A High Energy Density Material for Safe Energy Storage, Transport and Splitting Water to Make Hydrogen on Demand
Friday November 21, 2008
PHYS 203
Jerry Woodall
Purdue ECE
In 1968, a team lead by the author discovered that liquid gallium
saturated with aluminum at room temperature would split water into
hydrogen gas, alumina and heat. More recently his current team has
discovered that bulk, solid Al rich alloys will also split water in
the same manner. Since 1) the energy density of Al via the water
splitting reaction is 8.6 kW-hr/kg (as hydrogen plus heat), 2) Al is
plentiful both as 400 billion kg of scrap metal lying on the planet's
surface and is currently produced in large quantities at world-wide
foundries via the electrolysis of alumina, 3) the small
concentrations of the Ga or (Ga,Sn,In) in the Al alloy are inert and
totally recoverable, simple calculations show that Al rich alloys
could be an economically viable enabler for a potable large scale
hydrogen economy. This presentation will focus on our current
research aimed at understanding how and why our bulk alloys work. We
will also, discuss some of the more sensible applications for this
technology.