Abstract
To improve the electrochemical performance of commercial V2O5, its structures are rearranged and simultaneously doped by coessential and low-valence V(IV) ions via the oxalic acid reductant coupled facile hydrothermal process to achieve successfully V2O5 nanosheets. The materials were characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. After the structural rearrangement and V(IV)-doping, V2O5 nanosheets exhibit bigger lattice parameters and smaller grain size, but more stable structure. Compared to the commercial V2O5, V2O5 nanosheets reveal the higher specific capacity of 230.7 mAh g−1 at the current density of 0.2 A g−1 and the higher rate capacity of 216.3 mAh g−1 at the current density of 5 A g−1, maintain the more excellent capacity retention of 87.8% (189.8 mAh g−1) after 1000 cycles. These results indicate the structural rearrangement and V(IV) doping can greatly improve the structure and performance for commercial V2O5.
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