Make Manganese Dioxide Electrodes (for chlorate or HHO cells)

How to make Manganese Dioxide Electrodes that can be used for chlorate cells or HHO cells and a few other electrochemical processes requiring inert anodes in oxidizing solutions.

Make the electrode is fairly simple. First a titanium strip is sanded to give a clean surface and then etched with hydrochloric acid to activate it. Cobalt nitrate solution is applied in a thin layer and then heated to 300 Celsius to decompose (pyrolyze) the cobalt nitrate into cobalt oxide. the loosely adhering cobalt oxide is washed off and then new layers of cobalt oxide are applied. Usually between 3 to 10 layers.

Then manganese nitrate is applied and the process repeated to make manganese dioxide. Another 10 to 50 layers may be applied.

Optionally, a further layer of manganese nitrate by electrolysis may be applied by using the electrode as an anode in a solution of 90 grams manganese sulfate, 500mL water and 12mL concentrated sulfuric acid. Copper or titanium is used as the cathode and a current density of about 10ma per square centimeter is used. A short run time of a few minutes or so puts a thin layer of manganese dioxide on the surface that seems to reduce permanganate production, but does not eliminate it.

In the future i'll be working on a lead dioxide electrode.

Category:

Science & Technology

Tags:

• cobalt
• Manganese
• nitrate
• synthesis
• sulfate
• chemistry
• electrodes
• science
• hho
• chlorate
• perchlorate
• electrochemistry
• cell
• electrolysis
• anode
• cathode
• electrolyte

[iceman8o8o]

I have no idea what he is talking about but it is still fun to watch

[crapbag1997]

i' thinking of making a sodium chlorate cell and this would be perfect but does any one knoe if i can use other metasls than titanium

[DjKillerboss]

@Narutopuneet you can coat PbO2 directly or MnO2 directly.. much more possible.. why don't u make it flat with a press or a hammer? than u can coat it with cobalt nitrate..

[Narutopuneet]

@DjKillerboss tell which substances can be coated on graphite electrode and how to coat them . i am having titanium thick wire of diameter 4mm and also having cobalt nitrate but i cannot properly coat it with cobalt oxide since it is cylindrical in shape. and cobalt nitrate slips from it and does not decompose on it

[DjKillerboss]

@Narutopuneet I don't think so. but why dont use graphit-elektrodes (very cheap) and coat it with everything u want?

[Narutopuneet]

can cobalt oxide be coated on titanium by doing electrolysis of bobalt nitrate or cobalt sulphate as you did for mangnese dioxide

[DjKillerboss]

Hey, i found something out, if u hold the conzentration of H2SO4 under about 5g/L u get better Electrodes. nutralize the building H2SO4 with MnO2--> better electroplating on the substrate u want to plate..

[DjKillerboss]

yes i got it. i made a good PbO2 anode in a testrun xD but it is only 6 cm long cause of the testrun o_O

[tjpld]

@crapbag1997 This might be interesting for you. Simply reassemble the link.

h t t p : / / w w w . oxidizing.110mb . co m/ chlorate/ chlorate. html

[tjpld]

Haven't heard of anyone making a good PbO2 Anodes but still it is seen as the Holy Grail of Anodes for Perchlorate Cells since you can oxidize from KCL directly to KClO4.

[DjKillerboss]

Hy NurdRage, i also experiment to make a PbO2 Elektrode atm.. My best elektrode last at least 6-7 hour, but than i was dead.. did u made a PbO2 that didnt has this problem? sry for my english but i dont need it much...

[Jrd8436]

Top comment is me pretty please I want to be top comment