Electrostatic Self‐Assembly of the Composite La_0.7Sr_0.3MnO₃@Ce_0.75Zr_0.25O₂ as Electrocatalyst for the Oxygen Reduction Reaction in Aluminum–Air Batteries

Abstract

La1−xSrxMnO3 (LSM) has been proposed as one of the best oxygen reduction reaction catalysts (ORRCs) to substitute noble metals. It is well known that an improvement of the oxygen‐adsorption capacity is beneficial to the catalytic activity of LSM perovskites. Herein, the composite material La0.7Sr0.3MnO3@Ce0.75Zr0.25O2 (LSM@CZ) has been synthesized by a facile electrostatic self‐assembly method in a two‐step strategy. The CZ nanoparticles are well distributed on the surface of the LSM material. The LSM‐4CZ composite catalyst exhibits a good catalytic activity in alkaline solution. The onset potential, half‐wave potential, and electron transfer number of the LSM‐4CZ composite catalyst are 0.898 V, 0.695 V, and 4, respectively. The LSM‐4CZ composite catalyst has a good durability with current retention of 93.9 % after 80 000 s and it exhibits a much better stability than Pt/C, the retention of which is 83.5 %. If we used LSM‐CZ as the ORRC, the maximum power density of the Al–air battery reached 242.9 mW cm−2, which is approximately 40 % higher than that of the battery with LSM (177.3 mW cm−2). This indicates that the LSM@CZ composite material is a promising cathodic electrocatalyst for metal–air batteries.

Aqueous metal-air batteries: Fundamentals and applications

“…Metal oxides and the hybrids Metal oxides are considered as good as non-noble metal catalysts due to their low-cost and considerable high activity in alkaline electrolytes [143,[202][203][204][205], which mainly focus on Mn-based oxides [50,190,206,207], such as MnO2 [193,206,208,209], Mn-based perovskite [137,[210][211][212][213][214][215][216] and spinel . For example, LaMnO3, one of typical perovskites (ABO3), possesses good intrinsic activity for ORR.…”

Toward Promising Cathode Catalysts for Nonlithium Metal–Oxygen Batteries

“…For ORR catalysis, it is generally accepted that the B site is the active center that determines the actual ORR activity (Figure h) . Liu et al explored a series of perovskite‐type ORR catalysts for Al–O 2 batteries, and the composite catalysts, consisting Ce 0.75 Zr 0.25 O 2 and La 0.7 Sr 0.3 MnO 3 , were developed as an efficient ORR catalyst for Al–O 2 batteries, giving a high power density of 233.4 mW cm −2 (Figure i,j).…”