When using a methane sensor a voltage is applied and much like electrolysis if the voltage is above the decomposition potential a reaction happens. Flammable gasses like methane are easily oxidized and thus produce an anodic current. But what is the cathodic current reaction in a methane sensor in air? what is being reduced?

  • $\begingroup$ Is the CO2 reduced to CO carbon monoxide? Can the methane be oxidised to Methanol in the presence of water? $\endgroup$ – ChemEng Sep 16 '20 at 22:59
  • $\begingroup$ CH4 + 2O2 --> CO2 + 2 H2O is this the full redox eqn? $\endgroup$ – ChemEng Sep 16 '20 at 23:09
  • $\begingroup$ I’ve heard aqueous based (typically acidic) electrolytes produce hazardous substances. But what are they? This was what they used in the 60s iirc $\endgroup$ – ChemEng Sep 17 '20 at 2:28

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