Three-phase-boundary dynamics at the Ni/ScYSZ interface

Michael Stenbæk Schmidt; Karin Vels Hansen; Kion Norrman; Mogens Bjerg Mogensen

doi:10.1016/j.ssi.2009.01.017

Three-phase-boundary dynamics at the Ni/ScYSZ interface

Michael Stenbæk Schmidt, Karin Vels Hansen, Kion Norrman, Mogens Bjerg Mogensen

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Chronoamperometry using a three-electrode cell configuration was undertaken with a nickel point-electrode acting as the working electrode on a polished ScYSZ electrolyte in a hydrogen atmosphere at 750–850 °C. High anodic overpotentials resulted in the occurrence of distinct sawtooth oscillation patterns in the measured current signal. The current oscillations indicated that a dynamic electrode process was taking place. Decreasing the water content in the measurement atmosphere as well as lowering the applied anodic overpotential had the effect of lowering the frequency and the amplitude of the current oscillations. A mechanism accounting for the observed phenomena and possible implications for solid oxide fuel cell operation are presented

Original language	English
Journal	Solid State Ionics
Volume	180
Issue number	4-5
Pages (from-to)	431-438
ISSN	0167-2738
DOIs	https://doi.org/10.1016/j.ssi.2009.01.017
Publication status	Published - 2009

Keywords

Solid Oxide Fuel Cells
Fuel Cells and hydrogen

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10.1016/j.ssi.2009.01.017

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title = "Three-phase-boundary dynamics at the Ni/ScYSZ interface",

abstract = "Chronoamperometry using a three-electrode cell configuration was undertaken with a nickel point-electrode acting as the working electrode on a polished ScYSZ electrolyte in a hydrogen atmosphere at 750–850 °C. High anodic overpotentials resulted in the occurrence of distinct sawtooth oscillation patterns in the measured current signal. The current oscillations indicated that a dynamic electrode process was taking place. Decreasing the water content in the measurement atmosphere as well as lowering the applied anodic overpotential had the effect of lowering the frequency and the amplitude of the current oscillations. A mechanism accounting for the observed phenomena and possible implications for solid oxide fuel cell operation are presented",

keywords = "Solid Oxide Fuel Cells, Fuel Cells and hydrogen, Br{\ae}ndselsceller og brint",

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year = "2009",

doi = "10.1016/j.ssi.2009.01.017",

language = "English",

volume = "180",

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TY - JOUR

T1 - Three-phase-boundary dynamics at the Ni/ScYSZ interface

AU - Schmidt, Michael Stenbæk

AU - Hansen, Karin Vels

AU - Norrman, Kion

AU - Mogensen, Mogens Bjerg

PY - 2009

Y1 - 2009

N2 - Chronoamperometry using a three-electrode cell configuration was undertaken with a nickel point-electrode acting as the working electrode on a polished ScYSZ electrolyte in a hydrogen atmosphere at 750–850 °C. High anodic overpotentials resulted in the occurrence of distinct sawtooth oscillation patterns in the measured current signal. The current oscillations indicated that a dynamic electrode process was taking place. Decreasing the water content in the measurement atmosphere as well as lowering the applied anodic overpotential had the effect of lowering the frequency and the amplitude of the current oscillations. A mechanism accounting for the observed phenomena and possible implications for solid oxide fuel cell operation are presented

AB - Chronoamperometry using a three-electrode cell configuration was undertaken with a nickel point-electrode acting as the working electrode on a polished ScYSZ electrolyte in a hydrogen atmosphere at 750–850 °C. High anodic overpotentials resulted in the occurrence of distinct sawtooth oscillation patterns in the measured current signal. The current oscillations indicated that a dynamic electrode process was taking place. Decreasing the water content in the measurement atmosphere as well as lowering the applied anodic overpotential had the effect of lowering the frequency and the amplitude of the current oscillations. A mechanism accounting for the observed phenomena and possible implications for solid oxide fuel cell operation are presented

KW - Solid Oxide Fuel Cells

KW - Fuel Cells and hydrogen

KW - Brændselsceller og brint

U2 - 10.1016/j.ssi.2009.01.017

DO - 10.1016/j.ssi.2009.01.017

M3 - Journal article

SN - 0167-2738

VL - 180

SP - 431

EP - 438

JO - Solid State Ionics

JF - Solid State Ionics

IS - 4-5

ER -

Three-phase-boundary dynamics at the Ni/ScYSZ interface

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