Formation of Aligned Nanoporous/Nanotubular Layers of Vanadium Oxy-Nitrides

This talk will present self-organized vanadium oxy-fluoride nanotubular layers grown by electrochemical anodization of vanadium in a [BF4]^- electrolyte. In a thermal conversion of this amorphous VO_xF_y precursor structure in ammonia gas, aligned vanadium oxy-nitride (VO_xN_y) nanoporous/nanotubular layers could be formed. We established conditions to reach conversion of precursor structures to a well crystallized VO_xN_y nanotube structure, without the formation of any secondary phases or the collapse of the ordered morphology. The formed VON structures were investigated by SEM, EDX, XRD, XPS and electrochemical measurements for capacitor applications. The overall capacitance of the vanadium oxy-nitride structures showed a value of 250 F/g.

Reference:

Y. Yang, R. Kirchgeorg, R. Hahn, P. Schmuki Electrochemistry Communications, accepted