粒径对树枝状大分子包裹的铂纳米颗粒催化电催化氧还原反应动力学的影响。

Effect of particle size on the kinetics of the electrocatalytic oxygen reduction reaction catalyzed by Pt dendrimer-encapsulated nanoparticles.

作者信息

Ye Heechang, Crooks John A, Crooks Richard M

机构信息

Department of Chemistry and Biochemistry, Texas Materials Institute, Center for Nano and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165, USA.

出版信息

Langmuir. 2007 Nov 6;23(23):11901-6. doi: 10.1021/la702297m. Epub 2007 Oct 4.

DOI:10.1021/la702297m

PMID:17915901

Abstract

Platinum dendrimer-encapsulated nanoparticles (DENs) containing an average of 55, 100, 147, 200, and 240 atoms were prepared within sixth-generation, hydroxyl-terminated, poly(amidoamine) dendrimers. These DENs were immobilized on glassy carbon electrodes, and the effect of particle size on the kinetics of the oxygen reduction reaction (ORR) was quantitatively evaluated using rotating disk voltammetry. The total areas of the Pt DENs were determined by electrochemical CO stripping and hydrogen desorption, and the results were found to be in reasonable agreement with calculated values. The largest particles exhibited the highest specific activities for the ORR.

摘要

在第六代、羟基封端的聚（酰胺胺）树枝状大分子中制备了平均含有55、100、147、200和240个原子的铂树枝状大分子包裹的纳米颗粒（DENs）。这些DENs被固定在玻碳电极上，并使用旋转圆盘伏安法对粒径对氧还原反应（ORR）动力学的影响进行了定量评估。通过电化学CO脱附和氢解吸测定了Pt DENs的总面积，结果与计算值合理吻合。最大的颗粒对ORR表现出最高的比活性。