Structural Manipulation of Layered TiS₂ to TiS₃ Nanobelts through Niobium Doping for High‐Performance Supercapacitors

Abstract Unraveling the influence of incorporating transition metal elements on layered transition metal chalcogenides for energy storage application remains a challenge. Herein, niobium (Nb)‐doped layered titanium disulfide (TiS 2 ) is applied to generate novel compounds Ti 1−x Nb x S 2 (x=0.05, 0.1 and 0.20). Interestingly, TiS 3 nanobelts are formed in the resulting materials, which is proven by systematic morphological and structural characterization. It has been found that Nb‐doped TiS 2 compounds demonstrate superior electrochemical capacitive activity, reaching up to a 63.2 % increase in gravimetric capacitance in 1 M Na 2 SO 4 electrolyte compared with that of the Nb‐free TiS 2 . This remarkably enhanced capacity behavior is attributed to Nb doping resulting a structural transition of Layered TiS 2 to TiS 3 nanobelts.