Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law

It is important for the improvement of the performance and durability of solid oxide fuel cells (SOFCs) to clarify gas transfer phenomena in their porous electrodes. This study proposes two methods, an oxygen sensor method and an electrochemical impedance method, for the in-situ measurement of the e...

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Autores principales:	Masaaki IZUMI, Takuya NISHITERA, Hisashi SAKAMOTO, Miki MATSUI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	solid oxide fuel cell anode effective binary diffusivity fick’s law hydrogen gas concentration oxygen sensor electrochemical impedance concentration overvoltage Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/3f6128e34b59425090436ccbc8c8b0ae
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spelling	oai:doaj.org-article:3f6128e34b59425090436ccbc8c8b0ae2021-11-29T06:01:26ZDetermination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law2187-974510.1299/mej.20-00239https://doaj.org/article/3f6128e34b59425090436ccbc8c8b0ae2020-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/5/7_20-00239/_pdf/-char/enhttps://doaj.org/toc/2187-9745It is important for the improvement of the performance and durability of solid oxide fuel cells (SOFCs) to clarify gas transfer phenomena in their porous electrodes. This study proposes two methods, an oxygen sensor method and an electrochemical impedance method, for the in-situ measurement of the effective binary diffusivity of an H2 – H2O system in the anode of an anode-supported SOFC, which is composed of a YSZ (Y2O3 stabilized ZrO2) electrolyte and an Ni-YSZ anode. By these methods, the effective binary diffusivity is determined based on Fick’s law by using hydrogen gas concentrations at two positions, the inside and surface of the anode. When the oxygen sensor method is used, a local hydrogen gas concentration in the anode is determined with a sensor made of a platinum wire coated with YSZ. On the other hand, when the electrochemical impedance method is used, a mean hydrogen gas concentration in the anode adjoining the electrolyte is determined by analyzing the measured electrochemical impedance spectra. The effective binary diffusivities determined by these methods are almost the same under the same conditions. And also they are in agreement with effective binary diffusivities calculated using the porosity and volume-averaged pore diameter obtained by analyzing the anode cross-section in an SEM image. Therefore, it is judged that both of these proposed methods enable the in-situ measurement of the hydrogen gas diffusivities in the anode when the SOFC is in operation. Furthermore, it is shown that nitrogen gas, including fuel gas, may work to inhibit the transfer of hydrogen gas.Masaaki IZUMITakuya NISHITERAHisashi SAKAMOTOMiki MATSUIThe Japan Society of Mechanical Engineersarticlesolid oxide fuel cellanodeeffective binary diffusivityfick’s lawhydrogen gas concentrationoxygen sensorelectrochemical impedanceconcentration overvoltageMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 5, Pp 20-00239-20-00239 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	solid oxide fuel cell anode effective binary diffusivity fick’s law hydrogen gas concentration oxygen sensor electrochemical impedance concentration overvoltage Mechanical engineering and machinery TJ1-1570
spellingShingle	solid oxide fuel cell anode effective binary diffusivity fick’s law hydrogen gas concentration oxygen sensor electrochemical impedance concentration overvoltage Mechanical engineering and machinery TJ1-1570 Masaaki IZUMI Takuya NISHITERA Hisashi SAKAMOTO Miki MATSUI Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law
description	It is important for the improvement of the performance and durability of solid oxide fuel cells (SOFCs) to clarify gas transfer phenomena in their porous electrodes. This study proposes two methods, an oxygen sensor method and an electrochemical impedance method, for the in-situ measurement of the effective binary diffusivity of an H2 – H2O system in the anode of an anode-supported SOFC, which is composed of a YSZ (Y2O3 stabilized ZrO2) electrolyte and an Ni-YSZ anode. By these methods, the effective binary diffusivity is determined based on Fick’s law by using hydrogen gas concentrations at two positions, the inside and surface of the anode. When the oxygen sensor method is used, a local hydrogen gas concentration in the anode is determined with a sensor made of a platinum wire coated with YSZ. On the other hand, when the electrochemical impedance method is used, a mean hydrogen gas concentration in the anode adjoining the electrolyte is determined by analyzing the measured electrochemical impedance spectra. The effective binary diffusivities determined by these methods are almost the same under the same conditions. And also they are in agreement with effective binary diffusivities calculated using the porosity and volume-averaged pore diameter obtained by analyzing the anode cross-section in an SEM image. Therefore, it is judged that both of these proposed methods enable the in-situ measurement of the hydrogen gas diffusivities in the anode when the SOFC is in operation. Furthermore, it is shown that nitrogen gas, including fuel gas, may work to inhibit the transfer of hydrogen gas.
format	article
author	Masaaki IZUMI Takuya NISHITERA Hisashi SAKAMOTO Miki MATSUI
author_facet	Masaaki IZUMI Takuya NISHITERA Hisashi SAKAMOTO Miki MATSUI
author_sort	Masaaki IZUMI
title	Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law
title_short	Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law
title_full	Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law
title_fullStr	Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law
title_full_unstemmed	Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law
title_sort	determination of effective binary diffusivity in anode of solid oxide fuel cell based on fick’s law
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/3f6128e34b59425090436ccbc8c8b0ae
work_keys_str_mv	AT masaakiizumi determinationofeffectivebinarydiffusivityinanodeofsolidoxidefuelcellbasedonfickslaw AT takuyanishitera determinationofeffectivebinarydiffusivityinanodeofsolidoxidefuelcellbasedonfickslaw AT hisashisakamoto determinationofeffectivebinarydiffusivityinanodeofsolidoxidefuelcellbasedonfickslaw AT mikimatsui determinationofeffectivebinarydiffusivityinanodeofsolidoxidefuelcellbasedonfickslaw
_version_	1718407580000190464

Determination of effective binary diffusivity in anode of solid oxide fuel cell based on Fick’s law

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