The addition of nickel oxide (NiO) to 8 mol% yttria-stabilized zirconia (8YSZ) accelerates the phase transformation from cubic phase to tetragonal phase when exposed to a reducing atmosphere at relatively high temperatures such as 900 ℃, resulting in the degradation of oxide ion conductivity.In this study, NiO-related phase transformation of 8YSZ electrolyte is investigated for anode-supported cells (ASCs). 8YSZ electrolyte co-sintered with NiO-YSZ anode at high temperatures exhibited NiO dissolution into the 8YSZ electrolyte during the sintering process and the amount of dissolved NiO increased with increased sintering temperatures. After reducing the cells at 900 ℃, phase transformation is observed in the 8YSZ electrolyte and resulted in a decrease of the oxide ion diffusion coefficient ( D* ). On the other hand, no phase transformation is observed for the cells reduced at 700 ℃for 5 hours.
{"title":"Phase Transformation of YSZ Electrolyte in Anode-Supported SOFCs","authors":"Qingchuan Bai, Katherine Develos Bagarinao, Tomohiro Ishiyama, Toshiaki Yamaguchi, Haruo Kishimoto","doi":"10.1149/11205.0023ecst","DOIUrl":"https://doi.org/10.1149/11205.0023ecst","url":null,"abstract":"The addition of nickel oxide (NiO) to 8 mol% yttria-stabilized zirconia (8YSZ) accelerates the phase transformation from cubic phase to tetragonal phase when exposed to a reducing atmosphere at relatively high temperatures such as 900 ℃, resulting in the degradation of oxide ion conductivity.In this study, NiO-related phase transformation of 8YSZ electrolyte is investigated for anode-supported cells (ASCs). 8YSZ electrolyte co-sintered with NiO-YSZ anode at high temperatures exhibited NiO dissolution into the 8YSZ electrolyte during the sintering process and the amount of dissolved NiO increased with increased sintering temperatures. After reducing the cells at 900 ℃, phase transformation is observed in the 8YSZ electrolyte and resulted in a decrease of the oxide ion diffusion coefficient ( D* ). On the other hand, no phase transformation is observed for the cells reduced at 700 ℃for 5 hours.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135243704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We fabricate p + -GaAs/n-GaN and n + -GaAs/n-GaN junctions using surface activate bonding and measure their capacitance-voltage and current-voltage characteristics. We find that the characteristics of the two junctions are close to each other, which suggests that the band profiles of GaN layers in the two types of junctions are almost the same, i.e., the Fermi-level pinning occurs at the GaAs/GaN interfaces. Breakdown occurs at a reverse bias voltage ≈ -60 V in both junctions. The observed breakdown voltage corresponds to an electric field of as high as ~ 1.6 MV/cm, which is comparable to a reported breakdown field of GaN. We also excite minority electrons in the p + -GaAs layer using a 488-nm laser and successfully observe the photocurrent due to the transport of minority electrons across the reverse-biased GaAs/GaN interfaces.
{"title":"Fabrication and Electrical Characterization of GaAs/GaN Junctions","authors":"Shota Ishimi, Makoto Hirose, Yasuo Shimizu, Yutaka Ohno, Yasuyoshi Nagai, Jianbo Liang, Naoteru Shigekawa","doi":"10.1149/11203.0111ecst","DOIUrl":"https://doi.org/10.1149/11203.0111ecst","url":null,"abstract":"We fabricate p + -GaAs/n-GaN and n + -GaAs/n-GaN junctions using surface activate bonding and measure their capacitance-voltage and current-voltage characteristics. We find that the characteristics of the two junctions are close to each other, which suggests that the band profiles of GaN layers in the two types of junctions are almost the same, i.e., the Fermi-level pinning occurs at the GaAs/GaN interfaces. Breakdown occurs at a reverse bias voltage ≈ -60 V in both junctions. The observed breakdown voltage corresponds to an electric field of as high as ~ 1.6 MV/cm, which is comparable to a reported breakdown field of GaN. We also excite minority electrons in the p + -GaAs layer using a 488-nm laser and successfully observe the photocurrent due to the transport of minority electrons across the reverse-biased GaAs/GaN interfaces.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135243834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nadine Pilinski, Lisa Maria Uhlig, Henrike Schmies, Ruediger Schweiss, Peter Wagner
Gas diffusion layers (GDLs) are commonly used materials for polymer electrolyte membrane fuel cell (PEMFC) applications. Key role of the GDL is the distribution of reaction gases evenly from the bipolar plate to the catalyst layer and enabling the removal of product water. Especially challenging are elevated temperatures and acidic conditions for materials applied in high temperature (HT) PEMFCs. In this work, ex-situ ageing tests on GDLs were performed. First, the GDLs were aged in an electrochemical set-up in concentrated phosphoric acid (PA) at temperatures up to 160 °C. After ageing, the GDLs were analysed regarding their morphology and changes in elemental composition. The results show lower impact after ageing at constant potentials of 0.1 V, 0.8 V and OCV but a significant effect of increasing temperature and higher potential of 1.2 V as well as potential cycling. This is confirmed by morphological analysis.
