Sn-doped induced stable 1T-WSe2 nanosheets entrenched on N-doped carbon with extraordinary half/full sodium/potassium storage performance

At present, there have been some reports on the application of metal phase selenide (1T-MSe 2 ) in the field of energy storage. In this manuscript, a stable Sn-doped metal phase tungsten selenide (1T-WSe 2 -Sn) was elaborately fabricated in situ by a simple calcination technique. N-doping was introduced by employing chitosan as precursor and nanoreactor, the Sn-doping induces 1T phase of WSe 2 and enlarges the layer space to promote the electron/ion transport and structural stability. The optimized 1T-WSe 2 -Sn electrode delivers prominent cycling lifespan (285 mAh·g −1 at 1.0 A·g −1 after 900 cycles) along with decent rate capability when applied as an anode of sodium ion batteries (SIBs). The specific capacity was determined to be of 460 mAh·g −1 at 0.1 A·g −1 after 100 cycles. It also displays superior capacity of 183 mAh·g −1 at 0.5 A·g −1 for 200 cycles when paired with Na 3 V 2 (PO 4 ) 3 cathode. Applied as the anode for potassium ion batteries (PIBs), it exhibits a satisfactory specific capacity of 345 mAh·g −1 at 0.1 A·g −1 after 50 cycles. Graphical abstract