Attenuating a metal–oxygen bond of a double perovskite oxide via anion doping to enhance its catalytic activity for the oxygen reduction reaction. Issue 28 (8th July 2020)

• Record Type: Journal Article
• Authors: Zhang, Lihong; Sun, Wang; Xu, Chunming; Ren, Rongzheng; Yang, Xiaoxia; Qiao, Jinshuo; Wang, Zhenhua; Sun, Kening
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 28(2020)
• Page Start: 14091
• Page End: 14098
• Publication Date: 2020-07-08
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta04820h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : F-doping promotes the diffusion and surface adsorption process of oxygen at the cathode, and the reaction kinetics have been significantly improved. Abstract : Elevating the sluggish oxygen reduction reaction (ORR) activity of the cathode material is crucial to the development and widespread application of intermediate-temperature solid oxide fuel cells (IT-SOFCs). Herein, a novel SOFC cathode, with superior ORR activity, is designed by incorporating F anions at O-sites of a double perovskite oxide (Sr2 Fe1.5 Mo0.5 O6− δ, SFM). The resulting F-doped SFM cathode (Sr2 Fe1.5 Mo0.5 O6− x − δ F x, SFMF, x = 0, 0.1, 0.2 and 0.3) exhibits improved crystal structure symmetry and enhanced electrocatalytic activity for the ORR. At 800 °C, the polarization resistance of F-doped SFM is significantly decreased to 0.072 Ω cm 2, which can be ascribed to the enhanced oxygen reduction capacity. Moreover, F-doping reduces the metal–oxygen bond energy and accelerates the transportation of O-ions during the electrochemical process, resulting in significantly enhanced ORR activity.