December 07, 2022, 10:38:12 PM
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Topic: hypochlorous acid generator Tantalum electrode problem.  (Read 4418 times)

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Offline professor_jonny

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hypochlorous acid generator Tantalum electrode problem.
« on: June 03, 2021, 11:09:51 PM »
Hi I have created a hypochlorous acid machine from the electrolysis of salt water with a porous ceramic membrane inbetween the electrodes.

But I'm having problems with the anode being eaten the anode is made of titanium I have looked at coating this in robodum oxide as they do with comercial systems but it is extremly toxic and very expensive to handle and not an option in my country.

So I purchased a Tantalum rod for the anode which is more chemical resistant that titanium to chemicals.

When using the Tantalum rod as the annode i get no current flow but if i use it as the cathode the process works.

It is like i have creaded a diode with titanium salt water and Tantalum that oposes current flow in one direction.

With the titanium as the anode I can pull 170 amps at 48vdc but with the Tantalum as the anode i cant get any more than a few mili amps.

I have tried hydrocloric acid as a catalist but no go does any one have any idea ?

Winding the voltage up does help but it still really wont run away like with the Tantalum as the cathode.

i was guessing an oxide coating on the Tantalum but then it conducts the other way with out issue.
« Last Edit: June 03, 2021, 11:46:18 PM by professor_jonny »

Offline utelectrode

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Re: hypochlorous acid generator Tantalum electrode problem.
« Reply #1 on: March 09, 2022, 08:36:26 PM »
You may try ruthenium iridium coated titanium plate or mesh as anode, HCL as electrolyte.
UTron Technology Co.,Ltd is one of China's most established developer and manufacturer of MMO coated titanium electrodes and platinized titanium anodes. Located in Shaanxi, China, it is specializes in design and production of titanium electrodes and titanium electrolyzer for cathodic protection, electrowinning, electroplating, chlorine generation, waste water treatment and other applications.

Offline Hunter2

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Re: hypochlorous acid generator Tantalum electrode problem.
« Reply #2 on: March 10, 2022, 11:56:44 AM »
Why not use carbon rods.

Offline Enthalpy

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Re: hypochlorous acid generator Tantalum electrode problem.
« Reply #3 on: August 07, 2022, 10:41:46 AM »
Tantalum is known to grow an oxide layer until the thickness suffices to isolate, including at 200V. It's the easiest material for that purpose. It serves to make "electrochemical" capacitors.

Other such metals are aluminium (seriously pure) and more recently niobium. Aluminium tends to serve for higher voltages, up to 1000V roughly, while tantalum serves for low or very low voltages, especially as a sintered electrode. Niobium is more affordable.

Because the oxide layer is nicely thin, and the optionally electrode sintered has much area, such components offer more capacitance in a smaller volume than plastic film do, especially at low voltages.

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