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Someone has
asked
me recently
about how the
different
cells within the
PEM electrolyzer
stack
are connected
electrically.
In the event
where we only
have one cell,
the situation is
simple enough.
The bipolar
plates
are made out
of electrically
conductive
materials.
However, the
proton
exchange membrane
is made out of
an electrically
insulating
material as it
does not allow
the conductance
of
electrons, but
it
only allows the
conductance of
the protons.
Hence, it's
called
the proton
exchange
membrane.
It allows the
exchange of
protons.
So as the
proton is
repelled
by the positive
and attracted by
the negative, it
goes over to
the other side
of the membrane
and it then
meets with an
electron which
is
coming from the
negative, and
one electron and
one
proton will form
one hydrogen
atom.
Now we have
two cells.
The situation is
going to be
more difficult
because
once we've split
the hydrogen
atom
into one proton
and one
electron,
the electron is
going to go
off into the
electrical connections
and
the proton is
going to cross
over to the
other side.
But where does
the electron
come
from into the
cathode side of
this membrane?
Well, it will
come through
from
the next cell,
from the anode
chamber of the
next cell.
So from the
anode chamber of
the next cell,
the electron
will
go over the
bipolar plate
and it will go
back into the
cathode chamber
of this cell.
I hope that
makes sense.
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