Electrochemical response to H₂, O₂, CO₂ and NH₃ of a solid-state cell based on a cation- or anion-exchange membrane serving as a solid polymer electrolyte

A new electrochemical cell combining a printed circuit and membrane serving as solid polymer electrolyte is introduced. A perfluorosulfonic acid membrane (Nafion) and Pd and Pt (as working electrodes) were used for the amperometric determination of hydrogen and oxygen at + 0.35 and 0 V, vs. Ag/AgCl, respectively. An anion-exchange membrane and a Cu electrode were used for metering carbon dioxide and ammonia, at - 1 V and +0.1 V, vs. Ag/AgCl, respectively. The response time was in the order of 1 min and linearity of current was observed for concentrations of 0-5 v/o (vol.%) and 5-40 v/o for hydrogen, up to 20 v/o for oxygen and 10 v/o for carbon dioxide and ammonia.