Wang Chao, Daimon Hideo, Sun Shouheng
Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
Nano Lett. 2009 Apr;9(4):1493-6. doi: 10.1021/nl8034724.
Monodisperse dumbbell-like Pt-Fe(3)O(4) nanoparticles are synthesized by epitaxial growth of Fe onto Pt nanoparticles followed by Fe oxidation. The nanoparticle size in the structure is tunable from 2 to 8 nm for Pt and 6 to 20 nm for Fe(3)O(4). Pt nanoparticles in the Pt-Fe(3)O(4) structure show a 20-fold increase in mass activity toward oxygen reduction reaction compared with the single component Pt nanoparticles and the commercial 3 nm Pt particles. The work proves that it is possible to maximize catalytic activity of the Pt nanoparticle catalyst through the control not only of Pt size and shape but also of its interaction with Fe(3)O(4) nanoparticles.
通过在铂纳米颗粒上外延生长铁然后进行铁氧化，合成了单分散哑铃状的铂 - 四氧化三铁纳米颗粒。该结构中纳米颗粒的尺寸对于铂可在2至8纳米范围内调节，对于四氧化三铁则在6至20纳米范围内调节。与单组分铂纳米颗粒和商用3纳米铂颗粒相比，铂 - 四氧化三铁结构中的铂纳米颗粒对氧还原反应的质量活性提高了20倍。这项工作证明，不仅可以通过控制铂的尺寸和形状，还可以通过控制其与四氧化三铁纳米颗粒的相互作用来最大化铂纳米颗粒催化剂的催化活性。
