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Abstract
The influence of Pd and Ni coatings on the oxidisation of hydrogen that permeated through a thin iron membrane was studied for the development of a hydrogen sensor. The minimum electroplating period and current density to produce compact Ni and Pd coatings were investigated. The ideal potential ranges for complete oxidation of the hydrogen that permeated through an iron membrane were found to be +0·20 to +0·50 V(Ni) (voltage versus the voltage on nickel wire) and +0·30 to +0·40 V(Ni) for the Pd and Ni coatings respectively; the Pd coating provides a wider window for oxidation. The optimum potential for the oxidation of hydrogen on Ni coating was found to be 0·35 V(Ni). Ni coating could achieve the same detection efficiency as a Pd coating with the appropriate applied potential.
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This work was supported by the Technical 863 Foundation of China (grant no. 2006AA05Z140) and the Open Foundation of Key Laboratory of Environmental Fracture of the Education Ministry of China, University of Science and Technology Beijing.