Facile synthesis of Nb2O5 nanorod array films and their electrochemical properties

► Uniform Nb2O5 nanorod array films were synthesized by a facile hydrothermal process using the non-corrosive NH4F as the reactant. ► These Nb2O5 nanorods grew along 〈0 0 1〉 direction and have good thermal stability both in morphology and in crystal structure. ► The Nb2O5 nanorod film showed a specific charge capacity of up to 380 mAh g−1 even after 50 charge/discharge process, indicating the potential energy storage application of this kind of nanostructure.