There is disclosed a process for performing an isolated Pd(0) catalyzed reaction electrochemically on an electrode array device. Specifically, there is disclosed a process for conducting an isolated Pd(0) catalyzed reaction on a plurality of electrodes, comprising providing an electrode array device having a matrix or coating material over metallic or conductive electrodes surfaces and a plurality of electrodes; providing a solution bathing the electrode array device, wherein the solution comprises a transition metal catalyst and a confining agent; and biasing one or a plurality of electrodes on the electrode array device with a voltage or current to regenerate the transition metal catalyst required for the isolated Pd(0) catalyzed reaction, whereby the confining agent limits diffusion of the transition metal catalyst to a volume surrounding each selected electrode surface.