Hydrogen-powered fuel cells could provide efficient, reliable power for everything from buildings to autos and wireless devices. But there’s a big problem: how do you get the hydrogen in the first place?
The most common methods of producing hydrogen-separating it from steam, extracting it from methanol or biomass such as corn, or simply splitting water into oxygen and hydrogen-are expensive and make the so-called hydrogen economy seem decades away. Scientists are making progress, though, by improving the catalysts employed in many of these hydrogen-producing reactions. Common catalysts have included precious metals like gold and platinum. But researchers at the University of Wisconsin-Madison have constructed a catalyst from nickel, aluminum, and tin that could be hundreds of times less expensive and still accelerate reactions involving either methanol or biomass. “Using a nickel-based catalyst can greatly reduce costs, especially for a larger reaction,” says Randy Cortright, a member of the Wisconsin team who founded Virent Energy of Madison, WI, to commercialize the method.
Cheaper materials are just part of this cost equation. James Dumesic, head of the Wisconsin team, says finding “catalysts that are either more active or will work at lower temperatures” is another crucial step. Most commercial hydrogen today is produced in natural-gas power plants by reacting steam and methane over a catalyst at high temperatures. But cooler reactions requiring less energy could make smaller-scale hydrogen production affordable. Researchers at the Georgia Institute of Technology have developed a new process, which involves adding iron to the catalysts, that can lower the temperature of hydrogen-producing reactions-conceivably making hydrogen energy, in the long run, cheap enough that commercial buildings or homes could have their own power supplies.
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