Author Topic: Electrolysis frequency threshold  (Read 1543 times)

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Electrolysis frequency threshold
« on: June 21, 2012, 17:30:10 pm »
Anyone did the following test?

Construct a H bridge and plot a graph of the current as function of the voltage and frequency?

Did anyone determined the lowest frequency where electrolysis still occur?

Maybe a graph of the polarization as function of the voltage? 

Thanks

I'm going to perform this...

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Re: Electrolysis frequency threshold
« Reply #1 on: June 21, 2012, 17:50:19 pm »
Uhm, well... 0hz would be a flat DC and dependent on voltage. And then we have pulsed DC which is basically switched DC. At 1hz we will have much less gas than we would with 60hz. The more cycles per second, the more gases produced. Also, there are the dimensions of the cell and cavity that will make differences with such tests.


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Re: Electrolysis frequency threshold
« Reply #2 on: June 21, 2012, 18:25:26 pm »
Right Bubz,

Sorry I wanted to mean the lowest AC frequency using an H bridge, not dc pulsed (one mosfet) because the later don't reverse the polarity so any frequency still producing the gas. 

To plot all those graphs we certainly need also to consider the internal resistance and impedance of the voltage-frequency source...


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Re: Electrolysis frequency threshold
« Reply #3 on: June 21, 2012, 20:05:56 pm »
Are you confusing a "Wheatstone bridge" with an "H bridge"? I can't understand why anyone would want to reverse polarity as the H bridge does for uses such as reverse motion in servos. An H bridge does not rectify AC signals, although, a Wheatstone bridge does. As far as how a DC pulse is created, whether it from a bridge or mosfet, the end signal is still the same. Only, one is digital(mosfet), and the other is analog(bridge).

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Re: Electrolysis frequency threshold
« Reply #4 on: June 22, 2012, 00:20:45 am »
No i mean exactly the H-bridge, i want to test the dielectric properties with ac applied since dc don't shows up the impedance stuff.


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Re: Electrolysis frequency threshold
« Reply #5 on: July 26, 2015, 13:20:50 pm »
i will do this test again with my new half bridge

you are correct its pulsed dc.. but it also shorts the cell each pulse...

may not be worth...