kyushu University, explore the hydrogen absorption and desorption behavior of palladium nanoparticles and of palladium core-platinum shell nanoparticles.

In the first communication1, the researchers address whether core-shell nanoparticles made of two metals store hydrogen. The team prepared structures with crystalline palladium cores of 6 nm diameter and crystalline platinum shells of thickness around 2 nm, and then characterized them using a variety of techniques.

Pressure-composition isotherms showed that the core-shell nanoparticles absorbed the same amount of hydrogen as homogenous palladium nanoparticles. Takata, Kitagawa and colleagues then performed solid state nuclear magnetic resonance (NMR) measurements with deuterium, a hydrogen isotope, to identify the absorption site of hydrogen. Surprisingly, they have found that while deuterium was dispersed in both palladium and platinum lattices, it was concentrated in the boundary region between the core and the shell (Fig. 1).

Palladium nanoparticles do not demonstrate complete reversibility in their hydrogen uptake and release, in contrast to their bulk counterparts. Takata, Kitagawa and colleagues explored this hysteresis in their second communication2. Using x-ray diffraction, they have found that the lattice constant of palladium nanoparticles of 6 nm diameter increases with exposure to increased hydrogen pressures. However, on evacuation of the hydrogen, the lattice does not return to its original value; it remains slightly larger.

Then, again using solid state NMR measurements with deuterium, the researchers have found that some deuterium atoms remained within the palladium lattice after evacuation of ‘free' deuterium from the system. They suggest that hydrogen atoms are trapped firmly within the lattice, which expands the crystal lattice, and hence lattice constant, of palladium. This, they say, explains why hydrogen absorption in these materials is not completely reversible.

The researchers conclude that their work provides a new understanding of the interactions between hydrogen and ‘nano-structured' solids, and could contribute to the development of practical hydrogen-storage materials.
Reference

1. Kobayashi, H., Yamauchi, M., Kitagawa, H., Kubota, Y., Kato, K. & Takata, M. Hydrogen absorption in the core/shell interface of Pd/Pt nanoparticles. Journal of the American Chemical Society 130, 1818-1819 (2008).
2. Kobayashi, H., Yamauchi, M., Kitagawa, H., Kubota, Y., Kato, K. & Takata, M. On the nature of strong hydrogen atom trapping inside Pd nanoparticles. Journal of the American Chemical Society 130, 1828-1829 (2008). | article |

####

About Riken Research
RIKEN is one of Japan’s largest research organisations with institutes and centres in various locations in Japan (see http://www.riken.jp/engn/r-world/link/index.html). RIKEN’s 3000+ researchers publish several hundred research articles in top scientific and technical journals every year across a broad spectrum of disciplines in physics, chemistry, biology, medicine, earth science and in many areas of technology, and the number of articles is growing year on year.

For more information, please click here

Copyright © Riken Research

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

article 1

article 2

Related News Press

News and information

Organometallics welcomes new editor-in-chief: Paul Chirik, Ph.D. July 22nd, 2014

The Hiden EQP Plasma Diagnostic with on-board MCA July 22nd, 2014

Iran to Hold 3rd Int'l Forum on Nanotechnology Economy July 22nd, 2014

Nanometrics Announces Upcoming Investor Events July 22nd, 2014

Discoveries

Researchers create vaccine for dust-mite allergies Main Page Content: Vaccine reduced lung inflammation to allergens in lab and animal tests July 22nd, 2014

NIST shows ultrasonically propelled nanorods spin dizzyingly fast July 22nd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

NUS scientists use low cost technique to improve properties and functions of nanomaterials: By 'drawing' micropatterns on nanomaterials using a focused laser beam, scientists could modify properties of nanomaterials for effective applications in photonic and optoelectric applicat July 22nd, 2014

Announcements

Nanometrics Announces Upcoming Investor Events July 22nd, 2014

Bruker Awarded Fourth PeakForce Tapping Patent: AFM Mode Uniquely Combines Highest Resolution Imaging and Material Property Mapping July 22nd, 2014

NIST shows ultrasonically propelled nanorods spin dizzyingly fast July 22nd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

Energy

Oregon chemists eye improved thin films with metal substitution: Solution-based inorganic process could drive more efficient electronics and solar devices July 21st, 2014

Steam from the sun: New spongelike structure converts solar energy into steam July 21st, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

Nanotechnology that will impact the Security & Defense sectors to be discussed at NanoSD2014 conference July 8th, 2014

Fuel Cells

Media Advisory: Minister Rempel to Announce Support for Alberta's Nanotechnology Sector June 20th, 2014

Evolution of a Bimetallic Nanocatalyst June 6th, 2014

University of Surrey collaborates with India and Tata Steel to revolutionise renewable energy March 26th, 2014

Novel membrane reveals water molecules will bounce off a liquid surface: Study may lead to more efficient water-desalination systems, fundamental understanding of fluid flow March 16th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE