Abstract
Decoration of metal nanoparticles (NPs) on the surface of perovskite oxides present an innovative way of improving their activity in a vast range of catalytic reactions. Conventional methods used to deposit NPs present limitations and for instance they often result in agglomeration during their operation in the catalytic process. Although exsolution (release of active metal on the surface upon exposure to reducing atmosphere) of catalytically active metal results in non-agglomerated NPs with greater stability, still the procedure is very long (10~30 hours) and energy demanding. Herein, we demonstrate a new dimension in the exsolution of NPs from perovskite oxides by exposing them under plasma, accelerating the exsolution to occur within a few minutes rather than hours. A non-stoichiometric (A-site deficient) perovskite oxides having a composition of La0.43Ca0.37Ti0.94Ni0.06O2.955(LCTN) was synthesized and further treated in a low-pressure plasma. Different plasma parameters (time, power and gas composition) were varied in order to understand the mechanisms involved in this plasma-enhanced exsolution. The exsolved samples were characterized by SEM, XRD, XPS and TEM. It is expected that plasma driven exsolution will open new dimensions in design and anchorage of exsolved NPs and provides solutions for catalysis and electro-catalysis.
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