High-performance bilayered electrolyte intermediate temperature solid oxide fuel cells

Ahn, Jin-Soo; Pergolesi, Daniele; Camaratta, Matthew; Yoon, Heesung; Lee, Byung Wook; Lee, Jun Young; Jung, Doh Won; Traversa, Enrico; Wachsman, Eric D.

doi:10.1016/j.elecom.2009.05.041

Cited by 119 publications

(75 citation statements)

References 21 publications

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“…The comparison of these two results shows how the cathode plays a critical role in improving the performance of SOFCs. Therefore, besides developing more protonic SOFCs, deeper investigations on cathode materials might help boosting the performance of protonic SOFCs, which is still quite poor compared with that of SOFCs based on oxygen-ion conducting electrolytes [89].…”

Section: Present Performance Of Proton Conducting Sofcs and Future Gumentioning

confidence: 99%

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

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132

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High temperature proton conductor (HTPC) oxides are attracting extensive attention as electrolyte materials alternative to oxygen-ion conductors for use in solid oxide fuel cells (SOFCs) operating at intermediate temperatures (400-700• C). The need to lower the operating temperature is dictated by cost reduction for SOFC pervasive use. The major stake for the deployment of this technology is the availability of electrodes able to limit polarization losses at the reduced operation temperature. This review aims to comprehensively describe the state-of-the-art anode and cathode materials that have so far been tested with HTPC oxide electrolytes, offering guidelines and possible strategies to speed up the development of protonic SOFCs.

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Section: Present Performance Of Proton Conducting Sofcs and Future Gumentioning

confidence: 99%

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

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132

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“…Considering the relatively low cost and facile fabrication technique used, the electrochemical performance in this work has its particular advantages. Although Ahn et al 18 reported it that the GDC|ESB bilayer electrolyte cell achieved the MPD of 1.95 W cm -2 at 650 °C, it has no low temperature performance down to 450 °C given, and many other works report the cell performance at similar conditions. 1, 3,6 Noticeably, the SNDC|ESB bilayer structure cell in this assignment has the largest power output below 550 °C compared with the performance of anode-supported cells with ceria-bismuth bilayer electrolytes reported in literature as summarized in Table 1, such as GDC|ESB (88 mW cm -2 at 450 °C), 23 SDC|YSB (223 mW cm -2 at 500 °C) 17 and SDC|YSB (153 mW cm -2 at 550 °C) 2 .…”

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confidence: 99%

“…In order to evaluate SNDC|ESB bilayer film for HPLT-SOFCs, button cells using NiO-SNDC as anode and SNDC|ESB bilayer film as electrolyte with ESB-LBSM cathode was fabricated and measured under conventional conditions (humidified hydrogen as the fuel gas; static air as the oxidant). The typical I-V and power density curves for the single cell NiO-SNDC|SNDC|ESB|ESB-LBSM at 450-650 °C is shown in Figure 3 18 and SDC|YSB (0.887 V at 500 °C) 17 . Moreover, the current relsuts show higher MPDs than many ceria-bismuth bilayer electrolytes reports, such as SDC|YSB (571 mW cm -2 at 600 °C), 17 SDC|YSB (381 mW cm -2 at 650 °C), 2 GDC|ESB (588 mW cm -2 at 650 °C), 3 GDC|ESB (667 mW cm -2 at 600 °C) 23 .…”

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confidence: 99%

High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

Hou

Qian

et al. 2015

J. Mater. Chem. A

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This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available.You can find more information about Accepted Manuscripts in the Information for Authors.Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. Isovalent cation stabilized bismuth oxides (SBO) are particularly attractive because of their superior ionic conductivity at LTs, which is about 1-2 orders of magnitude higher than those of zirconia-based electrolytes. 1,[5][6][7][8] However, bismuth-based materials could decompose to metallic bismuth in the presence of the reducing gas such as H 2 or CH 4 .9 Therefore, they could not be used at the fuel side which makes it a poor choice by itself as an electrolyte for SOFCs. In contrast, the bismuth-based materials can be exposed to the air side since it is intended to be a pure oxide ionic conductor and thermodynamically stable under oxygen partial pressure down to 10 -13 atm. 2,6,10,11 To date, many works were focused on the ceria-based electrolytes to lower the operating temperature.4, 12-14 Virkar et al 15,16 have pioneeringly proposed a two-layer fuel cell electrolyte structure with YSZ used as a blocking layer to prevent ceria reduction, and a doped ceria (DCO) layer on the reducing side to improve the thermodynamic stability of the bismuth oxide layer, by shielding it from very low 2 O P .Several studies have demonstrated that the electrochemical properties of ceria-based SOFCs can be effectively improved using the ceria/bismuth oxide bilayer electrolyte structure. 1-3, 5-7, 10, 17-20 Though various fabrication methods were employed for ceria-bismuth bilayer electrolyte cells, such as spin coating, DC (Direct Current) magnetron sputtering, pulsed laser deposition (PLD) and so on, 2, 3, 6, 17, 18 most of which required advanced small-scale techniques and the operating temperature was relative high above 550 °C. Therefore, the low cost fabrication of SBO electrolyte film fuel cells with reasonable performance at LT down to 450 °C still remains a challenge. Furthermore, limited compatible cathodes for the ceria-bismuth bilayer electrolyte cells were developed, though Ahn et al 18 exploited the cathode Er 0.4 Bi 1.6 O 3 -Bi 2 Ru 2 O 7 (ESB-BRO7) for GDC|ESB bilayer electrolyte and achieved very high electrochemical performance, which contains the noble metallic element Ru. Then seeking new low cost cathode materials for ceria-bismuth bilayer electrolyte is imperative. Here a simple low cost fabrication technique combining one-step copressing with drop-coating was developed for the anode-DCO-SBO...

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“…12 Additionally, doped ceria is being investigated as the solid electrolyte in intermediate to low temperature SOFCs, where the non-stoichiometry induced chemical expansion can lead to mechanical failure. 13 Recently, we studied the origin of chemical expansion in CeO 2Àd 10,14 (relying on Shannon's ionic radii, a valid assumption for this system 15 ), and found that upon reduction (increase in d), chemical expansion arises from two competing mechanisms: (1) an increase in lattice volume upon increase in Ce radius (i.e. Ce 4+ -Ce 3+ ) and (2) a decrease in lattice volume with the formation of charge compensating oxygen vacancies.…”

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confidence: 99%

Charge localization increases chemical expansion in cerium-based oxides

Marrocchelli

Bishop

Tuller

et al. 2012

Phys. Chem. Chem. Phys.

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In this work, we demonstrate the mechanism by which electronic charge localization increases the chemical expansion coefficient in two model systems, CeO 2Àd and BaCeO 3Àd . Using Density Functional Theory calculations, we predict that this coefficient is increased by more than 70% when charge is fully localized, consistent with the observation that materials with a smaller degree of charge localization have smaller chemical expansion coefficients. This finding has important consequences for devising materials with smaller chemical expansion coefficients and for the reliability of the widely-used Shannon's ionic radii.

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High-performance bilayered electrolyte intermediate temperature solid oxide fuel cells

Cited by 119 publications

References 21 publications

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

Charge localization increases chemical expansion in cerium-based oxides

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