{"title":"Investigation of Ageing Methods on Gas Diffusion Layers for HT-PEMFC Application","authors":"Nadine Pilinski, Lisa Maria Uhlig, Henrike Schmies, Ruediger Schweiss, Peter Wagner","doi":"10.1149/11204.0257ecst","DOIUrl":"https://doi.org/10.1149/11204.0257ecst","url":null,"abstract":"Gas diffusion layers (GDLs) are commonly used materials for polymer electrolyte membrane fuel cell (PEMFC) applications. Key role of the GDL is the distribution of reaction gases evenly from the bipolar plate to the catalyst layer and enabling the removal of product water. Especially challenging are elevated temperatures and acidic conditions for materials applied in high temperature (HT) PEMFCs. In this work, ex-situ ageing tests on GDLs were performed. First, the GDLs were aged in an electrochemical set-up in concentrated phosphoric acid (PA) at temperatures up to 160 °C. After ageing, the GDLs were analysed regarding their morphology and changes in elemental composition. The results show lower impact after ageing at constant potentials of 0.1 V, 0.8 V and OCV but a significant effect of increasing temperature and higher potential of 1.2 V as well as potential cycling. This is confirmed by morphological analysis.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135243848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Travis Kent van Leeuwen, Ryan Dowdy, Amberly Guerrero, Paul Gannon
This research aims to improve fundamental understanding of the reactive condensation of Chromium (Cr) vapors, which are generated in many high-temperature (>500℃) process environments and can form potentially problematic condensed hexavalent (Cr(VI)) species downstream. . This study focuses on the effects of alkaline oxide additives in aluminosilicate fibers on Cr condensation and speciation. Cr vapors were generated by flowing humid, high-temperature air over chromia (Cr 2 O 3 ) powder, with aluminosilicate fiber samples positioned downstream. Results indicate presence of hexavalent chromium (Cr(VI)) species condensed on all samples investigated, with significantly more on those containing alkaline oxides (CaO and MgO) additions. Comparative results and analyses are discussed to help inform mechanistic understanding and future related research and engineering efforts.
{"title":"Reactive Condensation of Cr Vapor on Aluminosilicates Containing Alkaline Oxides","authors":"Travis Kent van Leeuwen, Ryan Dowdy, Amberly Guerrero, Paul Gannon","doi":"10.1149/11205.0029ecst","DOIUrl":"https://doi.org/10.1149/11205.0029ecst","url":null,"abstract":"This research aims to improve fundamental understanding of the reactive condensation of Chromium (Cr) vapors, which are generated in many high-temperature (>500℃) process environments and can form potentially problematic condensed hexavalent (Cr(VI)) species downstream. . This study focuses on the effects of alkaline oxide additives in aluminosilicate fibers on Cr condensation and speciation. Cr vapors were generated by flowing humid, high-temperature air over chromia (Cr 2 O 3 ) powder, with aluminosilicate fiber samples positioned downstream. Results indicate presence of hexavalent chromium (Cr(VI)) species condensed on all samples investigated, with significantly more on those containing alkaline oxides (CaO and MgO) additions. Comparative results and analyses are discussed to help inform mechanistic understanding and future related research and engineering efforts.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135243865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Steffen Hess, Shidong Zhang, Thomas Kadyk, Werner Lehnert, Michael Eikerling, Steven B. Beale
This study presents a computational simulation of a zero-gap alkaline water electrolysis cell. The model employed is a three-dimensional, steady-state, non-isothermal, two-phase-flow computational fluid dynamics approach, which has been implemented by means of the OpenFOAM software library. This integration expands the capabilities of the existing libraries within the open-source framework, openFuelCell2, by introducing novel surface and volumetric coupling strategies to connect the dependent quantities over the existing interfaces and different regions. Additionally, the Nernst–Planck equation is incorporated into the two-phase Eulerian–Eulerian framework to describe the behavior of the liquid electrolyte within the cell.The model’s validation in this study is based on experimentally-determined polarization curves for various temperatures and volumetric flow rates. The results obtained show good agreement with the experimentally-acquired data. The implemented model has demonstrated its ability to accurately predict the transport of ions within the electrolyte and assess the influence of the generated gas phase on the local distribution of current density.
