期刊
NANO LETTERS
卷 16, 期 1, 页码 512-518出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04160
关键词
Cathode material; oxygen reduction reaction; perovskite; silver nanoparticle; solid oxide fuel cell
类别
资金
- Nature Science Foundation of Jiangsu Province [BK2011030]
- National Nature Science Foundation of China [21576135]
- Educational Commission of Jiangsu Province of China [13KJA430004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Program for Jiangsu Specially-Appointed Professors
- Youth Fund in Jiangsu Province [ZX15551310007]
- US Department of Energy ARPA-E REBELS Program [DE-AR0000502]
Solid oxide fuel cells (SOFCs) have potential to be the cleanest and most efficient electrochemical energy conversion devices with excellent fuel flexibility. To make SOFC systems more durable and economically competitive, however, the operation temperature must be significantly reduced, which depends sensitively on the development of highly active electrocatalysts for oxygen reduction reaction (ORR) at low temperatures. Here we report a novel silver nanoparticle-decorated perovskite oxide, prepared via a facile exsolution process from a Sr0.95Ag0.05Nb0.1Co0.9O3-delta (SANC) perovskite precursor, as a highly active and robust ORR electrocatalyst for low-temperature SOFCs. The exsolved Sr0.95Ag0.05Nb0.1Co0.9O3-delta (denoted as e-SANC) electrode is very active for ORR, achieving a very low area specific resistance (similar to 0.214 Omega cm(2) at 500 degrees C). An anode-supported cell with the new heterostructured cathode demonstrates very high peak power density (1116 mW cm(-2) at 500 degrees C) and stable operation for 140 h at a current density of 625 mA cm(-2). The superior ORR activity and stability are attributed to the fast oxygen surface exchange kinetics and the firm adhesion of the Ag nanoparticles to the Sr0.95Nb0.1Co0.9O3-delta (SNC0.95) support. Moreover, the e-SANC cathode displays improved tolerance to CO2. These unique features make the new heterostructured material a highly promising cathode for low-temperature SOFCs.
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