Evolution of Dendritic Platinum Nanosheets into Ripening-Resistant Holey Sheets
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- 作者：Yujiang Song ; Michael A. Hickner ; Sivakumar R. Challa ; Rachel M. Dorin ; Robert M. Garcia ; Haorong Wang ; Ying-Bing Jiang ; Peng Li ; Yan Qiu ; Frank van Swol ; Craig J. Medforth ; James E. Miller ; Tochi Nwo
- 刊名：Nano Letters
- 出版年：2009
- 出版时间：April 8, 2009
- 年：2009
- 卷：9
- 期：4
- 页码：1534-1539
- 全文大小：295K
- 年卷期：v.9,no.4(April 8, 2009)
- ISSN：1530-6992
文摘
Under electron-beam irradiation, dendritic platinum nanosheets structurally evolve into metastable “holey” nanosheets. Monte Carlo simulations of this structural transformation agree well with electron microscope images detailing the ripening process. The experiments and simulations show that nanoscale holes of a critical size are persistent and give holey sheets their morphological stability and sustained high surface area. Platinum nanostructures composed of these holey nanosheets exhibit improved durability in electrocatalytic reactions due to their remarkable ripening resistance.