Electrode materials for potentiometric hydrogen sensors |
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| Affiliation: | 1. Faculty of Fisheries and Wildlife, University of Veterinary and Animal Sciences, Lahore, Pakistan;2. Department of Wildlife and Ecology, University of Veterinary and Animal Sciences, Lahore, Pakistan;3. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;4. Department of Material Science and Engineering, Institute of Space Technology, Islamabad 44000, Pakistan;5. Faculty of Materials Science and Chemical Engineering, Ghulam Ishaq Khan Institute of Engineering Science and Technology, Topi, Swabi, KPK 23640, Pakistan;6. Department of Applied Chemistry, Graduate School of Bio-Nano Engineering, Hanyang University, Ansan 426-791, Republic of Korea;1. Laboratory of Alternative Energy Conversion Systems, Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, Volos 38834, Greece;2. Department of Energy Systems, Faculty of Technology, University of Thessaly, Geopolis, Larissa 41500, Greece;3. Institute for Advanced Energy Technologies “Nicola Giordano”, CNR-Consiglio Nazionale delle Ricerche, Via Salita Santa Lucia sopra Contesse, 5, Messina 98126, Italy;4. Laboratory of Materials and Devices for Electrochemical Power Engineering, Institute of Chemical Engineering, Ural Federal University, 620002 Yekaterinburg, Russian Federation;5. Laboratory of Electrochemical Devices based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, Russian Academy of Science, Yekaterinburg 620990, Russian Federation;1. Laboratory of Electrochemical Devices based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, Yekaterinburg 620137, Russia;2. Ural Federal University, Yekaterinburg 620002, Russia;3. Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, Volos 383 34, Greece |
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| Abstract: | Due to their relatively high sensitivity, improved long-term stability, possibilities for miniaturization and low cost products, mixed potential solid electrolyte sensors can be competitive for the in situ measurement of hydrogen trace concentrations in oxygen containing gases. Their response behavior in non-equilibrated oxygen containing gas mixtures is mainly determined by the catalytic activity of the measuring electrode and depends strongly on preparation and measuring conditions. In this work the sensitivity of electrodes made of composites (Au/MeO) has been investigated in hydrogen containing gases in the concentration range φ(H2) = 0…800 vol.-ppm using a two-chamber setup with Pt-air reference. Electrodes made of Au/Nb2O5 composites show the highest sensitivities of up to 20 mV/vol.-ppm at φ(H2) = 10 vol.-ppm and the lowest catalytic activity for hydrogen oxidation. Selected composite materials were tested additionally in self-heated solid electrolyte sensors with both electrodes exposed to the same atmosphere (gas-symmetrical sensor). |
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