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Scanning electrochemical microscopy of a fuel-cell electrocatalyst deposited onto highly oriented pyrolytic graphite

Kucernak, AR; Chowdhury, PB; Wilde, CP; Kelsall, GH; Zhu, YY; Williams, DE; (2000) Scanning electrochemical microscopy of a fuel-cell electrocatalyst deposited onto highly oriented pyrolytic graphite. Electrochimica Acta , 45 (27) 4483 - 4491.

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Abstract

The hydrogen evolution reaction (HER) has been examined on a platinum electrocatalysts (Johnson Matthey HSA platinum black) dispersed onto a flat highly oriented pyrolytic graphite (HOPG) electrode using an atomic force microscope (AFM) modified to perform scanning tunneling microscopy (STM) and scanning electrochemical microscopy (SECM). For both STM and SECM experiments the same Pt/Ir tips produced by electrochemical etching of Pt/Ir wire followed by coating with varnish have been used. The coating process leaves only the very end of the tip exposed. Positioning the SECM tip 42 nm from one of the particles allows monitoring of hydrogen evolution from that particle as a function of substrate potential. In a separate experiment the substrate has been polarized at a potential at which hydrogen evolution occurs and the SECM tip rastered over the surface to obtain images of the local concentration of hydrogen. This map indicates the activity of hydrogen production as a function of position. (C) 2000 Elsevier Science Ltd. All rights reserved

Type:Article
Title:Scanning electrochemical microscopy of a fuel-cell electrocatalyst deposited onto highly oriented pyrolytic graphite
Additional information:Journal Article 358BX Kucernak AR Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England ELECTROCHIM ACTA
Keywords:Ar, As, BOUNDARY-ELEMENT METHOD, CHEMICAL-EQUILIBRIUM, Diffusion, electrocatalysis, ELECTRODE, ELECTRODE SURFACES, evolution, Force, function, GRAPHITE, HOPG, Hydrogen, hydrogen evolution reaction, Images, local, MED, MICROELECTRODES, Microscopy, migration, monitoring, NA2SO4 SOLUTION PH=7, nanoparticles, particle, Particles, POSITION, process, processes, REDUCTION, SCANNING ELECTROCHEMICAL MICROSCOPY, scanning electrochemical microscopy (SECM), Science, SECM, STEADY-STATE VOLTAMMETRY, SUBSTRATE, SURFACE
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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