Formation of the core–shell structure in the Pd–Ag system by electroleaching of the alloy. Electrocatalytic properties
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- 作者：B. I. Podlovchenko ; Yu. M. Maksimov ; A. G. Utkin
- 关键词：electrodeposition ; PdAg alloy ; electroleaching ; core–shell structure ; electrochemically active surface area ; HCOOH electrooxidation
- 刊名：Russian Journal of Electrochemistry
- 出版年：2015
- 出版时间：October 2015
- 年：2015
- 卷：51
- 期：10
- 页码：891-898
- 全文大小：1,208 KB
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Yu. M. Maksimov (1)
A. G. Utkin (1)
1. Faculty of Chemistry, Moscow State University, Vorob’evy Gory 1, bld. 3, Moscow, 119234, Russia - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Electrochemistry
Physical Chemistry
Russian Library of Science - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1608-3342
文摘
An electrodeposit (e.d.) Pd0.5Ag0.5 is prepared in a mixed aqueous solution of PdSO4 + Ag2SO4 (0.5 M H2SO4 as the supporting electrolyte) under conditions of diffusion-controlled deposition of Pd2+ and Ag+. Using the SEM, MPA, XPS, CVA, and ICP-AES methods, it is shown that cycling of the PdAgin/GC electrode potential E in the range of 0.09-.4 V (RHE) results in preferential dissolution of the Ag component. For a large number of cycles, the core(PdAg)–shell(Pd) structure is formed. The shell is sufficiently highly permeable for silver atoms escaping from the core to the surface. The possibility of assessing the electrochemically active surface area of the PdAg alloy by the adsorption of copper is analyzed. It is found that as regards the specific activity in the HCOOH electrooxidation, e.d. PdAg differs only slightly from e.d. Pd. Keywords electrodeposition PdAg alloy electroleaching core–shell structure electrochemically active surface area HCOOH electrooxidation