Sensoring hydrogen gas concentration using electrolyte made of proton conductive manganese dioxide

Hydrogen gas promises to be a major clean fuel in the near future. Thus, sensors that can measure the concentrations of hydrogen gas over a wide dynamic range (e.g., 1–99.9%) are in demand for the production, storage, and utilization of hydrogen gas. However, it is difficult to directly measure hydrogen gas concentrations greater than 10% using conventional sensor [1–11]. We report a simple sensor using an electrolyte made of proton conductive manganese dioxide that enables in situ measurements of hydrogen gas concentration over a wide range of 0.1–99.9% at room temperature.