Soda can metal may solve hydrogen fuel cell problem

Manganese is known for making stainless steel and aluminum soda cans.

Now, researchers say the metal could advance one of the most promising sources of renewable energy: hydrogen fuel cells.

As reported in Nature Catalysis, the discovery could eventually help solve hydrogen fuel cells’ most frustrating problem:

They’re not affordable because most catalysts are made with platinum, which is both rare and expensive.

“We haven’t been able to advance a large-scale hydrogen economy because of this issue involving catalysts,” says lead author Gang Wu, associate professor of chemical and biological engineering at the University at Buffalo.

“But manganese is one of the most common elements in Earth’s crust and it’s widely distributed across the planet. It could finally address this problem,” Wu says.

For more than a decade, Wu has been searching for alternative catalysts for hydrogen fuel cells. He has reported advancements in iron- and cobalt-based catalysts; however, each wears down over time, limiting their usefulness, he says.

In previous work, Wu discovered that adding nitrogen to manganese causes internal changes to the metal that makes it a more stable element.

In experiments reported in the study, he devised a relatively simple two-step method of adding carbon and a form of nitrogen called tetranitrogen to manganese.

The result was a catalyst that’s comparable in its ability to split water—the reaction needed to produce hydrogen—as platinum and other metal-based alternatives.

More importantly, the stability of the catalyst makes it potentially suitable for hydrogen fuel cells. This could lead to wide-scale adoption of the technology in buses, cars, and other modes of transportation, as well as backup generators and other sources of power.

Wu plans to continue the research, focusing on improving the catalyst’s carbon microstructure and the method in which nitrogen is added. The goal, he says, is to further enhance the catalyst’s performance in practical hydrogen fuel cells.

Additional authors are from Oak Ridge National Laboratory, Brookhaven National Laboratory, Argonne National Laboratory, Oregon State University, the University of Pittsburgh, the University of South Carolina, Giner Inc., and the Harbin Institute of Technology.

The UB RENEW Institute, the US National Science Foundation, and the US Department of Energy funded the work.

Written by Cory Nealon.

Source: University at Buffalo.