Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

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

Roll up your screen and stow it away? Tel Aviv University researchers develop molecular backbone of super-slim, bendable digital displays March 30th, 2015

Princess Margaret scientists convert microbubbles to nanoparticles: Harnessing light to advance tumor imaging, provide platform for targeted treatment March 30th, 2015

Wrapping carbon nanotubes in polymers enhances their performance: Scientists at Japan's Kyushu University say polymer-wrapped carbon nanotubes hold much promise in biotechnology and energy applications March 30th, 2015

Tokyo Institute of Technology research: Catalyst redefines rate limitations in ammonia production March 30th, 2015

Discoveries

Roll up your screen and stow it away? Tel Aviv University researchers develop molecular backbone of super-slim, bendable digital displays March 30th, 2015

Princess Margaret scientists convert microbubbles to nanoparticles: Harnessing light to advance tumor imaging, provide platform for targeted treatment March 30th, 2015

Wrapping carbon nanotubes in polymers enhances their performance: Scientists at Japan's Kyushu University say polymer-wrapped carbon nanotubes hold much promise in biotechnology and energy applications March 30th, 2015

Next important step toward quantum computer: Scientists at the University of Bonn have succeeded in linking 2 different quantum systems March 30th, 2015

Announcements

Princess Margaret scientists convert microbubbles to nanoparticles: Harnessing light to advance tumor imaging, provide platform for targeted treatment March 30th, 2015

Wrapping carbon nanotubes in polymers enhances their performance: Scientists at Japan's Kyushu University say polymer-wrapped carbon nanotubes hold much promise in biotechnology and energy applications March 30th, 2015

Tokyo Institute of Technology research: Catalyst redefines rate limitations in ammonia production March 30th, 2015

Next important step toward quantum computer: Scientists at the University of Bonn have succeeded in linking 2 different quantum systems March 30th, 2015

Energy

Wrapping carbon nanotubes in polymers enhances their performance: Scientists at Japan's Kyushu University say polymer-wrapped carbon nanotubes hold much promise in biotechnology and energy applications March 30th, 2015

Solving molybdenum disulfide's 'thin' problem: Research team increases material's light emission by twelve times March 29th, 2015

LAMDAMAP 2015 hosted by the University March 26th, 2015

SUNY Poly & M+W Make Major Announcement: Major Expansion To Include M+W Owned Gehrlicher Solar America Corporation That Will Create up to 400 Jobs to Develop Solar Power Plants at SUNY Poly Sites Across New York State March 26th, 2015

Fuel Cells

Graphene 'gateway' discovery opens possibilities for improved energy technologies March 18th, 2015

Imperfect graphene opens door to better fuel cells: Membrane could lead to fast-charging batteries for transportation March 18th, 2015

Graphene membrane could lead to better fuel cells, water filters March 17th, 2015

CiQUS researchers obtain high-quality perovskites over large areas by a chemical method March 4th, 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







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE