In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

Antonin Faes; Quentin Jeangros; Jakob Birkedal Wagner; Thomas Willum Hansen; Jan Van Herle; Annabelle Brisse; Rafal E. Dunin-Borkowski; Aïcha Hessler-Wyser

doi:10.1149/1.3205743

In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

Antonin Faes, Quentin Jeangros, Jakob Birkedal Wagner, Thomas Willum Hansen, Jan Van Herle, Annabelle Brisse, Rafal E. Dunin-Borkowski, Aïcha Hessler-Wyser

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Abstract

Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500{degree sign}C. The reduction is done under low hydrogen pressure. The reduction initiates at the NiO/YSZ interface, then moves to the center of the NiO grain. At higher temperature the reduction occurs also at the free NiO surface and the NiO/NiO grain boundaries. The growth of Ni is epitaxial on its oxide. Due to high volume decrease, nanopores are formed during reduction. During oxidation, oxide nanocrystallites are formed on the nickel surface. The crystallites fill up the nickel porosity and create an inhomogeneous structure with remaining voids. This change in structure causes the nickel oxide to expand during a RedOx cycle.

Original language	English
Journal	E C S Transactions
Volume	25
Issue number	2
Pages (from-to)	1985-1992
ISSN	1938-5862
DOIs	https://doi.org/10.1149/1.3205743
Publication status	Published - 2009
Event	216th ECS Meeting: 11th International Symposium B10 - Solid Oxide Fuel Cells - Vienna, Austria Duration: 4 Oct 2009 → 9 Oct 2009 Conference number: 216

Conference

Conference	216th ECS Meeting
Number	216
Country/Territory	Austria
City	Vienna
Period	04/10/2009 → 09/10/2009

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Copyright The Electrochemical Society, Inc. [2009]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

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title = "In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope",

abstract = "Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500{degree sign}C. The reduction is done under low hydrogen pressure. The reduction initiates at the NiO/YSZ interface, then moves to the center of the NiO grain. At higher temperature the reduction occurs also at the free NiO surface and the NiO/NiO grain boundaries. The growth of Ni is epitaxial on its oxide. Due to high volume decrease, nanopores are formed during reduction. During oxidation, oxide nanocrystallites are formed on the nickel surface. The crystallites fill up the nickel porosity and create an inhomogeneous structure with remaining voids. This change in structure causes the nickel oxide to expand during a RedOx cycle.",

author = "Antonin Faes and Quentin Jeangros and Wagner, {Jakob Birkedal} and Hansen, {Thomas Willum} and {Van Herle}, Jan and Annabelle Brisse and Dunin-Borkowski, {Rafal E.} and A{\"i}cha Hessler-Wyser",

note = "Copyright The Electrochemical Society, Inc. [2009]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).; 216th ECS Meeting : 11th International Symposium B10 - Solid Oxide Fuel Cells, SOFC-XI ; Conference date: 04-10-2009 Through 09-10-2009",

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doi = "10.1149/1.3205743",

language = "English",

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T1 - In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

AU - Faes, Antonin

AU - Jeangros, Quentin

AU - Wagner, Jakob Birkedal

AU - Hansen, Thomas Willum

AU - Van Herle, Jan

AU - Brisse, Annabelle

AU - Dunin-Borkowski, Rafal E.

AU - Hessler-Wyser, Aïcha

N1 - Conference code: 216

PY - 2009

Y1 - 2009

N2 - Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500{degree sign}C. The reduction is done under low hydrogen pressure. The reduction initiates at the NiO/YSZ interface, then moves to the center of the NiO grain. At higher temperature the reduction occurs also at the free NiO surface and the NiO/NiO grain boundaries. The growth of Ni is epitaxial on its oxide. Due to high volume decrease, nanopores are formed during reduction. During oxidation, oxide nanocrystallites are formed on the nickel surface. The crystallites fill up the nickel porosity and create an inhomogeneous structure with remaining voids. This change in structure causes the nickel oxide to expand during a RedOx cycle.

AB - Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500{degree sign}C. The reduction is done under low hydrogen pressure. The reduction initiates at the NiO/YSZ interface, then moves to the center of the NiO grain. At higher temperature the reduction occurs also at the free NiO surface and the NiO/NiO grain boundaries. The growth of Ni is epitaxial on its oxide. Due to high volume decrease, nanopores are formed during reduction. During oxidation, oxide nanocrystallites are formed on the nickel surface. The crystallites fill up the nickel porosity and create an inhomogeneous structure with remaining voids. This change in structure causes the nickel oxide to expand during a RedOx cycle.

U2 - 10.1149/1.3205743

DO - 10.1149/1.3205743

M3 - Conference article

VL - 25

SP - 1985

EP - 1992

JO - ECS Transactions

JF - ECS Transactions

SN - 1938-5862

IS - 2

T2 - 216th ECS Meeting

Y2 - 4 October 2009 through 9 October 2009

ER -

In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

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