There
are still many scientific and engineering challenges that
need to be addressed before a true sustainable hydrogen economy can
be realized. Three of these challenges include sustainable hydrogen
generation without CO2 emissions, effective storage of
this hydrogen for specific applications, and expanding the limited
existing hydrogen infrastructure. Here we demonstrate (i) the fabrication
of hierarchical bulk nanoporous aluminum with the coexistence of macroscopic
and mesoscopic ligament/pore structures, with the mesoscopic ligaments
in the range of 10–20 nm; (ii) the use of this aluminum to
produce hydrogen on-site with a yield of ∼52–90% by
hydrolysis with “pure” water, without incorporation
of any catalyst or reaction promoter in the aluminum-water system;
and (iii) the combustion of this aluminum in air under ambient conditions,
which implies that this material could be attractive as a combustion
fuel catalyst, e.g., to enhance the ignition and combustion of solid
propellants. The inclusion of secondary aluminum or carbon-free primary
aluminum in our process will make it possible to produce hydrogen
with reduced carbon footprint for on-site and on-board applications
using only nanoporous aluminum and water.
The finding of more than trace amounts of free fluid in the absence of solid organ injury in BAT is often associated with clinically significant visceral injury. Early laparotomy is recommended for these patients.
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