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Boron doped diamond (BDD) is presently the subject of considerable interest as an electrode material. This is a consequence of its very wide potential window in aqueous solution (ca. -1.35 to +2.3 V versus the normal hydrogen electrode), low background currents, and corrosion stability in aggressive media. In collaboration with the Diamond Physics group at Warwick, we investigate the electrical and electrochemical properties of single crystal and polycrystalline BDD. These properties have been studied using cathode luminescence (CL), scanning electron microscopy (SEM), conducting atomic force microscopy (C-AFM), scanning electrochemical microscopy (SECM) and various other electrochemical techniques. Research is also focused on the application of BDD electrodes in electroanalysis.