scholarly journals Compositional Engineering of a La1-xBaxCoO3-δ-(1-a) BaZr0.9Y0.1O2.95 (a = 0.6, 0.7, 0.8 and x = 0.5, 0.6, 0.7) Nanocomposite Cathodes for Protonic Ceramic Fuel Cells

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3441
Author(s):  
Laura Rioja-Monllor ◽  
Carlos Bernuy-Lopez ◽  
Marie-Laure Fontaine ◽  
Tor Grande ◽  
Mari-Ann Einarsrud
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Single Phase ◽  
Controlled Atmospheres ◽  
Composite Cathodes ◽  
Phase Precursor ◽  
One Step ◽  
Ceramic Fuel ◽  
Symmetrical Cell ◽  
Ceramic Fuel Cells

Compositionally engineered a La1-xBaxCoO3-δ-(1-a) BaZr0.9Y0.1O2.95 (a = 0.6, 0.7, 0.8 and x = 0.5, 0.6, 0.7) (LBZ) nanocomposite cathodes were prepared by oxidation driven in situ exsolution of a single-phase material deposited on a BaZr0.9Y0.1O2.95 electrolyte. The processing procedure of the cathode was optimized by reducing the number of thermal treatments as the single-phase precursor was deposited directly on the electrolyte. The exsolution and firing of the cathodes occurred in one step. The electrochemical performance of symmetrical cells with the compositionally engineered cathodes was investigated by impedance spectroscopy in controlled atmospheres. The optimized materials processing gave web-like nanostructured cathodes with superior electrochemical performance for all compositions. The area specific resistances obtained were all below 12 Ω·cm2 at 400 °C and below 0.59 Ω·cm2 at 600 °C in 3% moist synthetic air. The resistances of the nominal 0.6 La0.5Ba0.5CoO3-δ-0.4 BaZr0.9Y0.1O2.95 and 0.8 La0.5Ba0.5CoO3-δ-0.2 BaZr0.9Y0.1O2.95 composite cathodes were among the lowest reported for protonic ceramic fuel cells cathodes in symmetrical cell configuration with ASR equal to 4.04 and 4.84 Ω·cm2 at 400 °C, and 0.21 and 0.27 Ω·cm2 at 600 °C, respectively.

scholarly journals High-Performance La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr1−zYzO3−δ Cathode Composites via an Exsolution Mechanism for Protonic Ceramic Fuel Cells

Inorganics ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 83 ◽  
Author(s):  
Laura Rioja-Monllor ◽  
Sandrine Ricote ◽  
Carlos Bernuy-Lopez ◽  
Tor Grande ◽  
Ryan O’Hayre ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Performance ◽  
Single Phase ◽  
Composite Cathode ◽  
Nominal Composition ◽  
Composite Cathodes ◽  
Phase Precursor ◽  
Ceramic Fuel ◽  
Two Phases ◽  
Ceramic Fuel Cells

A novel exsolution process was used to fabricate complex all-oxide nanocomposite cathodes for Protonic Ceramic Fuel Cells (PCFCs). The nanocomposite cathodes with La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr1−zYzO3−δ nominal composition were prepared from a single-phase precursor via an oxidation-driven exsolution mechanism. The exsolution process results in a highly nanostructured and intimately interconnected percolating network of the two final phases, one proton conducting (BaZr1−zYzO3−δ) and one mixed oxygen ion and electron conducting (La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ), yielding excellent cathode performance. The cathode powder is synthesized as a single-phase cubic precursor by a modified Pechini route followed by annealing at 700 °C in N2. The precursor phase is exsolved into two cubic perovskite phases by further heat treatment in air. The phase composition and chemical composition of the two phases were confirmed by Rietveld refinement. The electrical conductivity of the composites was measured and the electrochemical performance was determined by impedance spectroscopy of symmetrical cells using BaZr0.9Y0.1O2.95 as electrolyte. Our results establish the potential of this exsolution method where a large number of different cations can be used to design composite cathodes. The La0.5Ba0.5Co1/3Mn1/3Fe1/3O3−δ-BaZr0.9Y0.1O2.95 composite cathode shows the best performance of 0.44 Ω∙cm2 at 600 °C in 3% moist synthetic air.

