Abstract
Carbon coated highly crystalline tantalum oxide (TaO@C) nanoparticles with self-doping Ta4+ and lattice oxygen were successfully prepared by via a topotactic conversion strategy by annealing polydopamine-coated (NH4)2Ta2O3F6 mesocrystals. TaO@C sample exhibits not only satisfactory photocatalytic performance on methylene blue (MB) degradation with a efficiency of 57.66% and 31.81% under ultraviolet and visible light illumination for 3 h, but also superior lithium storage properties with high reversible capacity, high rate capability (140 mAh g−1 at 1250 mA g−1) and outstanding cyclic stability (∼109 mAh g−1 at 1250 mA g−1 current density after 900 cycles with 0.01% capacity varying per cycle capacity retention)). It is primarily attributed to the synergistic effect among large surface area (42.61 m2·g−1), fine particle size (<60 nm), core-shell structure with tight carbon coating and porous structure, and defects, leading to excellent electronic conductivity and lower bandgap energy. Furthermore, surface pseudocapacitive makes great contribution on good rate capability.
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