Featured Research

from universities, journals, and other organizations

'Ordered' catalyst boosts fuel cell output at lower cost

Date:
October 30, 2012
Source:
Cornell University
Summary:
Fuel cells, which convert fuel directly into electricity without burning it, promise a less polluted future where cars run on pure hydrogen and exhaust nothing but water vapor. But the catalysts that make them work are still "sluggish" and worse, expensive. A research team has taken an important step forward with a chemical process that creates platinum-cobalt nanoparticles with a platinum enriched shell that show improved catalytic activity.

Electron microscope image of a platinum-cobalt alloy nanoparticle, showing the arrangement of the metal atoms into an ordered lattice. A smaller particle overlaps the large one at the bottom. Yellow arrows indicate the three layers of platinum atoms on the surface.
Credit: Image courtesy of Cornell University

Fuel cells, which convert fuel directly into electricity without burning it, promise a less polluted future where cars run on pure hydrogen and exhaust nothing but water vapor. But the catalysts that make them work are still "sluggish" and worse, expensive.

Related Articles


A research team at the Cornell Energy Materials Center has taken an important step forward with a chemical process that creates platinum-cobalt nanoparticles with a platinum enriched shell that show improved catalytic activity. "This could be a real significant improvement. It enhances the catalysis and cuts down the cost by a factor of five," said Héctor Abruña, the E.M. Chamot Professor of Chemistry and Chemical Biology, senior author of a paper describing the work in the Oct. 28 issue of the journal Nature Materials. Co-authors include Francis DiSalvo, the John Newman Professor of Chemistry and Chemical Biology, and David Muller, professor of applied and engineering physics and co-director of the Kavli Institute at Cornell for Nanoscale Science.

In a hydrogen fuel cell, a catalyst at one electrode breaks hydrogen atoms into their component protons and electrons. The electrons travel through an external circuit to create an electric current to the other electrode, where a second catalyst combines the incoming electrons, free protons and oxygen to form water. In current commercial fuel cells, that catalyst is pure platinum, which is scarce and expensive. Researchers have tried substituting platinum alloys with varying degrees of success. Previously, the Cornell research team created nanoparticles of a palladium-cobalt alloy coated with a thin layer of platinum that worked like pure platinum at lower cost. Forming the catalyst as nanoparticles -- typically about 5 nanometers in diameter and distributed on a carbon support -- provides more surface area to react with the fuel.

Computer simulations of the catalytic reaction predicted that there should be an increase in catalytic activity if the platinum atoms are pushed a bit together or "strained," as Abruña describes it. Deli Wang, a post-doctoral researcher in Abruña's group, devised a new chemical process to manufacture nanoparticles of a platinum-cobalt alloy that included an annealing (heating) step, where the randomly distributed atoms in the alloy form an orderly crystal structure. Rather than just being jumbled together, the metal atoms arrange themselves in an orderly lattice. Platinum atoms layered onto these particles line up with the lattice and are pushed closer together than they would be in pure platinum, with the resulting "strain" enhancing the catalytic activity. Huolin Xin, a graduate student in Muller's group, used a scanning tunneling electron microscope to confirm the structure.

In preliminary tests the new nanoparticles to showed about three and a half times higher catalytic activity (measured by current flow) than similar particles with a disordered core, and more than 12 times more than pure platinum. The new catalysts also are more durable. Fuel cell catalysts lose their effectiveness as platinum atoms are oxidized away or as nanoparticles clump together, deceasing the surface area they can offer to react with fuel. After 5,000 on-off cycles of a test cell, catalytic activity of the ordered nanoparticles remained steady, while that of similar cobalt-platinum nanoparticles with a disordered core rapidly fell off. The ordered structure is more stable, Abruña said. The platinum skin may be bonded more strongly to the ordered core than to the disordered alloy, so it would be less likely to fuse with the platinum on other nanoparticles to cause clumping. "We have not gone beyond 5,000 cycles but the results up to that point look very, very good," he said.

The Energy Materials Center at Cornell is an Energy Frontier Research Center funded by the U.S. Department of Energy.


Story Source:

The above story is based on materials provided by Cornell University. The original article was written by Bill Steele. Note: Materials may be edited for content and length.


Journal Reference:

  1. Deli Wang, Huolin L. Xin, Robert Hovden, Hongsen Wang, Yingchao Yu, David A. Muller, Francis J. DiSalvo, Héctor D. Abruña. Structurally ordered intermetallic platinum–cobalt core–shell nanoparticles with enhanced activity and stability as oxygen reduction electrocatalysts. Nature Materials, 2012; DOI: 10.1038/nmat3458

Cite This Page:

Cornell University. "'Ordered' catalyst boosts fuel cell output at lower cost." ScienceDaily. ScienceDaily, 30 October 2012. <www.sciencedaily.com/releases/2012/10/121030173216.htm>.
Cornell University. (2012, October 30). 'Ordered' catalyst boosts fuel cell output at lower cost. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2012/10/121030173216.htm
Cornell University. "'Ordered' catalyst boosts fuel cell output at lower cost." ScienceDaily. www.sciencedaily.com/releases/2012/10/121030173216.htm (accessed December 21, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, December 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) — Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) — What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) — A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) — The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins