Synthesis and characterization of alumina-embedded SrCo0.95V0.05O3 nanostructured perovskite: An attractive material for supercapacitor devices

• Published in: Microporous and mesoporous materials Vol. 293; p. 109797
• Main Authors: Salguero Salas, Marcelo A., De Paoli, Juan M., Linarez Pérez, Omar E., Bajales, Noelia, Fuertes, Valeria C.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-02-2020
• Subjects: Anodic aluminum oxide (AAO); Cobalt-based perovskite; Electron microscopy; Sol-gel template synthesis; Supercapacitor; X-ray diffraction; Sol-gel template synthesis; X-ray diffraction; Supercapacitor; Cobalt-based perovskite; Anodic aluminum oxide (AAO); Electron microscopy
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2019.109797

Cobalt-based perovskite exhibit fascinating physical properties at the nanoscale. Better oxygen transport, higher ionic/electronic mixed conductivity and enhanced electrocatalytic activity are some of the most important highlighted properties compared to bulk perovskites. Such materials have proved to be excellent candidates for applications in solid oxide fuel cells and supercapacitors.
In this work, a technological approach using highly ordered porous anodic aluminum oxide (AAO) as a template for the synthesis of low dimensional SrCo0.95V0.05O3 cubic perovskite is introduced. Thus, the impregnation of AAO membranes in two different mixed oxide precursor solutions, citric acid, on the one hand, and tartaric acid on the another hand, followed by thermal treatments and alumina dissolution, led to the successful synthesis of alumina-embedded SrCo0.95V0.05O3 nanostructured perovskite. By means of the Rietveld method refinement of the XRD data, the perovskite crystallization in a Pm-3m cubic system, as well as some crystalline phases of alumina were identified. FT-IR results showed the presence of a band at ~580 cm−1 for the nanostructured perovskites, attributed to the asymmetric stretching of the (Co/V)–O bonds, in good agreement with those exhibited by bulk perovskites. In addition, the capacitive behavior of composite electrodes prepared with low dimensional perovskites and lubricating graphite was monitored by cyclic voltammetry and galvanostatic charge/discharge cycles. Our results show an improved supercapacitive performance of the nanostructured perovskite respect to that obtained for the bulk configuration, indicating that nanostructured SrCo0.95V0.05O3 perovskite arises as a promising candidate material for supercapacitor devices.
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•Mesoporous alumina as template for low dimensional SrCo0.95V0.05O3 cubic perovskite.•Nanoperovkites obtained from mixed oxide precursors, thermal treatments and alumina dissolution.•Pm-3m cubic system crystallization of alumina-embedded perovskite with 5 mol% V5+.•Presence of infrared band at ~580 cm−1 due to asymmetric stretching of (Co/V)–O bonds.•Enhanced capacitive behavior of composite containing nanoperovskites compared to bulk material.