Do I Need a Battery for a Positive Redox Reaction?

[RougeSun]

For a reaction where the electric potential is positive, does there need to be something to provide voltage for the reaction to occur? Let's say E= 1.34V for the reaction. Do I need to connect the electrode terminals to a battery to provide 1.34V?

 

[Topher925]

Nope. As long as the reaction can occur spontaneously, the electrode terminals will have a potential.