Sn‐doped induced stable 1T‐WSe <sub>2</sub> nanosheets entrenched on N‐doped carbon with extraordinary half/full sodium/potassium storage performance
Yanru Liu, Zewei Lei, Renping Liu, Xinye Li, Peixun Xiong, Yongjin Luo, Qinghua Chen, Mingdeng Wei, Lingxing Zeng, Qingrong Qian
Abstract
Abstract 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.