Any substance that moves electrons out of the material is cathode and that moves electron into a material is anode.
Electrochemical reactions is the flow of electric current through electrons between electrodes and electrolyte. The anode is the positive electrode in the reaction and cathode is the negative one.
Conversely, anions and cations are negatively and positively charged ions. Thus, anode contains negative charges which are released into the electrolyte or material. The cathode is positive side which receives those anions from the material. Thus, removing the electron out of material.
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