Microstructural and Electrochemical Characterisation of Degradation in Nickel Impregnated Scandia-stabilised Zirconia Electrode during Isothermal Annealing
Author(s)
Chen, J
Ruiz-Trejo, E
Atkinson, A
Brandon, NP
Type
Conference Paper
Abstract
© The Electrochemical Society. In this study, we examine the degradation of nickel impregnated scandia-stabilised zirconia (ScSZ) electrode in wet hydrogen at a working temperature of SOFCs. Continuous van der Pauw measurement was carried out when the electrode was aged at 650oC in an atmosphere with 5 vol% hydrogen and 95 vol% nitrogen. A fall in sheet conductivity was found in the electrode during ageing within 1000 min. Electrochemical impedance spectra were collected at a constant time intervals during isothermal annealing at 650oC, 800oC and 950oC for the impregnated electrode, at open circuit. Three resistance contributions were decoupled by equivalent circuit fitting, i.e. the ohmic resistance, the anodic reaction resistance, and the gas diffusion resistance. Secondary electron images of electrodes before and after ageing showed an increase in nickel particle size and a decrease in the number of particles, providing microstructural evidence of coarsening. Nickel coarsening was identified as the main mechanism of degradation for the electrode in wet hydrogen.
Editor(s)
Singhal, SC
Kawada, T
Date Issued
2017-01-01
Date Acceptance
2016-12-30
Citation
SOLID OXIDE FUEL CELLS 15 (SOFC-XV), 2017, 78 (1), pp.1125-1137
ISBN
9781607685395
ISSN
1938-5862
Publisher
ELECTROCHEMICAL SOC INC
Start Page
1125
End Page
1137
Journal / Book Title
SOLID OXIDE FUEL CELLS 15 (SOFC-XV)
Volume
78
Issue
1
Copyright Statement
© 2017 ECS - The Electrochemical Society
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000432566702005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
EP/M014045/1
Source
15th International Symposium on Solid Oxide Fuel Cells (SOFC)
Subjects
Science & Technology
Physical Sciences
Technology
Electrochemistry
Energy & Fuels
OXIDE FUEL-CELLS
NI-YSZ CERMET
NI/YSZ CERMET
SOFC ANODE
IMPEDANCE
PERFORMANCE
DURABILITY
INFILTRATION
Publication Status
Published
Start Date
2017-07-23
Finish Date
2017-07-28
Coverage Spatial
Hollywood, FL