A New Potential‐Type Humidity Sensor Using EMD‐Based Manganese Oxides as a Solid Electrolyte

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Abstract
A new approach for a potential‐type humidity sensor is to use the battery systems as the sensing elements, where are two electrodes of different metals, and samples act as the solid electrolyte. Systems consisting of electrolytes with Pt/Cu electrodes are most favorable for obtaining high electrical potentials in a high ambient humidity. However, the humidity response characteristics of these systems can be greatly improved by mixing a certain amount of into the electrolyte materials. For all systems, the potential value produced between the Pt/Cu couple tends to equal the sum of those produced between the Pt/Ni and the Cu/Ni couples. A simple model is proposed to interpret the phenomena.

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