Electrocatalysis on Platinum Nanoparticles: Particle Size Effect on Oxygen Reduction Reaction Activity
Electrocatalysis on Platinum Nanoparticles: Particle Size Effect on Oxygen Reduction Reaction Activity
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DOI：
10.1021/nl2017459
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发表时间：
2011-09-01
期刊：
影响因子：
10.8
通讯作者：
Shoemaker, Krista
中科院分区：
文献类型：
--
作者：
Shao, Minhua;Peles, Amra;Shoemaker, Krista
我们测定了HClO4溶液中氧还原对Pt颗粒在1 ~ 5nm范围内的比活性和质量活性。基于密度泛函理论计算，完全松弛的纳米颗粒在2.2 nm处的最大质量活性得到了很好的解释。边缘位点的存在是纳米颗粒比活性低的主要原因，因为这些位点的氧结合能很强。我们的结果清楚地表明，催化活性高度依赖于纳米颗粒的形状和大小。
We determined the size-dependent specific and mass activities of the oxygen reduction in HClO4 solutions on the Pt particles in the range of 1-5 nm. The maximal mass activity at 2.2 nm is well explained based on density functional theory calculations performed on fully relaxed nanoparticles. The presence of the edge sites is the main reason for the low specific activity in nanoparticles due to very strong oxygen binding energies at these sites. Our results clearly demonstrate that the catalytic activity highly depends on the shape and size of the nanoparticles.