Improvement in the long-term stability of screen-printed planar type solid-state Ag/AgCl reference electrode by introducing poly(dimethylsiloxane) liquid junction

A screen-printed planar type solid-state Ag/AgCl reference electrode in which a poly(dimethylsiloxane) (PDMS) emulsion as the material to form the inner electrolyte layer and the liquid junction, was fabricated for improvement of potential stability. The potential stability of the present reference electrode was for longer than 1680 h (over 2 months). The present reference electrode was insensitive to important ionic species, including Na+, K+, Cl− and PO42−, under continuous measurements. No significant difference of cyclic voltammograms was observed in 10 mM Na2SO4 solution containing 5 mM K3[Fe(CN)6] and K4[Fe(CN)6] with the present or a commercial Ag/AgCl reference electrodes.

► Ag/AgCl reference electrode using poly(dimethylsiloxane) liquid junction. ► The potential stability was for longer than 2 months. ► The present reference electrode was insensitive to important ionic species.