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I'm pretty sure voltaic and galvanic cell are the same (convert chemical energy to electrical energy, standard cell potential is always positive). Electrolytic cells convert electrical energy to chemical energy, and use spontaneous reactions to drive nonspontaneous reactions, the standard cell potential will be negative, since it is nonspontaneous. Concentration cells have a standard cell potential of O, and are driven by differing concentrations of the same compound on each side (cathode and anode) of the cell. Concentration cells also convert chemical energy in electrical energy, and once they reach equilibrium, the reaction stops (because there is no longer a concentration difference).
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