Tuning the high temperature properties of PrSrCoO4 cathode with Cu2+ dopant for intermediate temperature solid oxide fuel cells

RENEWABLE ENERGY

卷:159

Article

Liu, Jian-Wei¹  Li, Qiang¹  Sun, Li-Ping¹  Huo, Li-Hua¹  Zhao, Hui¹  Jean-Marc, Bassat²  Sebastien, Fourcade²  Jean-Claude, Grenier² 

[1] Heilongjiang Univ, Sch Chem & Mat Sci, Key Lab Funct Inorgan Mat Chem, Minist Educ, Harbin 150080, Peoples R China

[2] Univ Bordeaux, ICMCB, CNRS, 87 Ave Dr A Schweitzer, F-33608 Pessac, France

关键词: Solid oxide fuel cells (SOFCs);    K2NiF4 structure;    Cathode material;    Electrochemical properties;   

DOI  :  10.1016/j.renene.2020.06.032

来源: Elsevier

【 摘 要 】

PrSrCo(1-x)CuxO(4+delta) (x = 0.0, 0.1, 0.3, 0.5) are synthesized by solid-state reaction method. The effects of Cu2+ doping on electrical conductivity, thermal expansion, oxygen diffusion properties and oxygen reduction reaction (ORR) activity are investigated. PrSrCo1-xCuxO4+delta oxides crystallize in a single-phase tetragonal structure with I4/mmm space group. Partial substitution Co3+ by Cu2+ results the increase of electrical conductivity and decrease of thermal expansion coefficient. Introducing Cu2+ promotes the formation of interstitial oxygen, accelerates the kinetics of oxygen transport, and significantly improves the electrocatalytic activity of ORR. The lowest area specific resistance (ASR) value of 0.08 U cm(2) is obtained for the PrSrCo0.7Cu0.3O4+delta cathode at 700 degrees C in air. The ORR mechanism study demonstrates that Cu-doping (30%) promotes the charge transfer process. The reaction rate control step on PrSrCo0.7Cu0.3O4+delta cathode is the dissociation and surface diffusion process of adsorbed molecular oxygen. (c) 2020 Elsevier Ltd. All rights reserved.

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