Au@Pt Core-Shell Mesoporous Nanoballs and Nanoparticles as Efficient Electrocatalysts toward Formic Acid and Glucose Oxidation

作者：Holade Yaovi; Lehoux Anais; Remita Hynd; Kokoh Kouakou B; Nap**** Teko W

来源：Journal of Physical Chemistry C, 2015, 119(49): 27529-27539.

DOI：10.1021/acs.jpcc.5b09417

By effectively bypassing the common problem of the loss of contact of platinum nanoparticles to carbon black support involved in the traditional methodology, supportless Pt, Au@Pt 3D-porous nanostructures (PtNBs and Au@PtNBs), and Au-core-Pt-shell nanoparticles (Au(50)Pt(50)NPs) were synthesized. The radiolytic synthesis provides a high control on the size, morphology, and composition of the nanoparticles. Nanoballs, 85 +/- 5 nm for PtNBs and 75 +/- 5 nm for Au@PtNBs, are formed by 3D-interconnected nanowires leading to a giant mesoporous structure. A single Au@PtNB is formed by an ca. 30 nm Au-core, surrounded by a porous Pt-shell of 15 nm thickness made by 3D-connected nanowires of 2 nm diameter. The high catalytic activity of these nanostructures toward organic electrooxidation was highlighted in aqueous media and attributed to their particular core-shell structure. The Au@PtNBs mesoporous materials exhibit improved kinetics toward glucose electrooxidation compared to their counterpart PtNBs and are a promising anode material for direct glucose fuel cells. For formic acid electromidation, Au(50)Pt(50)NPs (3 nm diameter) exhibit the most specific activity. The radiolysis enables the effective synthesis of various core-shell nanostructures ranging from simple to mesoporous ones. The present work continues the research line where advanced methods are used to prepare highly active nanostructures with improved catalytic kinetics.

• 出版日期2015-12-10