Scientists Devise Catalyst that Uses Light to Turn Carbon Dioxide to Fuel
Arthur T Knackerbracket has found the following story:
In a recent study from the U.S. Department of Energy's (DOE) Argonne National Laboratory, scientists have used sunlight and a catalyst largely made of copper to transform carbon dioxide to methanol. A liquid fuel, methanol offers the potential for industry to find an additional source to meet America's energy needs.
The study describes a photocatalyst made of cuprous oxide (Cu2O), a semiconductor that when exposed to light can produce electrons that become available to react with, or reduce, many compounds. After being excited, electrons leave a positive hole in the catalyst's lower-energy valence band that, in turn, can oxidize water.
Previous attempts to use photocatalysts, such as titanium dioxide, to reduce carbon dioxide tended to produce a whole mish-mash of various products, ranging from aldehydes to methane. The lack of selectivity of these reactions made it difficult to segregate a usable fuel stream, [Distinguished Fellow Tijana] Rajh explained.
[...] By switching from titanium dioxide to cuprous oxide, scientists developed a catalyst that not only had a more negative conduction band but that would also be dramatically more selective in terms of its products. This selectivity results not only from the chemistry of cuprous oxide but from the geometry of the catalyst itself.
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