Solar engine, like in sci-fi

Read here, where they describe the Johnson Thermoelectric Energy Conversion System.



(and a nice article about it is here)

The explanation goes a bit like this:
''
The JTEC is an all solid-state engine that operates on the Ericsson cycle. Equivalent to Carnot, the Ericsson cycle offers the maximum theoretical efficiency available from an engine operating between two temperatures. The JTEC system utilizes the electro-chemical potential of hydrogen pressure applied across a proton conductive membrane (PCM). The membrane and a pair of electrodes form a Membrane Electrode Assembly (MEA) similar to those used in fuel cells. On the high-pressure side of the MEA, hydrogen gas is oxidized resulting in the creation of protons and electrons. The pressure differential forces protons through the membrane causing the electrodes to conduct electrons through an external load. On the low-pressure side, the protons are reduced with the electrons to reform hydrogen gas. This process can also operate in reverse. If current is passed through the MEA a low-pressure gas can be "pumped" to a higher pressure.
''

Gulp! And the impications are:
''The invention could lead to electricity generators ranging in size from the very large, such as those used by utility companies, to the very small -- such as those that tap body heat to generate power for personal electronics.

Because the conversion rate is so high, the technology could make solar energy cheap enough to compete with fossil fuels. ''