That would be difficult as chlorine exists as a gas at room temperature, but it could be part of a galvanic cell. Chlorine is a strong oxidizing agent, and has a standard electrode potential of like +2.05V or something along those lines. Anything with a potential lower than that could make a galvanic cell with chlorine, albeit a probably short lived one. Would you want to use chlorine? Definitely not, but you could. Galvanic cells are all about redox reactions and movement of electrons, it doesn't have to be just metals, but it is far more practical that way.