Electrochemical Behavior of Nanostructured ɛ-VOPO₄over Two Redox Plateaus

Nanostructured ɛ-VOPO 4 particles, synthesized by the thermal decomposition of H 2 VOPO 4 have a diameter of 150 nm and a length up to 100 nm. Nanostructuring the material allows access to both the 4 V and 2.5 V redox potentials with an overall capacity approaching 200 mAh/g over 50 cycles. The structure of the ɛ-VOPO 4 and its changes were investigated by X-ray diffraction and electron microscopy, and its electrochemical behavior through constant current cycling and cyclic voltammetry.