화학공학소재연구정보센터
Journal of Power Sources, Vol.275, 151-158, 2015
Effects of strontium doping on the structure, oxygen nonstoichiometry and electrochemical performance of Pr2-xSrxNi0.6Cu0.4O4+delta (0.1 <= x <= 0.5) cathode materials
Pr2-xSrxNi0.6Cu0.4O4+delta (PSNCO, x = 0.1, 0.3, 0.5) oxides with K2NiF4-type structure are synthesized by a glycine-nitrate process as potential cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). The influence of strontium substitution on the structure, oxygen nonstoichiometry, electrical property and electrochemical performance is investigated. Iodometric titration method is employed to study the oxygen nonstoichiometry and the formal valence of nickel. The maximum electrical conductivity reaches 109 S cm(-1) at 450 degrees C in air for Pr1.7Sr0.3Ni0.6Cu0.4O4+delta material. Area specific resistance (ASR) values of all compositions are below 0.11 Omega cm(2) at 800 degrees C, and the Pr1.7Sr0.3Ni0.6Cu0.4O4+delta composition has the lowest ASR value of 0.063 Omega cm(2) at 800 degrees C. Open circuit voltage (OCV) and maximum power density of the single cell (NiO-SDC/SDC/PSNCO) are 0.767 V and 353 mW cm(-2) at 800 degrees C, respectively. The preliminary results indicate that Pr2-xSrxNi0.6Cu0.4O4+delta materials could be good candidates for IT-SOFCs cathode materials. (C) 2014 Elsevier B.V. All rights reserved.