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Interesting article shows why 2V is ideal..
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CheezWiz Offline
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Post: #1
Interesting article shows why 2V is ideal..
This is from an article in the Journal of Applied Electrochemistry.

While the article deals with electrolysis of water for H2 production, the experiment demonstrates some of the principles for us. Treat their apparatus as a single cell of a smacks and note the efficiency of a single cell at a specific voltage..

I can provide the article to those interested. Just PM me.

A novel method of hydrogen generation by water electrolysis using
an ultra-short-pulse power supply

Abstract
A novel method of hydrogen generation by water electrolysis using ultra-short-pulse power supply is demonstrated.
The ultra-short power supply consists of a static induction thyristor (SI[/b]Thy) and a specific circuit which is called the
inductive energy storage (IES) circuit. It was found that by using an ultra-short pulse with the width of 300 ns,
electrolysis takes place with a mechanism dominated by electron transfer, which is different from the conventional
diffusion limiting process in DC electrolysis.


In order to examine the possibility of water electrolysis
by ultra-short pulses, 3.4 l of 1 M KOH solution were
put in an electrolysis bath. 3.39 cm2 platinum plates
were used as the anode and cathode. The distance
between electrodes was set as 3 cm. The solution
temperature was kept at 293±2 K during the experiment.
A conventional DC power supply and an ultrashort
pulse power supply were used for comparison.


Principle
In the conventional DC electrolysis of water, hydrogen
is generated as a result of electron transfer from the
cathode electrode to adsorbed hydrogen ions on the
electrode surface. This electrolysis occurs when the
applied voltage between the anode and the cathode
exceeds the water decomposition voltage of about 1.6 V,
the sum of the theoretical decomposition voltage of
1.23 V at room temperature and the overvoltage of
about 0.4 V depending on electrode materials and other
factors [1]. DC electrolysis is a diffusion limited process
and the current flow in water is determined by the
diffusion coefficient of ions. It is therefore difficult to
increase the input power for a constant volume electrochemical
cell without reduction in electrolysis efficiency.


Citation:
Journal of Applied Electrochemistry (2006) 36:419–423


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(This post was last modified: 07-14-2008 07:14 PM by CheezWiz.)
07-14-2008 06:47 PM
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tesla Offline
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RE: Interesting article shows why 2V is ideal..
Yeah, I knew that LOL

Electricity is amazing stuff...how you can have pulsed DC and not call it AC confuses me, unless "AC" undergoes polarity reversal between the pulses.

That experiment sounds somewhat like what Meyers was doing.

...same thing we do every night Pinky, plan to take over the world!
07-24-2008 08:02 AM
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Atfab Offline
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RE: Interesting article shows why 2V is ideal..
tesla Wrote:Yeah, I knew that LOL

Electricity is amazing stuff...how you can have pulsed DC and not call it AC confuses me, unless "AC" undergoes polarity reversal between the pulses.

With a handle of Tesla, I would hope you would know. It was Tesla that won out over Edison to distribute electric power to homes as AC instead of DC. Just one of very few things Edison got wrong.

Now I have to run all that metric data thru my converter. Then hope that platinum didn't fudge the data.

Atfab
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07-24-2008 12:35 PM
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Atfab Offline
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RE: Interesting article shows why 2V is ideal..
OK because the size of the plates and the electrolite concentration are not clear to me, I did not calculate them but the graphs are interesting.

Temp = 67.72 degF, maintained at less than +/- 1 deg.

Spacing = Two plates @ 1.2"

The best production rate was at 12.6v @ 20a, DC, no pulse.

The best efficiency was at 7.9v @ 1.2a, @ 17khz pulsed.

Atfab
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07-24-2008 01:28 PM
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tesla Offline
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RE: Interesting article shows why 2V is ideal..
Methinks the pulsing is inducing a physical effect, I postulate this may due to the greater efficiency because both the voltage AND amperage are lower. There may be some unknown process that occurs because of the pulsing...think of what my namesake used to illustrate: Pushing someone in a swing takes an initial burst of effort, but each successive push requires less effort while yet generating more "swing"

Just remember, it don't mean a thing if it ain't got that swing!

...same thing we do every night Pinky, plan to take over the world!
07-24-2008 03:31 PM
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Atfab Offline
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RE: Interesting article shows why 2V is ideal..
Yes, me thinks that also. Aside from limiting the amps. I (and many brighter folks than me) believe that exciting the H20 with frequency may assist the the brake down of the molecules.

The wierd thing is the frequency. This would be expected with a freq at 42.8 Khz (H2O) or at some harmonic(s) of it. Of course every cell has a resonant freq of it's own also. Some interactions here?

Also note the max efficiency of both, only 6-7 % apart.

Looks like the old 8 plate, series cell @ 14v, 20 Amps is still alive. If not at that spacing.

Atfab
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07-24-2008 07:36 PM
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