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A lot of reactions and interactions can be going on in these cells :lol:
A cells electro chemical reactions can get complicated.

Especially when we start oxidizing metals or splitting electrolytes or salts of metals or bases...

Even without membranes in the cells the two sides of our cell can form a different pH around there specific electrode as the Anions and Cations migrate toward the different electrodes they are attracted towards.

Gases being formed can react with metals.
Oxidation and reduction reactions taking place, can also change properties of the cell.
Current density or even temperatures can have effects or even make changes in the cells properties (making gases escape that may not otherwise under different conditions) or change the cells or electrolytes properties of the cell or even its pH.

How ,much voltage from the power supply to the cell, or current depending on the type of cell (or battery{multiple cells}) can also affect how much gases are produced or if they will be forced from the cell), which could also be a factor in the overall pH of the cell or its concentration of the electrolyte (which can also affect the resistance of the cell and its current density) or even the electrolyte makeup of the cell...



Cells have a lot going on and there electrochemical reactions can get fairly complicated.
Even the most simple basic cell can get really complicated as to what is going on inside, even if we had two identical cells run on different power supplies we could actually begin to form two different electrochemical reactions in these two similar cells...
 
Hello, maybe it is a this process:

Nickel (II) Carbonate
NiCO3-6H2O
Prepared by electrolysis of CO2-saturated H2O with nickel
electrodes.
An electrolysis cell (20 x 15 x 20 cm.) is covered with a wooden
lid from which three pieces of nickel sheet electrodes (20 x 12.7 x
0.05 cm.) are suspended. Two of the electrodes are placed at the
sides of the vessel and are interconnected; the third is in the center
and serves as the anode. The cell is filled with conductivity water
to 2.5 cm. below the top, pure CO2 is bubbled through, and the current
is turned on and controlled at 2-2.2 amp. The cell is cooled
externally with running water. The NiCO3 • 6H2O drops to the
bottom. It is filtered off and dried at 100°C. The yield is about
30 g./day
 
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