Local deposition and characterisation of K2Co[Fe(CN)6] and K2Ni[Fe(CN)6] by scanning electrochemical microscopy

被引：21

作者：

Sauter, S ^{[1
]}

Wittstock, G ^{[1
]}

机构：

[1] Univ Leipzig, Wilhelm Ostwald Inst Phys & Theoret Chem, D-04103 Leipzig, Germany

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2001年 / 5卷 / 03期

关键词：

scanning electrochemical microscope; cobalt hexacyanoferrate; nickel hexacyanoferrate; microstructuring; electrocatalysis;

D O I：

10.1007/s100080000137

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Scanning electrochemical microscopy (SECM) is used to form local deposits of different Prussian blue analogs on macroscopic surfaces of gold and glassy carbon. Dissolution of Co and Ni sacrificial ultramicroelectrodes (UMEs) generates divalent cations in the gap between the UME and the macroscopic specimen electrode. Co2+ or Ni2+ precipitate with [Fe(CN)(6)](4-) formed by reduction of [Fe(CN)(6)](3-) at the macroelectrode. By moving the UME while generating Co2+ Ni2+, lines can be "drawn'' with a width of 130 mum. The line width can be adjusted by reagent concentration and translation speed of the UME. Different pulse programs allow the formation of ring-shaped structures. The deposited hexacyanoferrate microstructures show catalytic activity for the reduction of Fe3+ which was imaged in the feedback and generation-collection modes of the SECM.

引用

页码：205 / 211

页数：7

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