Stable High Conductivity Ceria/Bismuth Oxide Bilayered Electrolytes

Wachsman, Eric D.; Jayaweera, Palitha; Jiang, Nancy; Lowe, D. M.; Pound, Bruce G.

doi:10.1149/1.1837390

Cited by 111 publications

(79 citation statements)

References 1 publication

(1 reference statement)

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“…The density of the film depends on the sintering schedule and the stability of the sol. The cell performance was comparable to those reported in the literature [5,14]. The cathode performance needs improvement and we are developing new cathodes to address this.…”

Section: Resultssupporting

confidence: 73%

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Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Wachsman¹,

Duncan²

2002

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Section: Resultssupporting

confidence: 73%

“…operation under both open circuit and maximum power conditions [5]. More recently, we developed an analytical model to determine the defect transport in this bilayer and have found that a bilayer comprised primarily of the more conductive component (bismuth oxide) is stable for 500°C operation [6,7].…”

Section: Esb Decomposesmentioning

confidence: 99%

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Wachsman¹,

Duncan²

2002

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“…We demonstrated previously that this concept works; that a bismuth oxide/ceria bilayer electrolyte provides near theoretical open circuit potential (OCP) and is stable for 1400 h of fuel cell operation under both open circuit and maximum power conditions [5]. In this project we extended the demonstration of the concept significantly, as described below.…”

Section: Esb Decomposesmentioning

confidence: 88%

“…Table 4. [2][3][4][5][6][7][8] shows that the difference between the jump distances of ordered and disordered structures is highest for Yb and Er doped structures, and lowest for the Dy doped structures. This clearly is consistent with the difference in kinetics of aging for structures with different dopants.…”

Section: Effect Of Structure On Conductivity Pre-exponential Factormentioning

confidence: 99%

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Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Wachsman¹,

Duncan²

2002

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A bilayer electrolyte consisting of acceptor-doped ceria (on the fuel/reducing side) and cubicstabilized bismuth oxide (on the oxidizing side) was developed. The bilayer electrolyte that was developed showed significant improvement in open-circuit potential versus a typical ceria based SOFC. Moreover, the OCP of the bilayer cells increased as the thickness of the bismuth oxide layer increased relative to the ceria layer. Thereby, verifying the bilayer concept. Although, because of the absence of a suitable cathode (a problem we are still working assiduously to solve), we were unable to obtain power density curves, our modeling work predicts a reduction in electrolyte area specific resistance of two orders of magnitude over cubic-stabilized zirconia and projects a maximum power density of 9 W/m 2 at 800 °C and 0.09 W/m 2 at 500 °C.Towards the development of the bilayer electrolyte other significant strides were made. Among these were, first, the development of a, bismuth oxide based, oxide ion conductor with the highest conductivity (0.56 S/cm at 800 °C and 0.043 S/cm at 500 °C) known to date. Second, a physical model of the defect transport mechanisms and the driving forces for the ordering phenomena in bismuth oxide and other fluorite systems was developed. Third, a model for point defect transport in oxide mixed ionic-electronic conductors was developed, without the typical assumption of a uniform distribution of ions and including the effect of variable loads on the transport properties of an SOFC (with either a single or bilayer electrolyte).i CONTENTS

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Mitigating Electronic Conduction in Ceria‐Based Electrolytes via External Structure Design

Robinson,

Huang,

Horlick

et al. 2023

Adv Funct Materials

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Doped ceria electrolytes are the state of the art low‐temperature solid oxide electrolytes because of their high ionic conductivity and good material compatibility. However, cerium tends to reduce once exposed to reducing environments, leading to an increase in electronic conduction and a decrease in efficiency. Here, the leakage current is mitigated in ceria‐based electrolytes by controlling the defect chemistry through an engineered cathode side microstructure. This functional layer effectively addresses the problematic electronic conduction issue in ceria‐based electrolytes without adding significant ohmic resistance and increases the ionic transference number to over 0.93 in a thin 20 µm ceria‐based electrolyte at 500 °C, compared to a of 0.8 for an unmodified one. Based on this design, solid oxide fuel cells (SOFCs) are further demonstrated with the remarkable peak power density of 550 mW at 500 °C and excellent stability for over 2000 h. This approach enables a potential breakthrough in the development of ceria‐based low‐temperature solid oxide electrolytes.

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Stable High Conductivity Ceria/Bismuth Oxide Bilayered Electrolytes

Cited by 111 publications

References 1 publication

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Mitigating Electronic Conduction in Ceria‐Based Electrolytes via External Structure Design

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