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(a) Temperature dependence of the response voltage ΔV to 1000 ppm mixed gases (500 ppm CH4 + 500 ppm H2) in air over the temperature range 100–400 °C. (b) ΔV as a function of the mixed gas concentration at 400, 391 and 400 °C for devices #1, #2 and #3. (c) The estimated ΔV to the mixed gases, calculated from the experimental data for the response voltages to H2 and CH4 from Figure 4, using the formula: [(ΔV to H2) + (ΔV to CH4)]/2.
