Suppressing the Surface Amorphization of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite toward Oxygen Catalytic Reactions by Introducing the Compressive Stress

Fuyue Liu; Xuyang Wu; Ran Guo; He Miao; Fu Wang; Chao Yang; Jinliang Yuan

doi:10.1021/acs.inorgchem.3c00158

Suppressing the Surface Amorphization of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ Perovskite toward Oxygen Catalytic Reactions by Introducing the Compressive Stress

Inorg Chem. 2023 Mar 13;62(10):4373-4384. doi: 10.1021/acs.inorgchem.3c00158. Epub 2023 Mar 2.

Authors

Fuyue Liu¹, Xuyang Wu², Ran Guo³, He Miao¹, Fu Wang¹, Chao Yang³, Jinliang Yuan¹

Affiliations

¹ Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, PR China.
² School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
³ Shanghai Frontiers Science Center of "Full Penetration" Far-reaching Offshore Ocean Energy and Power, Merchant Marine College, Shanghai Maritime University, Shanghai 200135, China.

PMID: 36862561
DOI: 10.1021/acs.inorgchem.3c00158

Abstract

Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) perovskite has been recognized as a promising oxygen evolution reaction (OER) catalyst due to its superior intrinsic catalytic activity. However, BSCF suffers from serious degradation during the OER process due to its surface amorphization caused by the segregation of A-site ions (Ba²⁺ and Sr²⁺). Herein, we construct a novel BSCF composite catalyst (BSCF-GDC-NR) by anchoring the gadolinium-doped ceria oxide (GDC) nanoparticles on the surface of a BSCF nanorod by a concentration-difference electrospinning method. Our BSCF-GDC-NR has greatly improved bifunctional oxygen catalytic activity and stability toward both oxygen reduction reaction (ORR) and OER compared with the pristine BSCF. The improvement of the stability can be related to that anchoring GDC on BSCF effectively suppresses the segregation and dissolution of A-site elements in BSCF during the preparation and catalytic processes. The suppression effects are ascribed to the introduction of compressive stress between BSCF and GDC, which greatly inhibits the diffusions of Ba and Sr ions. This work can give a guidance for developing the perovskite oxygen catalysts with high activity and stability.