Controllable porous perovskite with three-dimensional ordered structure as an efficient oxygen reduction reaction electrocatalyst for flexible aluminum-air battery

• Published in: Journal of power sources 2022-03, Vol.523, p.231028, Article 231028
• Main Authors: Shui, Ziyi, Zhao, Wei, Xiao, Hang, Zhu, Liangliang, Liu, Yilun, Deng, Xiaobin, Chen, Xi
• Format: Article
• Language: English
• Subjects: A/B-site doping; First principles; Large surface area; Oxygen reduction reaction; Three-dimensional ordered structure
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2022.231028

Perovskite materials have recently attracted extensive attention since tailoring their chemical compositions has led to remarkable activity toward oxygen reduction reaction. However, the desired electrocatalytic activity is limited by the morphological effect, and lack of methods to achieve large surface area. Herein we report an effective strategy to synthesize three-dimensional ordered macroporous (3DOM) perovskite oxides, where La0.75Sr0.25MnO3 (3DOM LSMO) displays excellent ORR activity and durability with considerable specific surface area (43.1 m2 g-1). The electrochemical results exhibit that the electron transferred numbers (n) is close to 4 and the H2O2 yield (% H2O2) is as low as 10% for 3DOM LSMO, which mainly attributes to comprehensive effect of the reduced Mn valence state, the increased specific surface, and the exposed high activity crystal planes. First-principles study confirms that the lowest overpotential obtained by LSMO is in good agreement with the experimental results. Our work demonstrates perovskite oxides with larger surface area could be advanced oxygen catalysts with wide applications. [Display omitted] •An effective synthesis strategy is proposed to generate 3DOM perovskites.•3DOM perovskites exhibit a considerable specific surface area.•3DOM perovskites appears a new exposure of (100) crystal plane spacing.•3DOM LSMO displays superior ORR activity, where n = 3.72 and % H2O2 < 10%.•First-principles study confirms that LSMO shows significantly lower overpotential.