Highly branched Pt-Cu nanodandelion with high activity for oxygen reduction reaction
| 发表年度： |
2019 |
| 期： |
1 |
| 卷： |
44 |
| 页： |
174-179 |
| 摘要： |
A facile hydrothermal route has been developed to synthesize the highly branched Pt58Cu42 nanoparticles via mixing the H2PtCl6 and CuCl2 with octadecylamine. The Pt58Cu42 after post treatment forms a dandelion flower 3-D structure. A combination of both the branched shape and Pt-Cu composition effects in the Pt58Cu42-nanoparticles shows superior electrocatalytic activity and durability to commercial Pt black for oxygen reduction reaction. The mechanism for the de-alloying and reconstructing of the Pt58Cu42-nanoparticles in electrochemical activity and durability tests has been proposed. It is found that after the durability process, the Pt58Cu42 precursor alloy changes into a substantially Pt enriched Pt-Cu alloy (Pt79Cu21) with a Pt skin. The Pt skin effectively prevents the further dissolution of the Cu below the near-surface to enhance its durability. What's more, the Pt skin exposed to (111) planes which have the lowest surface energy among the low-index planes further promotes the improvement of durability of the Pt-Cu catalyst. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. |
| 刊物名称： |
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY |
| 影响因子： |
4.084 |
