Chemists have made the capacitors out of bricks

Chemists
of the United States turned red
brick in
substrate
capacitor
based on conductive polymer PEDOT.
Substrate such
you need a capacitor
to have a high specific surface area
and contain iron (III),
which
need for oxidative polymerization
PEDOT

brick combines both these properties, except
it is durable, cheap and stable at
high temperatures.
The capacitor on the basis of the new material
withstood 10,000 recharge cycles, saving
90 percent of its capacity. Results
research published
in the journal Nature
Communications.

Annealed
the red brick people know how to make
for more than five thousand years — the oldest specimens discovered
in China and refer to the period
Neolithic times. Such
the bricks
made from clay with impurities
iron compounds are then dried and calcined,
which is dried and fired. Ready brick
has a porous structure and is
of silicon oxide SiO2,
aluminium oxide Al2O3
and
hematite α-Fe2O3
last
gives the material
reddish-brown hue.

American chemists under the leadership of
Julio D’arcy
(Julio
M. D’arcy) at the University of Washington
suggested
use red
brick
the substrate
for capacitors
from
conductive films
polymer of polietilenoksidov
(PEDOT).
In
such storage capacitors
energy is due to the Faraday
reactions in the conducting polymer and the idea
to use for
their creation brick
the substrate
on one side the unexpected, and on the other
very
logical.
Case
that
film
PEDOT
get
from the corresponding monomer 3,4
ethylenedioxythiophene (EDOT)
with
through oxidation and as an oxidizer
many operations use the connection
iron (III).
This
by the way, you must first obtain
material
with a high specific surface area,
then
apply
on its surface
iron compounds, and
then apply
the film of PEDOT.
Red
brick
porous
material with lots of iron compounds
(III)

at
fact is
ready
(and
almost free compared to
currently used materials)
the substrate
to create
similar capacitors.
In addition
this
the material is stable when Negreanu without
problems can withstand temperatures of 100-200 degrees Celsius,
which is usually carried out applying
film of PEDOT.

The authors
worked with samples of ordinary
annealed
brick with a mass fraction of hematite around
eight percent
it
cut into
small wedges,
three
times
washed
distilled
water
and
when was progulivali
temperature
160 degrees Celsius
for an hour
to completely remove traces of moisture from
since. Then the cubes were placed in a closed
the reactor, which was also
a container of concentrated hydrochloric
acid and a solution of EDOT
in
chlorobenzene and heated again to 160
degrees Celsius.
Salt
acid and EDOT
when
this temperature and slowly evaporate
deposited on the surface of porous
brick, with EDOT
turns
in the conductive polymer PEDOT.
Pair
hydrochloric acid performed in this
the process has two functions — first
they help to hydrolyze
hematite Fe2O3,
turning
it more
reactive
oxyhydroxide
iron FeOOH,
second

accelerate the process of oxidative
polymerization
EDOT.

After
14
hours
reaction brick
bar
fully
changed
color, becoming dark blue, almost black
for
the expense of the PEDOT layer,
after
this reaction was stopped, the bars
was washed with excess methanol to
to remove unreacted EDOT
and
dried. Thickness
the polymer coating depended
the concentration of EDOT
and
the time of synthesis, the authors were able to achieve
maximum
thickness
layer
PEDOT
in
400 micrometers, the length of one
polymer
fiber
was an average of 30 micrometers, and the diameter
— 190 nanometers.

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