POWER March 2015 - 15
cell technology. Called kraftwerk (German
for " power station " ), the charger generates
power from liquefied petroleum gas
(LPG) such as propane or butane using
commonly available recharge canisters.
Most of the palm sized-, 7-ounce unit is
taken up by the LPG fuel tank; the actual
fuel cell is smaller than a cigarette (Figure
7).
The Kickstarter project reached its
funding goal in a week, and the company
is promising to begin delivery of the
units in December 2015. According to the
company's website, the microtubular fuel
cells can also be packed into arrays for
larger capacity. It offers 250-W modules
that can be combined into stacks of up to
80 kW capacity.
-Thomas W. Overton, JD
Manufacturing
Supercapacitors from
Atmospheric Carbon
Dioxide
Researchers at Oregon State University
(OSU) have developed a method to manufacture
nanoporous graphene for use in
supercapacitors from atmospheric carbon
8. Small pores, big potential. A method for manufacturing nanoporous graphene
holds the potential for creating vastly more powerful supercapacitors. Courtesy: Oregon State
University
300
200
100
-100
-200
-300
5 mv/s
200 mv/s
500 mv/s
1,000 mv/s
2,000 mv/s
0.0 0.2 0.4 0.6 0.8 1.0
Voltage(V)
dioxide (CO2). Graphene is a form of carbon
that is essentially a one-atom-thick
layer of graphite, in which the carbon atoms
are arranged in a hexagonal lattice.
Because of its virtually two-dimensional
character, it has a variety of fascinating
chemical and physical properties. Graphene
is 100 times stronger than steel
and is an excellent conductor of heat and
electricity.
Nanoporous graphene is graphene in
which nanopores have been created in
the lattice (Figure 8). It has a very high
specific surface area, about 1,900 square
meters per gram. This gives it an electrical
conductivity at least 10 times higher
than the activated carbon currently used
to make commercial supercapacitors.
However, the method developed at OSU
to create nanoporous graphene is faster,
less expensive, and has less environmental
impact than previous methods such as
chemical etching, which often use toxic
materials. Rather than etching graphene,
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POWER March 2015
Table of Contents for the Digital Edition of POWER March 2015
Contents
POWER March 2015 - Cover1
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POWER March 2015 - Cover3
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