Question:
Currently, there are three efficient electrolysis processes (
http://www.geocities.com/TheTropics/Island/4175/tor12.htm )
that can produce H2 from water, i.e. alkaline water electrolysis, high
temperature water vapour electrolysis and solid polymer electrolyte water
electrolysis.
How does Watervapour Electrolysis work?
Answer:
It is basically a solid oxide fuel cell in reverse. The electrolyte is
an ionically conducting ceramic oxide, typically yttria doped zirconia.
The advantage of working at high temperatures (500 to 1000C) is that the
water decomposition starts at a lower voltage so there is potential for
greater efficiency. Real units still cost a fortune which is why the
underlying theme in the link you give makes me sad. It seems to me they
are just looking for an excuse to build dams to destroy more forest, put
the country into debt and get rich off the loan repayments.
