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Sintering behavior and electrochemical performances of nano-sized gadolinium-doped ceria via ammonium carbonate assisted co-precipitation for solid oxide fuel cells

Title
Sintering behavior and electrochemical performances of nano-sized gadolinium-doped ceria via ammonium carbonate assisted co-precipitation for solid oxide fuel cells
Authors
Joh, DW[Joh, Dong Woo]Rath, MK[Rath, Manasa K.]Park, JW[Park, Jin Wan]Park, JH[Park, Jeong Hwa]Cho, KH[Cho, Ki Hyun]Lee, S[Lee, Seunghwan]Yoon, KJ[Yoon, Kyung Joong]Lee, JH[Lee, Jong-Ho]Lee, KT[Lee, Kang Taek]
DGIST Authors
Joh, DW[Joh, Dong Woo]; Rath, MK[Rath, Manasa K.]; Park, JW[Park, Jin Wan]; Park, JH[Park, Jeong Hwa]; Lee, KT[Lee, Kang Taek]
Issue Date
2016-10-15
Citation
Journal of Alloys and Compounds, 682, 188-195
Type
Article
Article Type
Article
Keywords
CarbonatesCathodesCo-PrecipitationConductivity MeasurementsCoprecipitationCrystallite SizeDoped CeriaElectro-Chemical Impedance Spectroscopy (EIS)Electrochemical PerformanceElectrolytic ReductionFuel CellsGrain BoundariesGrain Boundary ResistanceIonic Conduction In SolidsIonic ConductivityLower Sintering TemperaturesOxygen Reduction ReactionPowdersRelative Density MeasurementSinterabilitySinteringSolid Oxide Fuel Cells (SOFC)
ISSN
0925-8388
Abstract
Ultra-fine Gd-doped ceria (GDC) powders were synthesized via co-precipitation using ammonium carbonate as the precipitant. The crystallite size of the resultant GDC powders was measured as ∼33 nm. The dilatometry test of the powder compacts and the relative density measurement of sintered pellets with various sintering temperatures revealed the synthesized nano-GDC powders had superior sinterability compared to commercial GDC powders (e.g., 96% vs 78% in relative density at 1300 °C, respectively). Based on the total conductivity measurement of the co-precipitated GDC via electrochemical impedance spectroscopy, we found there was an optimum sintering temperature range (1300-1400 °C) to achieve both high density and high conductivity due to significant increase in grain boundary resistance at higher temperature (1500 °C). Moreover, the nano-sized and highly sinterable co-precipitated GDC effectively enhanced oxygen reduction reaction at the La0.6Sr0.4Co0.2Fe0.8O3-δ/GDC composite cathode due to increase in active reaction sites as well as enhanced phase connectivity in 3D-bulk at lower sintering temperatures. © 2016 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2172
DOI
10.1016/j.jallcom.2016.04.270
Publisher
Elsevier
Related Researcher
  • Author Lee, Kang Taek Advanced Energy Conversion and Storage Lab(AECSL)
  • Research Interests
Files:
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Collection:
Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles


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