Constant-distance mode SECM as a tool to visualize local electrocatalytic activity of oxygen reduction catalysts

Beilstein Journal of Nanotechnology

卷:5

Thomas Erichsen¹  Michaela Nebel²  Wolfgang Schuhmann³ 

[1] Ruhr-Universität Bochum, D-44780 Bochum;

[2] Lehrstuhl für Analytische Chemie;

[3] Sensolytics GmbH, Universitätsstr 142, D-44799 Bochum;

关键词: electrocatalysis;    oxygen reduction;    recessed microelectrodes;    redox-competition SECM;    SECM;    scanning electrochemical microscopy;    shearforce-based constant-distance mode;   

DOI  :  10.3762/bjnano.5.14

来源: DOAJ

【 摘 要 】

Multidimensional shearforce-based constant-distance mode scanning electrochemical microscopy (4D SF/CD-SECM) was utilized for the investigation of the activity distribution of oxygen reduction catalysts. Carbon-supported Pt model catalyst powders have been immobilized in recessed microelectrodes and compared to a spot preparation technique. Microcavities serve as platform for the binder-free catalyst sample preparation exhibiting beneficial properties for constant-distance mode SECM imaging concerning modified surface area and catalyst loading. The integration of the redox competition mode of SECM into the detection scheme of the 4D SF/CD mode is demonstrated for specifically adapting high-resolution SECM experiments to powder-based catalyst preparations.

【 授权许可】

Unknown