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- W2003003178 abstract "The electrochemistry of a novel organic−inorganic material in which 4,4‘-bipyridinium units (BP) are covalently attached to the walls of a periodic mesoporous organisilica (PMO) of the MCM-41 type is described. The pristine material (BP@PMO), having its internal space completely filled by the cetyltrimethylammonium structure-directing agent, is almost electrochemically silent. In contrast, the extracted material obtained after removal of the structure-directing agent (BP@PMO-ex) exhibits two reduction peaks at −0.36 and −0.75 V vs AgCl/Ag in contact with aqueous electrolytes. BP@PMO-ex shows a remarkable electrocatalytic effect on the oxidation of 1,4-dihydrobenzoquinone (H2Q) that is studied by rotating disk voltammetry. At low scan rates the catalytic process is under diffusion/convection control, with a second-order reaction between the surface catalyst and H2Q acting as a rate-determining step. At high rotation rates the catalytic process becomes independent of the mass transfer, in agreement with the idea that electroactive bipyridinium centers are confined to a boundary zone of the MCM-41 grains." @default.
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- W2003003178 date "2003-10-23" @default.
- W2003003178 modified "2023-10-17" @default.
- W2003003178 title "Electrochemistry of Mesoporous Organosilica of MCM-41 Type Containing 4,4‘-Bipyridinium Units: Voltammetric Response and Electrocatalytic Effect on 1,4-Dihydrobenzoquinone Oxidation" @default.
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- W2003003178 doi "https://doi.org/10.1021/jp030852w" @default.
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