Synthesis, structural and morphological characterizations of nano-Ru-based perovskites/RGO composites

Résumé

Abstract Highly-dispersed Ru-based perovskites supported on reduced graphene oxide (A-RG) nanocomposites are prepared using differentA-metal salts (Sr(NO3)2, Ba(NO3)2and Ca(NO3)2). The procedure is based on a redox reaction between the metal precursors and graphene oxide (GO) using two different routes of reaction initiation: through thermal heating or by microwave-assisted heating. The resulting nanocomposites do not require further calcination, making this method less energy-demanding. In addition, no additional chemical reagents are required for either the GO reduction or the metal precursor oxidation, leading to an overall simple and direct synthesis method. The structure and morphology of the as-preparedA-RG (non-calcined) nanocomposites are characterized using various structural analyses including XRD, XPS, SEM/EDX and HR-TEM. Changing metalAin the perovskite as well as the “activation method” resulted in significant structural and morphological changes of the formed composites. SrRuO3and BaRuO3in combination with RuO2are obtained using a conventional combustion method, while SrRuO3(~1 nm size) in combination with Ru nanoparticles are successfully prepared using microwave irradiation. For the first time, a microwave-assisted synthesis method (without calcination) was used to form crystalline nano-CaRuO3.

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