Due to the distinct electrical properties, ternary perovskites, such as barium titanate (BaTiO3), have attracted much attention during the past decades. Perovskite oxide materials can be synthesized with various techniques, whereas most of the approaches suffer from large crystal grains with wide ranges in shape and size, or expensive and energy-inefficient. How to synthesize perovskite materials with low-cost, low temperature and within nanometer scale thus become the focus of much research effort. Herein, by using star-like poly(acrylic acid)-block-polystyrene (PAA-b-PS) diblock copolymers as nanoreactor, we propose a strategy for synthesizing perovskite nanoparticles (NPs), BaTiO3 and PbTiO3. The strong coordination between the bimetallic precursors and the functional groups of PAA (carboxylic acid group) enables the confinement of NPs within PAA block, offering an approach to precisely modulate the size of NPs by simply tuning the molecular weight of PAA block. By annealing the hybrid composite comprising BaTiO3 NPs and graphene, the size of the synthesized BaTiO3 NPs can be maintained, and the crystallinity can be improved. A significantly enhanced oxygen reduction reaction performance is observed after doping with both 5 mol% of cobalt and lanthanum with BaTiO3 NPs, respectively. This work demonstrates a new type of highly efficient perovskite oxide catalyst for electrochemical energy technologies.

Robust synthesis of monodisperse perovskite oxide nanocrystals with tunable dimensions and composition for enhanced oxygen reduction reaction

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.