The printed G-CAPodes were electrochemically analyzed with a computer-controlled multichannel potentiostat/galvanostat (VMP300; Biologic ® ; France) using a CE-to-ground setup synchronizing two channels with one CE. In this setup, the ground as well as the REF2 cables from channel 1 and 2 are connected to the CE, while the blue cables (CE; REF3) of channel 1 are connected to the WE of the device (Figure ). The blue cables from channel 2 represent the second WE of the setup and are connected to the GE. This connection enables to measurement of two working electrodes separately (both connected to one counter electrode)