{"title":"Numerical Two-Phase Simulations of Alkaline Water Electrolyzers","authors":"Steffen Hess, Shidong Zhang, Thomas Kadyk, Werner Lehnert, Michael Eikerling, Steven B. Beale","doi":"10.1149/11204.0419ecst","DOIUrl":"https://doi.org/10.1149/11204.0419ecst","url":null,"abstract":"This study presents a computational simulation of a zero-gap alkaline water electrolysis cell. The model employed is a three-dimensional, steady-state, non-isothermal, two-phase-flow computational fluid dynamics approach, which has been implemented by means of the OpenFOAM software library. This integration expands the capabilities of the existing libraries within the open-source framework, openFuelCell2, by introducing novel surface and volumetric coupling strategies to connect the dependent quantities over the existing interfaces and different regions. Additionally, the Nernst–Planck equation is incorporated into the two-phase Eulerian–Eulerian framework to describe the behavior of the liquid electrolyte within the cell.The model’s validation in this study is based on experimentally-determined polarization curves for various temperatures and volumetric flow rates. The results obtained show good agreement with the experimentally-acquired data. The implemented model has demonstrated its ability to accurately predict the transport of ions within the electrolyte and assess the influence of the generated gas phase on the local distribution of current density.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135244451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ruediger Schweiss, Magnus Herb, Raj Earla, Christian Meiser
A systematic study was performed with GDLs based on a singular backing using different MPL types and penetration levels. A simple method to estimate the micro-porous layer penetration in gas diffusion layers based on data obtained from force-deflection behavior of backings and MPL-coated GDLs is proposed. Comparison with SEM and previously published tomographic studies shows that a good estimate for the extent of MPL intrusion into the backing is obtained. MPL loading and penetration is shown to affect different ex-situ GDL properties (in-plane gas permeability, electrical and thermal conductivity) as well as the GDL single cell performance characteristics with respect to humification and high current density operation. Similar effects are reported for MPLs differing with respect to the presence of mud-cracks.
{"title":"On the Importance of MPL Structural Characteristics for PEM Fuel Cell Performance","authors":"Ruediger Schweiss, Magnus Herb, Raj Earla, Christian Meiser","doi":"10.1149/11204.0135ecst","DOIUrl":"https://doi.org/10.1149/11204.0135ecst","url":null,"abstract":"A systematic study was performed with GDLs based on a singular backing using different MPL types and penetration levels. A simple method to estimate the micro-porous layer penetration in gas diffusion layers based on data obtained from force-deflection behavior of backings and MPL-coated GDLs is proposed. Comparison with SEM and previously published tomographic studies shows that a good estimate for the extent of MPL intrusion into the backing is obtained. MPL loading and penetration is shown to affect different ex-situ GDL properties (in-plane gas permeability, electrical and thermal conductivity) as well as the GDL single cell performance characteristics with respect to humification and high current density operation. Similar effects are reported for MPLs differing with respect to the presence of mud-cracks.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135245729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cu-Cu hybrid bonding is a significant technology for fabricating 3D stacked semiconductor devices. In hybrid bonding, the calculation of bonding strength is complex due to the various materials present in the bonding interface. This interface not only includes Cu/Cu and dielectric/dielectric interfaces, but also the Cu/dielectric interface because of the misalignment of Cu pads. In this study, we developed an integrated model regarding total bonding strength, considering the different interfaces. Additionally, considering the thermal expansion of Cu pads, we demonstrated the dependence of bonding strength on misalignment using simulations. At the dielectric/dielectric bonding interface, a phenomenon was observed, in which the H 2 O contained in the dielectric enhanced the bonding strength. We proposed a model for the increase of the bonding strength by filling the bonding interface gap with thermally expanded dielectrics. These results provide understanding regarding a part of the mechanism involved in bonding strength in Cu-Cu hybrid bonding.
