Electrochemical Detection of H2, CO, and Hydrocarbons in Inert or Oxygen Atmospheres

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Abstract
A unique electrochemical sensor is described for quantitatively detecting hydrogen in gas mixtures containing electrochemically inert species. Limiting diffusion current measurements in the range of +0.25 to 0.65V vs. a platinum electrode in the same acid solution are proportional to the hydrogen content in the bulk phase. When active species, such as oxygen, are present in binary or ternary gas mixtures, the hydrogen content of the gas phase is determined by maintaining a working electrode potential of +1.06V (oxygen or air rest potential on Pt black in acid) at which hydrogen is immediately ionized even in the presence of oxygen on the electrode surface. The feasibility of detecting carbon monoxide and hydrocarbons in oxygen‐containing atmospheres using the electrical biasing technique is demonstrated. The limitations and practical applications of the sensing devices are discussed.

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