A simple approach to tailor OER activity of SrxCo0.8Fe0.2O3 perovskite catalysts. (20th March 2019)

• Record Type: Journal Article
• Authors: Da, Yumin; Zeng, Lirong; Wang, Caiyun; Gong, Cairong; Cui, Lan
• Is Part Of: Electrochimica acta. Volume 300(2019)
• Page Start: 85
• Page End: 92
• Publication Date: 2019-03-20
• Subjects: Perovskite -- Deficiency -- Oxygen evolution reaction -- SrxCo0.8Fe0.2O3−δ; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.01.052
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Developing an efficient catalyst for oxygen evolution reaction (OER) is one of the most effective ways to cope with the energy crisis. Here, we report a simple method to prepare A-site deficiency Srx Co0.8 Fe0.2 O3−δ (x = 0.9, 0.95, 1) perovskites by sol-gel. XRD、SEM and XPS are used to characterize structure and element valence of catalysts. The introduction of A-site deficiency results in the expansion of lattice expansion due to the increase of oxygen vacancies and optimization of eg occupancy of B-site transition metal, which greatly improves the OER activity of catalysts. Among them, Sr0.95 Co0.8 Fe0.2 O3−δ (S0.95 CF) exists the best activity. Besides, after the durability test, an unusual activation process with enhanced OER activity was observed for all the prepared perovskites. This work highlights the importance of tailoring A-site deficiency of perovskites as a valid strategy to improve OER activity.