An A-site-deficient perovskite offers high activity and stability for low-temperature solid-oxide fuel cells

Zhu, Yinlong and Chen, Zhi-Gang and Zhou, Wei and Jiang, Shanshan and Zou, Jin and Shao, Zongping (2013) An A-site-deficient perovskite offers high activity and stability for low-temperature solid-oxide fuel cells. ChemSusChem, 6 (12). pp. 2249-2254. ISSN 1864-5631

Abstract

Solid oxide fuel cells (SOFCs) directly convert fossil and/or renewable fuels into electricity and/or high-quality heat in an environmentally friendly way. However, high operating temperatures result in high cost and material issues, which have limited the commercialization of SOFCs. To lower their operating temperatures, highly active and stable cathodes are required to maintain a reasonable power output. Here, we report a layer-structured A-site deficient perovskite Sr0.95Nb0.1Co0.9O 3-δ (SNC0.95) prepared by solid-state reactions that shows not only high activity towards the oxygen reduction reaction (ORR) at operating temperatures below 600 °C, but also offers excellent structural stability and compatibility, and improved CO2 resistivity. An anode-supported fuel cell with SNC0.95 cathode delivers a peak power density as high as 1016mW cm-2 with an electrode-area-specific resistance of 0.052Ω cm2 at 500 °C. A site to be seen: The perovskite Sr 0.95Nb0.1Co0.9O3-δ (SNC0.95) with A-site deficiencies shows high activity towards the oxygen reduction reaction (ORR) at low operating temperatures due to its large oxygen vacancy concentration and high electrical conductivity. Moreover, SNC0.95 shows excellent structural stability and chemical compatibility‥ The CO2 resistivity is also improved. These merits show that SNC0.95 is a promising cathode material for low-temperature solid oxide fuel cells.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 20 Jun 2017 01:34
Last Modified: 27 Jun 2017 04:18
Uncontrolled Keywords: cathodes; fuel cells; oxygen reduction reaction; perovskites; solid-state reactions; high electrical conductivity; high operating temperature; Low operating temperature; Low-temperature solid oxide fuel cells; oxygen reduction reaction; oxygen vacancy concentration; solid oxide fuel cells (SOFCs); structural stabilities; cathodes; fuel cells; oxygen reduction reaction; perovskites; solid-state reactions; materials science; applied physics generally; ceramics; inorganic compounds; systems science; chemical reactions; electric components; fuel cells; thermodynamics; chemistry
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090405 Non-automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)
03 Chemical Sciences > 0399 Other Chemical Sciences > 039999 Chemical Sciences not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1002/cssc.201300694
URI: http://eprints.usq.edu.au/id/eprint/31707

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