SrCo0.8Ti0.1Ta0.1O3-δ perovskite: A new highly active and durable cathode material for intermediate-temperature solid oxide fuel cells

SrCo0.8Ti0.1Ta0.1O3-δ perovskite: A new highly active and durable cathode material for intermediate-temperature solid oxide fuel cells

Reducing the operating temperatures of solid oxide fuel cells (SOFCs) to the intermediate-temperature range (IT, 400–650 °C) can bring about several benefits including cost effectiveness, prolonged lifetime and flexible sealing. Nevertheless, the accompanying deterioration of cathodic activity for o...

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Bibliographic Details
Main Authors: Gu, H., Xu, M., Song, Y., Zhou, C., Su, Chao, Wang, Wei, Ran, R., Zhou, W., Shao, Zongping
Format: Journal Article
Language:English
Published: ELSEVIER SCI LTD 2021
Subjects:
Science & Technology
Technology
Engineering, Multidisciplinary
Materials Science, Composites
Engineering
Materials Science
Solid oxide fuel cell
Perovskite oxide
Co-doping
Cathode
Oxygen reduction
CO-DOPED PEROVSKITE
OXYGEN REDUCTION REACTION
HIGH-PERFORMANCE CATHODE
CRYSTAL-STRUCTURE
SURFACE EXCHANGE
ELECTRONEGATIVITY
DIFFUSION
EFFICIENT
ELECTROCATALYSTS
SRCOO3-DELTA
Online Access:http://purl.org/au-research/grants/arc/DP150104365
http://hdl.handle.net/20.500.11937/91962
Description
Summary:Reducing the operating temperatures of solid oxide fuel cells (SOFCs) to the intermediate-temperature range (IT, 400–650 °C) can bring about several benefits including cost effectiveness, prolonged lifetime and flexible sealing. Nevertheless, the accompanying deterioration of cathodic activity for oxygen reduction reaction (ORR) introduces a large obstacle for commercial applications of IT-SOFCs. Herein, a new perovskite SrCo0.8Ti0.1Ta0.1O3-δ (SCTT) is developed by co-doping titanium and tantalum into the B-site of parent SrCoO3 oxide, which may tackle this problem. At 400–650 °C, SCTT shows high electrical conductivities (65–142 S cm−1), appropriate oxygen vacancy concentrations (0.23–0.27) and high bulk diffusion capability due to a synergy between the two dopants in SCTT. Consequently, SCTT exhibits a favorable ORR activity with an area-specific resistance of only 0.17 Ω cm2 at 500 °C on samaria-doped ceria electrolyte, and the corresponding cell generates a high peak power density (PPD) of 0.90 W cm−2 at 500 °C with negligible performance decay for 180 h. Additionally, SCTT performs well in protonic ceramic fuel cells, achieving a PPD of 0.78 W cm−2 at 650 °C and a high durability for ~176 h at 550 °C. This work provides a new promising cathode material that may accelerate the commercialization of IT-SOFC technology.

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