Towards Size-Controlled Deposition of Palladium Nanoparticles from Polyoxometalate Precursors: An Electrochemical Scanning Tunneling Microscopy Study

被引：10

作者：

Bock, Nicolas ^{[1
,2
]}

De Clercq, Astrid ^{[1
,2
]}

Seidl, Lukas ^{[3
]}

Kratky, Tim ^{[1
,2
]}

Ma, Tian ^{[4
]}

Guenther, Sebastian ^{[1
,2
]}

Kortz, Ulrich ^{[4
]}

Heiz, Ueli ^{[1
,2
]}

Esch, Friedrich ^{[1
,2
]}

机构：

[1] Tech Univ Munich, Catalysis Res Ctr, Lichtenbergstr 4, D-85748 Garching, Germany

[2] Tech Univ Munich, Dept Chem, Lichtenbergstr 4, D-85748 Garching, Germany

[3] Swiss Fed Labs Mat Sci & Technol, Dept Mobil Energy & Environm, Uberlandstr 129, CH-8600 Dubendorf, Switzerland

[4] Jacobs Univ, Dept Life Sci & Chem, Campus Ring 1, D-28759 Bremen, Germany

来源：

CHEMELECTROCHEM | 2021年 / 8卷 / 07期

关键词：

electrodeposition; electrochemical scanning tunneling microscopy; cluster; polyoxometalates; palladium;

D O I：

10.1002/celc.202100131

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We present a novel in situ electrochemical approach to deposit small size-controlled palladium(0) clusters from 12-Pd-II-oxo-metalate precursors. These clusters are formed through the reductive surface polarization of a Au(111) support. Electrochemical scanning tunneling microscopy (EC-STM) reveals that the electrochemical reduction occurs at much lower potentials than that for simple Pd salt solutions. The resulting particles are one atomic layer high and show a narrow size distribution. Precursor mass transport limitations and preconditioning of the solid-liquid interface at low potentials influence the obtained morphology. In particular, a concomitant reduction mechanism via formation of molecular hydrogen is discussed. The deposited clusters show the typical behavior of small metallic Pd islands in EC-STM: The apparent cluster height increases reversibly when lowering the potential close to the onset of hydrogen evolution, which is attributed to hydrogen adsorption.

引用

页码：1280 / 1288

页数：9