A new cathode for solid oxide fuel cells capable of in situ electrochemical regeneration

Zhou, Wei and Shao, Zongping and Liang, Fengli and Chen, Zhi-Gang and Zhu, Zhonghua and Jin, Wanqin and Xu, Nanping (2011) A new cathode for solid oxide fuel cells capable of in situ electrochemical regeneration. Journal of Materials Chemistry, 21 (39). pp. 15343-15351. ISSN 0959-9428

Abstract

As highly efficient energy conversion devices with the capability for power/heat co-generation and fuel flexibility, solid-oxide fuel cells (SOFCs) have received considerable attention recently as a keystone of the future energy economy. Nowadays, lack of a proper cathode with high performance at intermediate temperature (IT) has become the main obstacle in realizing this fascinating technology. Here we present (La0.8Sr0.2) 0.95Ag0.05MnO3-δ as a novel CO 2 tolerant cathode of IT-SOFCs, which shows silver intercalation/de-intercalation capability. Under cathodic polarization, silver can be extracted from perovskite lattice to form a 5-15 nm silver modified A-site cation deficient (La0.8Sr0.2) 0.95MnO3-δ electrode with superior electrocatalytic activity and improved stability. Any performance degradation due to silver sintering can be easily in situ restored by re-intercalating silver into the perovskite lattice under anodic polarization. Through electrochemically adjusting the oxidation state and location of silver, we introduce a way for the development of high-performance silver-modified cathode for IT-SOFCs, which may contribute significantly to a sustainable future.


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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: 14 Jun 2017 01:35
Last Modified: 14 Jun 2017 01:35
Uncontrolled Keywords: a-site cations; co-generation; electrocatalytic activity; electrochemical regeneration; energy conversion devices; energy economy; fuel flexibility; in-situ; intermediate temperatures; IT-SOFCs; oxidation state; performance degradation; perovskite lattice; inorganic compounds; chemical products generally; electrochemistry; physical chemistry; electric components; fuel cells; electric batteries; precious metals; powder metallurgy operations; energy conversion; fuel combustion and flame research
Fields of Research : 03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030604 Electrochemistry
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1039/c1jm12660a
URI: http://eprints.usq.edu.au/id/eprint/31732

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