Foamlike Nanostructures Created from Dendritic Platinum Sheets on Liposomes
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- 作者：Yujiang Song ; William A. Steen ; Donovan Peñ ; a ; Ying-Bing Jiang ; Craig J. Medforth ; Qisheng Huo ; Jennifer L. Pincus ; Yan Qiu ; Darryl Y. Sasaki ; James E. Miller ; and John A. Shelnutt
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：May 2, 2006
- 年：2006
- 卷：18
- 期：9
- 页码：2335 - 2346
- 全文大小：1293K
- 年卷期：v.18,no.9(May 2, 2006)
- ISSN：1520-5002
文摘
The synthesis of novel dendritic platinum sheets of 2-nm thickness by the reduction of an aqueousmetal complex with ascorbic acid in the presence of liposomes is reported. Variation of the reactionconditions, including incorporation of a tin porphyrin photocatalyst within the liposomal bilayer to initiateseed-particle growth, allows access to a diverse range of platinum nanostructures, including dendriticnanosheets of uniform diameters and convoluted foamlike structures composed of interwoven dendriticnanosheets. The mechanism of formation of these nanomaterials is investigated with regard to thephotocatalytic generation of platinum nanoparticle seeds, the autocatalytic dendritic growth, and thetemplating on liposomes. The discrete nanospheres of foamlike platinum are of particular interest, asthey may have advantages over conventional platinum black in some applications. For example, theywill likely exhibit improved electrical connectivity and mass-transport properties in electrocatalyticapplications. Electrochemical CO-stripping measurements and N2 adsorption experiments show that thenanospheres of foamlike platinum possess high surface areas. In addition, these platinum foam nanospheresare as active as commercial platinum black in catalyzing the four-electron oxygen reduction reaction.