Solar power may be useful for making hydrogen to power automobiles. Car companies around the world are working on electric cars that get their electricity from hydrogen fuel cells. The technology is appealing because fuel cells have only two byproducts — water vapor and heat. In fact, Honda plans to capture some of that water vapor and use it to humidify the interior of its upcoming Clarity fuel cell car that is scheduled to go on sale later this year.
The problem is, how to get all that lovely hydrogen in a way that doesn’t damage the environment? Hydrogen is one of the most reactive elements on the periodic table. It binds with anything and everything (water, for instance, is one hydrogen atom combined with two oxygen atoms). Pure hydrogen just does not exist in nature.
Chemically, the bonds hydrogen forms with other elements are extremely strong. It takes a lot of energy to break those bonds. In some cases, it can take more energy to create hydrogen than the purified hydrogen will contain.
In the US, most hydrogen is obtained from reforming natural gas, which sounds OK until you realize that most natural gas is derived from fracking — one of the dirtiest, least environmentally friendly human activities of all.
Hydrogen is contained in abundance in biomass waste — basically whatever is left over after plants stop growing. Corn stalks, switchgrass, lawn clippings, and food waste are all forms of biomass. Scientists know how to use biomass to make hydrogen but the process requires very high temperatures which means a lot of energy has to go in to get energy out.
Scientists at the University of Cambridge in England may have found an answer, however. They have developed a technique that uses solar power to produce clean hydrogen from biomass. The new technique involves the addition of catalytic nanoparticles to alkaline water containing biomass. The solution was put in front of a lab-based light that mimics sunlight. The result was that some of the biomass was turned into hydrogen gas.
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