{"title":"(Invited) Bonding Strength of Cu-Cu Hybrid Bonding for 3D Integration Process","authors":"Nobutoshi Fujii, Shunsuke Furuse, Hirotaka Yoshioka, Naoki Ogawa, Taichi Yamada, Takaaki Hirano, Suguru Saito, Yoshiya Hagimoto, Hayato Iwamoto","doi":"10.1149/11203.0003ecst","DOIUrl":"https://doi.org/10.1149/11203.0003ecst","url":null,"abstract":"Cu-Cu hybrid bonding is a significant technology for fabricating 3D stacked semiconductor devices. In hybrid bonding, the calculation of bonding strength is complex due to the various materials present in the bonding interface. This interface not only includes Cu/Cu and dielectric/dielectric interfaces, but also the Cu/dielectric interface because of the misalignment of Cu pads. In this study, we developed an integrated model regarding total bonding strength, considering the different interfaces. Additionally, considering the thermal expansion of Cu pads, we demonstrated the dependence of bonding strength on misalignment using simulations. At the dielectric/dielectric bonding interface, a phenomenon was observed, in which the H 2 O contained in the dielectric enhanced the bonding strength. We proposed a model for the increase of the bonding strength by filling the bonding interface gap with thermally expanded dielectrics. These results provide understanding regarding a part of the mechanism involved in bonding strength in Cu-Cu hybrid bonding.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135246021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bilal Amoury, Tien Dung Le, Jérôme Dillet, Sébastien Leclerc, Gael Maranzana, Sophie Didierjean
Proton Exchange Membrane (PEM) electrolysis is a promising technology for large industrial-scale hydrogen production, but it faces limitations due to mass transport and electrical transfer issues in the anode Porous Transport Layer (PTL). The optimal porosity and pore size of the PTL contributes to efficient water, gas, and electron transport. In this work, the water/gas counter-current flow through the PTL was studied by both experiment and modeling. Magnetic Resonance Imaging (MRI) is utilized to quantify water content within the porous layer during the two-phase flow for different gas and water inlet flow rates. The dependence of the saturation profile and bubble formation on the gas/water flow rates, water channel's orientation, flow direction is studied. To better understand the two-phase flow characteristics in the PTL, the phase-field model based on the Cahn-Hilliard theory for describing a diffuse interface is used to model the water and gas transport over 2D porous layer.
{"title":"Two-Phase Flow Through the PTL of PEM Water Electrolyzer: MRI Experiments and Numerical Modeling Using Phase-Field Theory","authors":"Bilal Amoury, Tien Dung Le, Jérôme Dillet, Sébastien Leclerc, Gael Maranzana, Sophie Didierjean","doi":"10.1149/11204.0167ecst","DOIUrl":"https://doi.org/10.1149/11204.0167ecst","url":null,"abstract":"Proton Exchange Membrane (PEM) electrolysis is a promising technology for large industrial-scale hydrogen production, but it faces limitations due to mass transport and electrical transfer issues in the anode Porous Transport Layer (PTL). The optimal porosity and pore size of the PTL contributes to efficient water, gas, and electron transport. In this work, the water/gas counter-current flow through the PTL was studied by both experiment and modeling. Magnetic Resonance Imaging (MRI) is utilized to quantify water content within the porous layer during the two-phase flow for different gas and water inlet flow rates. The dependence of the saturation profile and bubble formation on the gas/water flow rates, water channel's orientation, flow direction is studied. To better understand the two-phase flow characteristics in the PTL, the phase-field model based on the Cahn-Hilliard theory for describing a diffuse interface is used to model the water and gas transport over 2D porous layer.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135198910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ko Yoshiga, Takeaki Okamoto, Yuya Tachikawa, Kazunari Sasaki
Visualization of reactions occurring inside a solid oxide cell (SOC) during operation is difficult due to the limitation of the operatable temperature to use various sensors and measurement equipment. Therefore, we are investigating a visualization method to combine three-dimensional simulation with in-operando temperature observation inside SOCs. In this study, we focused on evaluating the effect of a current collector shape on the cell performance and temperature distribution. As a result, we confirmed that the effects of several current collector shape modifications appeared in the temperature distribution. Based on the calculated temperature and current density distributions, we proposed an appropriate current collector shape for observing the temperature distribution inside the cell by experiment. Using the practical observation setup model considered in this study, the influence of sulfur poisoning on the temperature distribution was also calculated and evaluated.
