Formation of the core-shell structure in the Pd-Ag system by electroleaching of the alloy. Electrocatalytic properties

被引：11
|
作者：
Podlovchenko, B. I. [1 ]
Maksimov, Yu. M. [1 ]
Utkin, A. G. [1 ]
机构：
[1] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119234, Russia
来源：
RUSSIAN JOURNAL OF ELECTROCHEMISTRY | 2015年 / 51卷 / 10期
基金：
俄罗斯基础研究基金会;
关键词：
electrodeposition; PdAg alloy; electroleaching; core-shell structure; electrochemically active surface area; HCOOH electrooxidation; FORMIC-ACID; GALVANIC DISPLACEMENT; METHANOL OXIDATION; OXYGEN REDUCTION; PT(CU) CATALYSTS; PALLADIUM; HYDROGEN; NANOPARTICLES; ELECTROOXIDATION; ELECTRODEPOSITS;
D O I：
10.1134/S1023193515100110
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
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 0.09-1.4 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.
引用
收藏
页码：891 / 898
页数：8
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