▎ 摘　　要

A strategy to reduce critical raw metals in nanocatalysts is to synthesizenanocomposites based on defective or bimetallic nanoparticles deposition on carbon nanomaterials. Conventional solution-based methods suffer from the extensive use of solvents and difficult scalability. In this study, defective Pt-Ni nanoparticles are formed on graphene nanoplatelets thanks to an original approach based on simultaneous or sequential low-temperature oxygen plasma treatments of nickel and platinum acetylacetonates. The two processing conditions produce aggregated Pt-Ni nanoparticles with variable morphologies, size crystallinities, and oxidation states. The materials analytical characterizations show that the sequential treatment promotes small Pt-Ni particle aggregates nucleation, while the simultaneous treatment leads to complex interconnected Pt-Ni-based phases. Such defective nanoparticles are promising for multiple applications in catalysis and energy. [GRAPHICS]