Hits:

Indexed by:期刊论文

Date of Publication:2012-03-01

Journal:INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

Included Journals:SCIE、EI

Volume:37

Issue:5

Page Number:3998-4001

ISSN No.:0360-3199

Key Words:Solid oxide fuel cell; Cathode; PrBa0.92Co2O5+delta; Electrochemical performance

Abstract:An A-site Ba cation-deficient layered-perovskite oxide PrBa0.92Co2O5+delta (PB0.92CO) was evaluated as a new cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). PB0.92CO is chemically stable with Ce0.9Gd0.1O1.95 (GDC) electrolyte at temperatures up to 1100 degrees C. PB0.92CO has conductivities of 580-195 S cm(-1) at temperatures of 200-800 degrees C in air. Area specific resistances (ASR) of PB0.92CO cathode on the GDC electrolyte layer range from 0.093 Omega cm(2) at 600 degrees C to 0.0068 Omega cm(2) at 800 degrees C with an activation energy of 1.05 eV. These ASR values are much lower than the results of the parent PrBaCo2O5+delta (PBCO) cathode, cation-doped PBCO cathodes and the PBCO-based composite cathodes. The preliminary results have demonstrated that PB0.92CO has excellent electrochemical performances at temperatures of 600 degrees C-800 degrees C and is a very promising cathode material for IT-SOFCs. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.