Construction of 1T-MoSe2@TiC/C Branch-Core Arrays as Advanced Anodes for Enhanced Sodium Ion Storage.

The utilization of active sites and reaction kinetics of MoS 2 anodes for sodium ion batteries (SIBs) are highly related with the phase components (IT and 2H phases) and electrode architecture. In this work, we design and fabricate wrinkled 1T-MoSe 2 nanoflakes anchored on highly conductive TiC/C nanorods forming 1T-MoSe 2 @TiC/C branch-core arrays by a powerful chemical vapor deposition (CVD)-solvothermal method. Furthermore, 1T-MoSe 2 branch can be easily transformed into 2H-MoSe 2 counterpart after a facile annealing process. As compared to 2H-MoSe 2 , 1T-MoSe 2 shows larger interlayer spacing and higher electronic conductivity, which are beneficial for the acceleration of reaction kinetics and capacity improvement. In addition, direct growth of 1T-MoSe 2 nanoflakes on TiC/C skeleton could not only enhance the electrical conductivity, but also contribute to reinforced structural stability. Accordingly, 1T-MoSe 2 @TiC/C branch-core arrays are demonstrated with higher capacity and better rate performance (184 mA h g -1 at 10 A g -1 ) and impressive durability over 500 cycles with a capacity retention of ~91.8%. Such a phase modulation plus branch-core design provides a general way for synthesis of other high-performance electrode materials for applications in electrochemical energy storage.

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