Energy production and storage using nanotechnology

[Ubertino]

Researchers claim fuel cell breakthrough

[For the record!]

Published: March. 22, 2011 at 6:29 PM

CLEVELAND, March 22 (UPI) -- U.S. researchers say they've made a breakthrough in the development of low-cost hydrogen fuel cells that one day could power electric cars.

Researchers at Case Western Reserve University in Cleveland say catalysts made of carbon nanotubes dipped in a polymer solution can outperform traditional platinum catalysts in fuel cells at a fraction of the cost.

The scientists say the new technology can remove one of the biggest roadblocks to widespread cell use: the cost of the catalysts.

Platinum, which represents at least a quarter of the cost of fuel cells, currently sells for about $30,000 per pound, while the activated carbon nanotubes cost about $45 per pound, a Case release said Tuesday.

"This is a breakthrough," Liming Dai, a professor of chemical engineering and the research team leader, said.

Soaking carbon nanotubes in a water solution of the polymer for a couple of hours coats the nanotube surface and pulls an electron partially from the carbon, creating a net positive charge, researchers said.

When placed on the cathode of an alkaline fuel cell, the charged material acts as a catalyst for the oxygen-reduction reaction that produces electricity by electrochemically combining hydrogen and oxygen.

In testing, the researchers' carbon catalyst fuel cell produced as much power as an identical cell using a platinum catalyst.

Dai said he's confident his lab can increase the energy output of the new process.

"We have not optimized the system yet," he said.

One widely researched use for such cells would be to produce electricity to power an electric car, using hydrogen and oxygen from the air. The only emission from such a vehicle, researchers say, would be water.

http://www.upi.com/Science_News/2011/03/22/Researchers-claim-fuel-cell-breakthrough/UPI-73011300832974/

Cheap Catalyst Made Easy

ScienceDaily (Mar. 22, 2011) — Catalysts made of carbon nanotubes dipped in a polymer solution equal the energy output and otherwise outperform platinum catalysts in fuel cells, a team of Case Western Reserve University engineers has found.

The researchers are certain that they'll be able to boost the power output and maintain the other advantages by matching the best nanotube layout and type of polymer.

But already they've proved the simple technique can knock down one of the major roadblocks to fuel cell use: cost.

Platinum, which represents at least a quarter of the cost of fuel cells, currently sells for about $65,000 per kilogram. These researchers say their activated carbon nanotubes cost about $100 per kilogram.

Their work is published in the online edition of Journal of the American Chemical Society.

"This is a breakthrough," said Liming Dai, a professor of chemical engineering and the research team leader.

Dai and research associates Shuangyin Wang and Dingshan Yu found that by simply soaking carbon nanotubes in a water solution of the polymer polydiallyldimethylammoniumn chloride for a couple of hours, the polymer coats the nanotube surface and pulls an electron partially from the carbon, creating a net positive charge.

They placed the nanotubes on the cathode of an alkaline fuel cell. There, the charged material acts as a catalyst for the oxygen-reduction reaction that produces electricity while electrochemically combining hydrogen and oxygen.

In testing, the fuel cell produced as much power as an identical cell using a platinum catalyst.

But the activated nanotubes last longer and are more stable, the researchers said. Unlike platinum, the carbon-based catalyst: doesn't lose catalytic activity and, therefore, efficiency, over time; isn't fouled by carbon monooxide poising; and is free from the crossover effect with methanol. Methanol, a liquid fuel that's easier to store and transport than hydrogen, reduces activity of a platinum catalyst when the fuel crosses over from the anode to the cathode in a fuel cell.

The new process builds on the Dai lab's earlier work using nitrogen-doped carbon nanotubes as a catalyst. In that process, nitrogen, which was chemically bonded to the carbon, pulled electron partially from the carbon to create a charge. Testing showed the doped tubes tripled the energy output of platinum.

Dai said the new process is far simpler and cheaper than using nitrogen-doped carbon nanotubes and he's confident his lab will increase the energy output as well. "We have not optimized the system yet."

Story Source:

The above story is reprinted (with editorial adaptations by ScienceDaily staff) from materials provided by Case Western Reserve University, via EurekAlert!, a service of AAAS.

Journal Reference:

Shuangyin Wang, Dingshan Yu, Liming Dai. Polyelectrolyte Functionalized Carbon Nanotubes as Efficient Metal-free Electrocatalysts for Oxygen Reduction. Journal of the American Chemical Society, 2011; : 110317101957076 DOI: 10.1021/ja1112904 [ http://dx.doi.org/10.1021/ja1112904 ]

http://www.sciencedaily.com/releases/2011/03/110322151252.htm