MIT just announced what may be one of the most important breakthroughs of all time in the field of alternative energy. They have demonstrated how to use solar power to split water into hydrogen and oxygen to be stored inside a fuel cell:
Inspired by the photosynthesis performed by plants, Nocera and Matthew Kanan, a postdoctoral fellow in Nocera’s lab, have developed an unprecedented process that will allow the sun’s energy to be used to split water into hydrogen and oxygen gases. Later, the oxygen and hydrogen may be recombined inside a fuel cell, creating carbon-free electricity to power your house or your electric car, day or night.
The key component in Nocera and Kanan’s new process is a new catalyst that produces oxygen gas from water; another catalyst produces valuable hydrogen gas. The new catalyst consists of cobalt metal, phosphate and an electrode, placed in water. When electricity — whether from a photovoltaic cell, a wind turbine or any other source — runs through the electrode, the cobalt and phosphate form a thin film on the electrode, and oxygen gas is produced.
Combined with another catalyst, such as platinum, that can produce hydrogen gas from water, the system can duplicate the water splitting reaction that occurs during photosynthesis.
This process (known as electrolysis) is normally very expensive and thus is not useful for home storage of solar energy. If this pans out, Al Gore’s vision will become a reality. It is now distinctly possible that within 10 years time all residential electricity in the U.S. could be generated using this method. If our cars were all electric or electric/solar fuel hybrids (totally speculating on that latter part), there’s the other part of the equation.
Check out the video on MIT TechTV.
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