Effective suppression of surface cation segregations on double perovskite oxides through entropy engineering  

作　　者：Zhe Wang Mengke Yuan Juntao Gao Hongru Hao Jingwei Li Lingling Xu Zhe Lv Bo Wei 

机构地区：[1]School of Physics,Harbin Institute of Technology,Harbin,150001,China [2]Faculty of Engineering,University of Bayreuth,95448,Bayreuth,Germany [3]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China [4]Key Laboratory of Photonic and Electric Band Gap Materials,Ministry of Education,School of Physics and Electronic Engineering,Harbin Normal University,Harbin,150025,China

出　　处：《Journal of Rare Earths》2025年第2期345-353,I0005,共10页稀土学报(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(22279025,21773048,52302119);the Fundamental Research Funds for the Central Universities(2023FRFK06005,HIT.NSRIF202204)。

摘　　要：Cation segregation on cathode surfaces plays a key role in determining the activity and operational stability of solid oxide fuel cells(SOFCs).The double perovskite oxide PrBa_(0.8)Ca_(0.2)Co_(2)O_(5+δ)(PBCC)has been widely studied as an active cathode but still suffer from serious detrimental segregations.To enhance the cathode stability,a PBCC derived A-site medium-entropy Pr_(0.6)La_(0.1)Nd_(0.1)Sm_(0.1)Gd_(0.1)Ba_(0.8)Ca_(0.2)Co_(2)O_(5+δ)(ME-PBCC)oxide was prepared and its segregation behaviors were investigated under different conditions.Compared with initial PBCC oxide,the segregations of BaO and Co_(3)O_(4)on the surface of ME-PBCC material are significantly suppressed,especially for Co_(3)O_(4),which is attributed to its higher configuration entropy.Our results also confirm the improved electrochemical performance and structural stability of ME-PBCC material,enabling it as a promising cathode for SOFCs.

关 键 词：Solid oxide fuel cells CATHODE Double perovskite Configuration entropy Cation segregation Rare earths 

分 类 号：TG1[金属学及工艺—金属学]