title: Formation of Ni(x)Co(3-x)S₄ hollow nanoprisms with enhanced pseudocapacitive properties.
abstract: Hollow nanostructures are of great interest for a wide variety of applications. Despite the great advances, synthesis of anisotropic hollow structures is still very challenging. In this work, we have developed a simple sacrificial template method to synthesize uniform Ni(x)Co(3-x)S4 hollow nanoprisms with tunable composition. Tetragonal nanoprisms of nickel-cobalt acetate hydroxide precursors with controllable Ni/Co molar ratios are first synthesized and used as the sacrificial templates. After a sulfidation process with thioacetamide (TAA) in ethanol, the solid precursor prisms can be transformed into the corresponding Ni(x)Co(3-x)S4 hollow nanoprisms with a well-defined hollow interior. The intriguing structural and compositional features are beneficial for electrochemical applications. Impressively, the resultant Ni(x)Co(3-x)S4 hollow prisms manifest a high specific capacitance with enhanced cycling stability, making them potential electrode materials for supercapacitors.
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang, Technological University, 62 Nanyang Drive, 637459 (Singapore) http://www.ntu.edu.sg/home/xwlou/
authors.forename: Le
authors.initials: L
authors.lastname: Yu
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Hao Bin
authors.initials: HB
authors.lastname: Wu
authors.forename: Xiong Wen David
authors.initials: XW
authors.lastname: Lou
keywords: cobalt; nanostructures; nickel; prisms; supercapacitors