{"title":"Effects of Current Collector on Internal Visualization of Solid Oxide Cells","authors":"Ko Yoshiga, Takeaki Okamoto, Yuya Tachikawa, Kazunari Sasaki","doi":"10.1149/11205.0129ecst","DOIUrl":"https://doi.org/10.1149/11205.0129ecst","url":null,"abstract":"Visualization of reactions occurring inside a solid oxide cell (SOC) during operation is difficult due to the limitation of the operatable temperature to use various sensors and measurement equipment. Therefore, we are investigating a visualization method to combine three-dimensional simulation with in-operando temperature observation inside SOCs. In this study, we focused on evaluating the effect of a current collector shape on the cell performance and temperature distribution. As a result, we confirmed that the effects of several current collector shape modifications appeared in the temperature distribution. Based on the calculated temperature and current density distributions, we proposed an appropriate current collector shape for observing the temperature distribution inside the cell by experiment. Using the practical observation setup model considered in this study, the influence of sulfur poisoning on the temperature distribution was also calculated and evaluated.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135198911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The quantification method of mass transfer resistance in the cathode catalyst layer (CCL) should be established in order to appropriately evaluate the cell performance. Lots of PEFC research assumes that any resistances in PEFC are in series to reaction resistance. In this study, oxygen and proton transfer resistances in CCL were quantitatively separated from reaction resistance by applying the model where the through-plane mass- transport resistances were parallel to the reaction resistance. In order to evaluate oxygen and proton transfer resistance, a dimensionless cathode isothermal one-dimensional model was applied. The mass transfer resistance in CCL can be quantitatively evaluated by obtaining the value of five dimensionless moduli derived from mass balance. Polarization curves dependency on the oxygen partial pressure and relative humidity (RH) were measured at the temperature of 80 °C. Reaction rate parameters, effective oxygen diffusion coefficient, effective proton conductivity, and oxygen permeance through the ionomer layer were determined.
{"title":"Quantification Method of Mass Transfer Resistance in Cathode Catalyst Layer in PEFC","authors":"Hikaru Ogawa, Yuji Okada, Miho Kageyama, Hisaaki Gyoten, Shuka Murakami, Motoaki Kawase","doi":"10.1149/11204.0121ecst","DOIUrl":"https://doi.org/10.1149/11204.0121ecst","url":null,"abstract":"The quantification method of mass transfer resistance in the cathode catalyst layer (CCL) should be established in order to appropriately evaluate the cell performance. Lots of PEFC research assumes that any resistances in PEFC are in series to reaction resistance. In this study, oxygen and proton transfer resistances in CCL were quantitatively separated from reaction resistance by applying the model where the through-plane mass- transport resistances were parallel to the reaction resistance. In order to evaluate oxygen and proton transfer resistance, a dimensionless cathode isothermal one-dimensional model was applied. The mass transfer resistance in CCL can be quantitatively evaluated by obtaining the value of five dimensionless moduli derived from mass balance. Polarization curves dependency on the oxygen partial pressure and relative humidity (RH) were measured at the temperature of 80 °C. Reaction rate parameters, effective oxygen diffusion coefficient, effective proton conductivity, and oxygen permeance through the ionomer layer were determined.","PeriodicalId":11473,"journal":{"name":"ECS Transactions","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135198919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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