Covalent Attachment of Catalyst Molecules to Conductive Diamond: CO_2 Reduction Using 'Smart' Electrodes

摘要

We report here covalent attachment of a catalytically active cobalt complex onto boron-doped, p-type conductive diamond. Peripheral acetylene groups were appended on a cobalt porphyrin complex, and azide-alkyne cycloaddition was used for covalent linking to a diamond surface decorated with alkyl azides. The functionalized surface was characterized by X-ray photo-electron spectroscopy and Fourier transform IR spectros-copy, and the catalytic activity was characterized using cyclic voltammetry and FTIR. The catalyst-modified diamond surfaces were used as "smart" electrodes exhibiting good stability and electrocatalytic activity for electrochemical reduction of CO_2 to CO in acetonitrile solution.