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-MSe2) in the field of energy storage. In this manuscript, a stable Sn-doped metal phase tungsten selenide (1T-WSe2-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 WSe2 and enlarges the layer space to promote the electron/ion transport and structural stability. The optimized 1T-WSe2-Sn electrode delivers prominent cycling lifespan (285 mAh center dot g(-1) at 1.0 A center dot 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 center dot g(-1) at 0.1 A center dot g(-1) after 100 cycles. It also displays superior capacity of 183 mAh center dot g(-1) at 0.5 A center dot g(-1) for 200 cycles when paired with Na3V2(PO4)(3) cathode. Applied as the anode for potassium ion batteries (PIBs), it exhibits a satisfactory specific capacity of 345 mAh center dot g(-1) at 0.1 A center dot g(-1) after 50 cycles.

Automated summary

In this study, stable Sn-doped metal phase tungsten selenide (1T-WSe2-Sn) was fabricated using a simple calcination technique. N-doping and Sn-doping were introduced to promote electron/ion transport and improve structural stability. The optimized 1T-WSe2-Sn electrode exhibited remarkable cycling lifespan and rate capability when applied in sodium ion batteries (SIBs) as an anode, as well as in potassium ion batteries (PIBs).