| Abstract
| - Adlayers of cobalt(II) and copper(II) phthalocyanines (CoPc and CuPc) prepared on Au(111) from CoPc-and CuPc-saturated benzene solutions were investigated in 0.1 M HClO4 by using cyclic voltammetry and insitu scanning tunneling microscopy (STM). The CoPc-modified Au(111) electrode was found to enhance theelectrochemical reduction of O2 to H2O2, whereas the CuPc-modified Au(111) electrode showed noelectrocatalytic activity for O2 reduction. High-resolution STM images revealed the characteristic shape, internalstructure, and orientation of each CoPc and CuPc molecule in ordered domains. Both CoPc and CuPc moleculesformed three packing arrangements on Au(111) surface, i.e., one rectangular arrangement on reconstructedAu(111) and two hexagonal arrangements on Au(111)−(1 × 1), depending on the surface coverage. Thecenter cobalt ion in CoPc appeared as the brightest spot in the STM image, whereas the copper ion in CuPcappeared as a dark spot.
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