Center for Nanoparticle Research, Institute for Basic Science, and School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea.
Phys Chem Chem Phys. 2013 Aug 28;15(32):13658-63. doi: 10.1039/c3cp51520f.
Heat treatment of nanoparticles could induce the surface rearrangement for more stable facet exposure induced by thermodynamics. By changing the heat treatment environment, we confirmed the correlation between the oxygen reduction activity and the effect of surface oxide and the degree of surface rearrangement of Pt nanoparticles. Native surface oxide was not a critical factor for oxygen reduction activity. However, the degree of surface rearrangement could affect the activity, which was confirmed by the surface sensitive techniques such as CO(ad) oxidation and potential of zero total charge. Analysis indicated that the driving force for nanoparticle surface rearrangement was affected by the heat treatment environment such as gas, in our case.
纳米粒子的热处理可以通过热力学诱导表面重排来实现更稳定的晶面暴露。通过改变热处理环境，我们证实了氧还原活性与表面氧化物的作用以及 Pt 纳米粒子表面重排程度之间的相关性。本征表面氧化物不是氧还原活性的关键因素。然而，表面重排程度可以影响活性，这可以通过 CO(ad)氧化和零总电荷电位等表面敏感技术来证实。分析表明，纳米粒子表面重排的驱动力受到热处理环境（例如气体）的影响，在我们的情况下就是如此。
