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Electrochemically switchable selective membranes play an important role inselective filtration processes such as water desalination, industrial wastetreatment and hemodialysis. Currently, membranes for these purposes need to beoptimized in terms of electrical conductivity and stability against fouling andcorrosion. In this paper, we report the fabrication of boron-doped diamondmembrane by template diamond growth on quartz fiber filters. The morphology andquality of the diamond coating are characterized via SEM and Ramanspectroscopy. The membrane is heavily boron doped (> 1021 cm-3) with > 3 Vpotential window in aqueous electrolyte. By applying a membrane potentialagainst the electrolyte, redox active species can be removed via flow-throughelectrolysis. Compared to planar diamond electrodes, the ~250 times surfaceenlargement provided by such a membrane ensures an effective removal of targetchemicals from the input electrolyte. The high stability of diamond enables themembrane to not only work at high membrane bias but also to be self-cleaningvia in situ electrochemical oxidation. Therefore, we believe that the diamondmembrane presented in this paper will provide a solution to future selectivefiltration applications especially in extreme conditions.

Electrically Conductive Diamond Membrane for Electrochemical Separation Processes