Current can only flow from the anode to the cathode, but not the other direction.
The fuel cell also needs moisture in the electrolyte as well as water at the anode to control the supply of methanol.
As soon as the circuit of the lead storage battery cell is closed and the cathode and anode are connected, the reaction begins and electrons flow from the anode to the cathode.
Oxygen enters at the cathode, where it combines with electrons and is split into ions that travel through the electrolyte to react with fuel at the anode .
One is a photosensitive cathode which emits electrons when exposed to light and the other is an anode which is maintained at a positive voltage with respect to the cathode.
Meanwhile, copper atoms in the positive anode give up electrons and dissolve into the electrolyte solution as copper ions.
At one electrode, the anode , molecules of hydrogen gas break down into electrons and positively charged hydrogen ions.
Because electrons originate at the anode in a voltaic cell, the anode has a (-) charge; electrons enter the cathode, which has a (+) charge.
Such corrosion occurs when the heavy metal, the heavy metal basic salts or both plate out to form active cathodes on the anodic magnesium surface.
Surface properties of titanium and its alloys can be modified by anodic oxidation treatment, which covers the entire surface with a thin but compact oxide film.