Synthesis of Fe3O4@SnO2 core–shell nanorod film and its application as a thin-film supercapacitor electrode

Considerable areal capacitance (mF cm−2 level) and long cycling stability (2000 cycles, the best ever for Fe3O4-based electrodes) are demonstrated for the first time for Fe3O4@SnO2 core–shell nanorod film, which is grown directly on a current collector substrate.