Green Car Congress  
Go to GCC Discussions forum About GCC Contact  RSS Subscribe Twitter headlines

« Genome Sequenced of Most Efficient Xylose-Fermenting Yeast; Implications for Cellulosic Ethanol Production | Main | NHTSA Requests 10-Yr Product Plan Info from Automakers for CAFE Planning »

Print this post

Argonne Researchers Develop New Concept in Nanoscale Catalyst Engineering; Could Advance Commercialization of Fuel Cells

5 March 2007

Researchers at the US Department of Energy’s Argonne National Laboratory have developed an advanced concept in nanoscale catalyst engineering that could bring polymer electrolyte membrane (PEM) fuel cells for hydrogen-powered vehicles closer to commercialization.

The Argonne researchers, Nenad Markovic and Vojislav Stamenkovic, published related results last month in Science and this month in Nature Materials on the behavior of single crystal and polycrystalline platinum alloy surfaces. The researchers discovered that the nanosegregated platinum-nickel alloy surface has unique catalytic properties, opening up important new directions for the development of active and stable practical cathode catalysts in fuel cells.

The results of their findings identify a clear trend in the behavior of extended and nanoscale surfaces of platinum-bimetallic alloy. Additionally, the techniques and concepts derived from the research program are expected to make contributions to other areas of science well beyond the focus on electrocatalysis.

Their experiments and approach sought to substantially improve and reduce platinum loading as the oxygen-reduction catalyst. The research identified a fundamental relationship in electrocatalytic trends on surfaces between the experimentally determined surface electronic structure (the d-band center) and activity for the oxygen-reduction reaction. This relationship exhibits “volcano-type” behavior, where the maximum catalytic activity is governed by a balance between adsorption energies of reactive intermediates and surface coverage by spectator (blocking) species.

The electrocatalytic trends established for extended surfaces explain the activity pattern of nanocatalysts and provide a fundamental basis for the enhancement of cathode catalysts. By combining experiments with simulations in the quest for surfaces with desired activity, the researchers developed an advanced concept in nanoscale catalyst engineering.

In the past, theoretical connections have been suggested between electronic behavior and catalytic activity. Our work represents the first time that the connections have been identified experimentally. For us, this development constitutes the beginning of more breakthrough advances in nanocatalysts.

—Nenad Markovic

Our study demonstrates the potential of new analytical tools for characterizing nanoscale surfaces in order to fine tune their properties in a desired direction. We have identified a cathode surface that is capable of achieving and even exceeding the target for catalytic activity with improved stability. This discovery sets a new bar for catalytic activity of the cathodic reaction in fuel cells.

—Vojislav Stamenkovic

Collaborators on the research were Bongjin Mun and Philip Ross at DOE’s Lawrence Berkeley National Laboratory, Matthias Arenz and Karl Mayrhofer from Technical University of Munich, Christopher Lucas from the University of Liverpool and Guofeng Wang from the University of South Carolina.

This research was funded by DOE’s Office of Basic Energy Sciences and by General Motors.

Resources:

March 5, 2007 in Catalysts, Fuel Cells, Nanotech | Permalink | Comments (1) | TrackBack (0)

TrackBack

TrackBack URL for this entry:
http://www.typepad.com/services/trackback/6a00d8341c4fbe53ef00d8357547fa69e2

Listed below are links to weblogs that reference Argonne Researchers Develop New Concept in Nanoscale Catalyst Engineering; Could Advance Commercialization of Fuel Cells:

Comments

Since DME has an advantage of decomposition at lower temperature than methane and LPG, R&D for hydrogen source for fuel cell has been carried out.

If you would like to know more on the latest DME developments, join us at upcoming North Asia DME / Methanol conference in Beijing, 27-28 June 2007, St Regis Hotel. The conference covers key areas which include:


DME productivity can be much higher especially if
country energy policies makes an effort comparable to
that invested in increasing supply.
By:
National Development Reform Commission NDRC
Ministry of Energy for Mongolia

Production of DME/ Methanol through biomass
gasification could potentially be commercialized
By:
Shandong University completed Pilot plant in Jinan and
will be sharing their experience.

Advances in conversion technologies are readily
available and offer exciting potential of DME as a
chemical feedstock
By: Kogas, Lurgi and Haldor Topsoe

Available project finance supports the investments
that DME/ Methanol can play a large energy supply role
By: International Finance Corporation

For more information: www.iceorganiser.com

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Green Car Congress © 2013 BioAge Group, LLC. All Rights Reserved. | Home | BioAge Group