Nanostructured Platinum (HI-ePt) Films: Effects of Electrodeposition Conditions on Film Properties
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- 作者：Joanne M. Elliott ; George S. Attard ; Philip N. Bartlett ; Nicholas R. B. Coleman ; Daniel A. S. Merckel ; and John R. Owen
- 刊名：Chemistry of Materials
- 出版年：1999
- 出版时间：December 1999
- 年：1999
- 卷：11
- 期：12
- 页码：3602 - 3609
- 全文大小：255K
- 年卷期：v.11,no.12(December 1999)
- ISSN：1520-5002
文摘
A systematic investigation into the effects of deposition conditions on the electrochemicalproperties and nanostructure of high surface area (up to ~460 m2 cm-3) mesoporous platinumfilms (HI-ePt) obtained by electroreduction of hexachloroplatinic acid (HCPA) from anhexagonal lyotropic liquid crystalline phase is reported. The surface area, repeat distance,and regularity of the nanostructure and the surface morphology of the films were shown todepend on the deposition conditions. In particular, the deposition potential was found tohave a notable effect on the film surface area and on the uniformity of nanostructure. Theresults obtained are explained by variations in the efficiency of the deposition process andthe relative contributions of competing reactions. Increasing the temperature of electrodeposition was found to increase significantly the surface areas of the films and to increase therepeat distance of the nanostructure. In addition, a roughening of the films on both a micro-and a nanometer scale was observed with an increase in temperature. We also found thatthe thickness of the electrodeposited films scaled linearly and that the volumetric surfacearea was constant, with the charge passed during the electrodeposition process, indicatinguniform accessibility of the pore system.