Kinetic and thermodynamic information derived from electrochemical measurements on stationary states

Experiments are reported on the electrochemical displacement of the nonlinear minimum bromate reaction from stationary states far from equilibrium and from equilibrium. We measure the Ce-IV/Ce-III electrode potential V at a given displacement effected by an imposed current clamp, I. The variation of the excess power (V-V-s)I, where V-s is the electrode potential at a stationary state, versus the imposed current is of the same form as the time derivative of an excess work, related in prior theoretical analyses to the thermodynamics of systems far from equilibrium.