Nafion-based solid-state gas sensors: Pt/Nation electrodes prepared by an impregnation-reduction method in sensing oxygen

The influences of the reductant concentration of NaBH₄ and the quantity of Pt loading on the active surface area and the sensitivity of the Pt/Nafion electrodes prepared by an impregnation-reduction method in detecting oxygen were investigated in this study. The Pt/Nafion electrodes with a Pt loading of 4.99 mg/cm², obtained at 0.0107 M Pt(NH₃)₄Cl₂ and 0.06 M NaBH₄, show maximum sensitivities of 0.0528 μA/ppm and 0.0538 μA/ppm obtained in O₂ concentration regions of 0-5000 and 5000-50 000 ppm, respectively. A sensing model was also proposed to illustrate the sensing phenomenon.