The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform
Glenn C Mather - One of the best experts on this subject based on the ideXlab platform.
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transport number determination of a protonic ceramic electrolyte membrane via electrode polarisation correction with the gorelov method
Journal of Power Sources, 2014Co-Authors: Domingo Perezcoll, Gemma Herasjuaristi, Duncan P Fagg, Glenn C MatherAbstract:Abstract Analysis of transport numbers is critical for assessing the suitability of an ion-conducting Material for a given electrochemical application and the conditions for its employment. In this work, the proton, oxide-ion and electron transport numbers of the candidate protonic ceramic electrolyser and Fuel Cell Material SrZr0.9Y0.1O3−δ (with the addition of 4 mol% ZnO as sintering aid) are measured in wet and dry oxidising atmospheres in the temperature range 700–850 °C. The determination of proton transport numbers is analysed in detail, encompassing the suitability of equivalent circuits in different conditions and the inclusion of an external parallel resistance for the correction of electrode-polarisation effects (Gorelov method). It is confirmed that transport numbers are highly inaccurate if no polarisation correction is applied. In dry oxidising conditions oxide-ion transport numbers, to, lie in the range 0.63–0.78. The conductivity in wet oxidising conditions is dominated by protons and an electronic component, with the proton transport number increasing from 0.79 to 0.88 with increasing pH2O in the range 1.1 × 10−3 ≤ pH2O ≤ 1.27 × 10−2 atm at 700 °C.
Domingo Perezcoll - One of the best experts on this subject based on the ideXlab platform.
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transport number determination of a protonic ceramic electrolyte membrane via electrode polarisation correction with the gorelov method
Journal of Power Sources, 2014Co-Authors: Domingo Perezcoll, Gemma Herasjuaristi, Duncan P Fagg, Glenn C MatherAbstract:Abstract Analysis of transport numbers is critical for assessing the suitability of an ion-conducting Material for a given electrochemical application and the conditions for its employment. In this work, the proton, oxide-ion and electron transport numbers of the candidate protonic ceramic electrolyser and Fuel Cell Material SrZr0.9Y0.1O3−δ (with the addition of 4 mol% ZnO as sintering aid) are measured in wet and dry oxidising atmospheres in the temperature range 700–850 °C. The determination of proton transport numbers is analysed in detail, encompassing the suitability of equivalent circuits in different conditions and the inclusion of an external parallel resistance for the correction of electrode-polarisation effects (Gorelov method). It is confirmed that transport numbers are highly inaccurate if no polarisation correction is applied. In dry oxidising conditions oxide-ion transport numbers, to, lie in the range 0.63–0.78. The conductivity in wet oxidising conditions is dominated by protons and an electronic component, with the proton transport number increasing from 0.79 to 0.88 with increasing pH2O in the range 1.1 × 10−3 ≤ pH2O ≤ 1.27 × 10−2 atm at 700 °C.
Yi Yu - One of the best experts on this subject based on the ideXlab platform.
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a review on performance degradation of proton exchange membrane Fuel Cells during startup and shutdown processes causes consequences and mitigation strategies
Journal of Power Sources, 2012Co-Authors: Yi Yu, Hui Li, Haijiang Wang, Xiaozi Yuan, Guangjin Wang, Mu PanAbstract:Abstract Performance degradation during startup and shutdown is considered an important issue affecting the durability and lifetime of proton exchange membrane Fuel Cells (PEMFCs). Due to the high potentials experienced by the cathode during startup and shutdown, the conventional carbon support for the cathode catalyst is prone to oxidation by reacting with oxygen or water. This paper presents an overview of the causes and consequences of performance degradation after frequent startup–shutdown cycles. Mitigation strategies are also summarized, including the use of novel catalyst supports and the application of system strategies to prevent performance degradation in PEMFCs. It is found from the literature review that improvements in catalyst supports to prevent oxidation come at the expense of high cost, and the novel supports developed to date are not sufficient to completely prevent carbon oxidation in Fuel Cell engines. System strategies, including potential control and reaction gas control, have been developed and applied in Fuel Cell engines to alleviate or even avoid performance decay. This review aims to provide a clear understanding of the mechanisms related to degradation behaviors during the startup and shutdown processes, thereby helping Fuel Cell Material or system developers in their efforts to prevent performance degradation and prolong the lifetime of PEMFCs.
Mu Pan - One of the best experts on this subject based on the ideXlab platform.
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a review on performance degradation of proton exchange membrane Fuel Cells during startup and shutdown processes causes consequences and mitigation strategies
Journal of Power Sources, 2012Co-Authors: Yi Yu, Hui Li, Haijiang Wang, Xiaozi Yuan, Guangjin Wang, Mu PanAbstract:Abstract Performance degradation during startup and shutdown is considered an important issue affecting the durability and lifetime of proton exchange membrane Fuel Cells (PEMFCs). Due to the high potentials experienced by the cathode during startup and shutdown, the conventional carbon support for the cathode catalyst is prone to oxidation by reacting with oxygen or water. This paper presents an overview of the causes and consequences of performance degradation after frequent startup–shutdown cycles. Mitigation strategies are also summarized, including the use of novel catalyst supports and the application of system strategies to prevent performance degradation in PEMFCs. It is found from the literature review that improvements in catalyst supports to prevent oxidation come at the expense of high cost, and the novel supports developed to date are not sufficient to completely prevent carbon oxidation in Fuel Cell engines. System strategies, including potential control and reaction gas control, have been developed and applied in Fuel Cell engines to alleviate or even avoid performance decay. This review aims to provide a clear understanding of the mechanisms related to degradation behaviors during the startup and shutdown processes, thereby helping Fuel Cell Material or system developers in their efforts to prevent performance degradation and prolong the lifetime of PEMFCs.
Gemma Herasjuaristi - One of the best experts on this subject based on the ideXlab platform.
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transport number determination of a protonic ceramic electrolyte membrane via electrode polarisation correction with the gorelov method
Journal of Power Sources, 2014Co-Authors: Domingo Perezcoll, Gemma Herasjuaristi, Duncan P Fagg, Glenn C MatherAbstract:Abstract Analysis of transport numbers is critical for assessing the suitability of an ion-conducting Material for a given electrochemical application and the conditions for its employment. In this work, the proton, oxide-ion and electron transport numbers of the candidate protonic ceramic electrolyser and Fuel Cell Material SrZr0.9Y0.1O3−δ (with the addition of 4 mol% ZnO as sintering aid) are measured in wet and dry oxidising atmospheres in the temperature range 700–850 °C. The determination of proton transport numbers is analysed in detail, encompassing the suitability of equivalent circuits in different conditions and the inclusion of an external parallel resistance for the correction of electrode-polarisation effects (Gorelov method). It is confirmed that transport numbers are highly inaccurate if no polarisation correction is applied. In dry oxidising conditions oxide-ion transport numbers, to, lie in the range 0.63–0.78. The conductivity in wet oxidising conditions is dominated by protons and an electronic component, with the proton transport number increasing from 0.79 to 0.88 with increasing pH2O in the range 1.1 × 10−3 ≤ pH2O ≤ 1.27 × 10−2 atm at 700 °C.