Electrochemical Performance of Anode-Supported Protonic Ceramic Fuel Cells with Various Composite Cathodes

2019 ◽  
Vol 91 (1) ◽  
pp. 1075-1083
Author(s):  
Hiroyuki Shimada ◽  
Toshiaki Yamaguchi ◽  
Yuki Yamaguchi ◽  
Yoshinobu Fujishiro ◽  
Yasunobu Mizutani
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Composite Cathodes ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

The rapid one-step fabrication of bilayer anode for protonic ceramic fuel cells by phase inversion tape casting

2020 ◽  
Vol 40 (8) ◽  
pp. 3104-3110
Author(s):  
Chaoliang Geng ◽  
Xinxi Yu ◽  
Piaopiao Wang ◽  
Jigui Cheng ◽  
Tao Hong
Keyword(s):  
Fuel Cells ◽  
Phase Inversion ◽  
Tape Casting ◽  
One Step ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

Catalysts for composite cathodes of protonic ceramic fuel cells

2018 ◽  
Vol 44 (7) ◽  
pp. 8423-8426 ◽  
Author(s):  
EunKyong Shin ◽  
Minho Shin ◽  
Hanjin Lee ◽  
Jong-Sung Park
Keyword(s):  
Fuel Cells ◽  
Composite Cathodes ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

scholarly journals One-Step Fabrication of Protonic Ceramic Fuel Cells Using a Convenient Tape Calendering Method

2020 ◽  
Vol 10 (7) ◽  
pp. 2481 ◽  
Author(s):  
Artem Tarutin ◽  
Nikolay Danilov ◽  
Julia Lyagaeva ◽  
Dmitry Medvedev
Keyword(s):  
Fuel Cells ◽  
Tape Casting ◽  
Cathode Layer ◽  
Electrode Layer ◽  
Fuel Cell Performance ◽  
One Step ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells ◽  
Convenient Preparation ◽  
Preparation Techniques

The present paper reports the preparation of multilayer protonic ceramic fuel cells (PCFCs) using a single sintering step. The success of this fabrication approach is due to two main factors: the rational choice of chemically and mechanically compatible components, as well as the selection of a convenient preparation (tape calendering) method. The PCFCs prepared in this manner consisted of a 30 µm BaCe0.5Zr0.3Dy0.2O3–δ (BCZD) electrolyte layer, a 500 μm Ni–BCZD supporting electrode layer and a 20 μm functional Pr1.9Ba0.1NiO4+δ (PBN)–BCZD cathode layer. These layers were jointly co-fired at 1350 °C for 5 h to reach excellent gas-tightness of the electrolyte and porous structures for the supported and functional electrodes. The adequate fuel cell performance of this PCFC design (400 mW cm−2 at 600 °C) demonstrates that the tape calendering method compares well with such conventional laboratory PCFC preparation techniques such as co-pressing and tape-casting.

Catalytic Surface Promotion of Composite Cathodes in Protonic Ceramic Fuel Cells

2015 ◽  
Vol 2 (8) ◽  
pp. 1106-1110 ◽  
Author(s):  
Cecilia Solís ◽  
Laura Navarrete ◽  
Francesco Bozza ◽  
Nikolaos Bonanos ◽  
José M. Serra
Keyword(s):  
Fuel Cells ◽  
Catalytic Surface ◽  
Composite Cathodes ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

A new oxygen reduction electrocatalyst of barium lanthanide cobaltate for composite cathodes of proton-conducting ceramic fuel cells

2018 ◽  
Vol 6 (29) ◽  
pp. 14188-14194 ◽  
Author(s):  
Toshiaki Matsui ◽  
Kohei Manriki ◽  
Kazunari Miyazaki ◽  
Hiroki Muroyama ◽  
Koichi Eguchi
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Proton Conducting ◽  
Composite Cathodes ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

A new oxygen reduction electrocatalyst of barium lanthanide cobaltate of Ba4Sr2Sm2Co4O15 (BSSC) for composite cathodes of proton-conducting ceramic fuel cells.

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