Nb and Pd co-doped La0.57Sr0.38Co0.19Fe0.665Nb0.095Pd0.05O3-δ as a stable, high performance electrode for barrier-layer-free Y2O3-ZrO2 electrolyte of solid oxide fuel cells

Kongfa Chen; Shuai He; Na Li; Yi Cheng; Na Ai; Minle Chen; William D A Rickard; Teng Zhang; San Ping Jiang

doi:10.1016/j.jpowsour.2017.12.066

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Nb and Pd co-doped La0.57Sr0.38Co0.19Fe0.665Nb0.095Pd0.05O3-δ as a stable, high performance electrode for barrier-layer-free Y2O3-ZrO2 electrolyte of solid oxide fuel cells

Journal article

Peer reviewed

Nb and Pd co-doped La0.57Sr0.38Co0.19Fe0.665Nb0.095Pd0.05O3-δ as a stable, high performance electrode for barrier-layer-free Y2O3-ZrO2 electrolyte of solid oxide fuel cells

Kongfa Chen, Shuai He, Na Li, Yi Cheng, Na Ai, Minle Chen, William D A Rickard, Teng Zhang and San Ping Jiang

Journal of Power Sources, Vol.378, pp.433-442

2018

DOI: https://doi.org/10.1016/j.jpowsour.2017.12.066

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Abstract

intermediate temperature solid oxide fuel cells

in operando electrode/electrolyte interface formation

Nb and Pd co-doping

exsolution of Pd/PdO nanoparticles

LSCF cathodes

La0.6Sr0.2Co0.2Fe0.8O3-δ (LSCF) is the most intensively investigated high performance cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs), but strontium segregation and migration at the electrode/electrolyte interface is a critical issue limiting the electrocatalytic activity and stability of LSCF based cathodes. Herein, we report a Nb and Pd co-doped LSCF (La0.57Sr0.38Co0.19Fe0.665Nb0.095Pd0.05O3-δ, LSCFNPd) perovskite as stable and active cathode on a barrier-layer-free anode-supported yttria-stabilized zirconia (YSZ) electrolyte cell using direct assembly method without pre-sintering at high temperatures. The cell exhibits a peak power density of 1.3 W cm-2 at 750°C and excellent stability with no degradation during polarization at 500 mA cm-2 and 750°C for 175 h. Microscopic and spectroscopic analysis show that the electrochemical polarization promotes the formation of electrode/electrolyte interface in operando and exsolution of Pd/PdO nanoparticles. The Nb doping in the B-site of LSCF significantly reduces the Sr surface segregation, enhancing the stability of the cathode, while the exsoluted Pd/PdO nanoparticles increases the electrocatalytic activity for the oxygen reduction reaction. The present study opens up a new route for the development of cobaltite-based perovskite cathodes with high activity and stability for barrier-layer-free YSZ electrolyte based IT-SOFCs.

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Title: Nb and Pd co-doped La0.57Sr0.38Co0.19Fe0.665Nb0.095Pd0.05O3-δ as a stable, high performance electrode for barrier-layer-free Y2O3-ZrO2 electrolyte of solid oxide fuel cells
Authors: Kongfa Chen (Author) - Fuzhou University, China
Shuai He (Author) - Curtin University
Na Li (Author) - Curtin University
Yi Cheng (Author) - Curtin University
Na Ai (Author) - Fuzhou University, China
Minle Chen (Author) - Fuzhou University, China
William D A Rickard (Author) - Curtin University
Teng Zhang (Author) - Fuzhou University, China
San Ping Jiang (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Journal of Power Sources, Vol.378, pp.433-442
Publisher: Elsevier BV
Date published: 2018
DOI: 10.1016/j.jpowsour.2017.12.066
ISSN: 0378-7753
Grants: Oxide-based high temperature proton exchange membrane fuel cells, DP150102025, Australian Research Council (Australia, Canberra) - ARC
A surface characterisation facility, LE120100026, Australian Research Council (Australia, Canberra) - ARC
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99451369002621
Output Type: Journal article

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Web Of Science research areas: Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary

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