H/D isotopic exchange and electrochemical kinetics of hydrogen oxidation on Ni-cermets with oxygen-ionic and protonic electrolytes
| Autor: | D.A. Osinkin, E.S. Tropin, Maxim V. Ananyev, Andrey S. Farlenkov, N. M. Porotnikova, D.M. Zakharov |
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| Rok vydání: | 2022 |
| Předmět: |
ELECTROCHEMICAL ELECTRODES
SOLID OXIDE FUEL CELLS (SOFC) Materials science Hydrogen NICKEL Inorganic chemistry SOLID ELECTROLYTES Electrochemical kinetics Oxide Energy Engineering and Power Technology chemistry.chemical_element LANTHANUM Electrolyte OXIDATION Oxygen OXYGEN Electrochemical cell chemistry.chemical_compound HYDROGEN OXIDATION YTTRIA-STABILIZED ZIRCONIA SPILLOVER Electrical and Electronic Engineering Physical and Theoretical Chemistry ELECTROCHEMICAL KINETICS LANTHANUM COMPOUNDS SCANDATES YTTRIA STABILIZED ZIRCONIA Renewable Energy Sustainability and the Environment CERMETS H/D ISOTOPE EXCHANGE HYDROGEN YTTRIUM OXIDE Atmospheric temperature range LANTHANUM SCANDATE chemistry ISOTOPE EXCHANGE ISOTOPES STRONTIUM COMPOUNDS NI CERMET TEMPERATURE RANGE Hydrogen spillover |
| Zdroj: | J Power Sources Journal of Power Sources |
| ISSN: | 0378-7753 1190-2019 |
| Popis: | Ni–Zr0.82Y0.18O1.91 (YSZ) and Ni–La0.90Sr0.10ScO2.95 (LSS) cermets for solid oxide and protonic ceramic electrochemical cells were studied by means of H/D isotope exchange with the gas phase equilibration method for the first time. The experiments were carried out at 2 mbar of dry hydrogen in the temperature range of 400–800 ᵒC. The three parallel channels of hydrogen surface exchange were found to exist in both Ni-YSZ and Ni-LSS cermets. The mechanism of hydrogen isotope exchange for Ni-YSZ was found to be temperature independent, while, in the case of Ni-LSS, the mechanism changed with temperature and was more complicated at lower temperatures (400–600 °C). It was revealed that hydrogen spillover was the rate-determining step for both cermets. The electrochemical kinetics of hydrogen oxidation were studied on symmetric cells with a YSZ supported electrolyte and Ni-YSZ electrodes and with an LSS supported electrolyte and Ni-LSS electrodes in a wet (3 vol % H 2O) hydrogen atmosphere at 1 atm. The mechanism of hydrogen oxidation on the Ni-LSS electrode differs from that of the Ni-YSZ electrode. It changes with temperature and is also more complicated at a lower temperature range. © 2021 Elsevier B.V. This work is supported by the State Assignment of Ministry of Science and Higher Education of the Russian Federation [No. AAAA-A19-119020190078-6 ], and the Act 211 of the Government of the Russian Federation, agreement [No. 02. A03.21.0006 ]. The facilities of the Shared Access Centre “Composition of Compounds” and Unique Scientific Setup “Isotopic Exchange” of IHTE UB RAS were used. The authors are grateful D.M. Solodyankina and A.Yu. Stroeva for support in the preparation of samples. |
| Databáze: | OpenAIRE |
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