Study on durability of novel core-shell-structured La0.8Sr0.2Co0.2Fe0.8O3-δ@Gd0.2Ce0.8O1.9 composite materials for solid oxide fuel cell cathodes

被引：28

作者：

Li, Dong ^{[1
]}

Zhang, Xuebai ^{[1
]}

Liang, Chaoyu ^{[2
]}

Jin, Yingmin ^{[1
]}

Fu, Mengyu ^{[1
]}

Yuan, Jinliang ^{[2
]}

Xiong, Yueping ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Chem & Chem Engn, Harbin 150001, Peoples R China

[2] Ningbo Univ, Fac Maritime & Transportat, Ningbo 315211, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 55期

关键词：

Durability; Sr surface segregation; Molecular dynamics simulation; Solid oxide fuel cell; SR SURFACE SEGREGATION; TEMPERATURE; STABILITY; LA0.6SR0.4CO0.2FE0.8O3; MICROSTRUCTURE; SIMULATIONS; PERFORMANCE; DIFFUSION; BEHAVIOR; SIZE;

D O I：

10.1016/j.ijhydene.2021.06.031

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Core-shell-structured La0.8Sr0.2Co0.2Fe0.8O3-delta@Gd0.2Ce0.8O1.9 (LSCF@GDC) composite materials are synthesized and sintered as the SOFC cathodes by screen-printing method. The durability of core-shell-structured LSCF@GDC composite cathodes are evaluated through constant current polarizations (CCP) process at 750 degrees C and the results indicate that the core-shell-structured LSCF@GDC composite cathode (nanorod, 0.6) possesses an excellent long-term stability. In addition, molecular dynamics (MD) model is developed and applied to simulate the interaction between LSCF and GDC particles. According to the simulation results, compressive stress is generated at the cathode-electrolyte interface by the coated GDC layer. Combining with the X-ray diffraction (XRD) refinement results, it's revealed that the lattice strains are introduced in LSCF lattices because of the compressive stress. Furthermore, XPS results show that the core-shell-structured LSCF@GDC composite cathode (nanorod, 0.6) possess a better inhibition ability for Sr surface segregation. This study provides a possible way to suppress Sr surface segregation. (C) 2021 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.

引用

页码：28221 / 28231

页数：11

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