Re: Fluidized bed electrode and carbon nanotubes


"Dieter Britz" <britz@xxxxxxxxxx> ha scritto nel messaggio
news:eu7u0l$cu7$1@xxxxxxxxxxxxxxxxxxxx
Chicco83 wrote:

Hi,

I have read on internet about fluidized bed electrode. This is constitute
by Ag metal particles (0.65 mm diameter) fluidized in the electrolyte.
I ask me: Fluidized bed electrod's performance are comparable whit the
Conventional electrodes for fuel cells?

I have another question. I have listen that carbon nanotubes have peculiar
electrochemical proprieties. May carbon nanotubes dust replace metal
particles in fluidized bed electrode for fuel cells? And for conventional
fuels cells?

Tanks all for answers.
If you want efficiency in electrolysis on a larger scale, e.g. in
electrosynthesis, you need convection. There are many ways to do that,
one of them being the fluidised bed electrode (fbe). There are
different sorts of pellets to use in these, not only Ag. A common
other type is glass beads coated with a metal. There is a central bar
of some metal to provide the charge for the floating pellets. I don't
know what yo9u regard as conventional, but the fbe is in effect a
three-dimensional electrode. You can no doubt google yourself to
the literature on it - it is almost 40 years old. The earliest paper
I have on them is by Armstrong et al 1968, and there are a couple of
patents by Backhusrst et al, '69 and '70, and a few papers on them
by Fleischmann in 1971 in JEC. You can no doubt find all these.

I would say that carbon nanotubes are not suitable for a fbe, because
they are so small that they would just go right through the cell with
the fluid. I doubt that they are any good for a packed bed electrode
either, as there would be great resistance to the fluid flow.

I mean carbon nanotubes particles, no singles molecular structure
of carbon nanotube. ;-)


.

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