Is it possible to store some of the electricity or energy generated from a fuel cell using capacitors?
the size of capacitor needed would be impractical and there would be safety issues if it explodes or arcs and discharges.
How can solar satellite energy be used to generate electricity?
NASA use high-efficiency Gallium-Arsenide photovoltaic arrays to generate electricity for satellites including the Space Station, Hubble telescope, spy satellites, communication satellites etc. These are about 40% efficient.
On a much larger scale such arrays could generate electricity in space, but would have to be transported back to earth perhaps in the form of a very high-energy microwave beam. The receiving station on earth would regenerate the electricity from the microwave energy.
Advantages? – zero carbon, 24/7 energy (The sun always shines in space)
Disadvantages? – the microwave beam could do serious harm if it went off-course. Also if the satellite is geo-stationary the earth’s shadow would reduce the overall energy output.