School of Chemical and Biomedical Engineering, Nanyang, Technological University, 62 Nanyang Drive, 637459 (Singapore) http://www.ntu.edu.sg/home/xwlou/
Angew Chem Int Ed Engl. 2014 Apr 1;53(14):3711-4. doi: 10.1002/anie.201400226. Epub 2014 Mar 3.
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.
中空纳米结构在各种应用中具有很大的兴趣。尽管取得了巨大的进展，但各向异性中空结构的合成仍然极具挑战性。在这项工作中，我们开发了一种简单的牺牲模板法来合成具有可调组成的均匀 Ni(x)Co(3-x)S4 中空纳米棱柱体。首先合成具有可控 Ni/Co 摩尔比的四方纳米棱柱体镍钴醋酸盐氢氧化物前体，用作牺牲模板。用乙硫醇中的硫代乙酰胺（TAA）进行硫化处理后，固体前体棱柱体可以转化为具有明确定义的中空内部的相应 Ni(x)Co(3-x)S4 中空纳米棱柱体。引人注目的结构和组成特征有利于电化学应用。令人印象深刻的是，所得的 Ni(x)Co(3-x)S4 中空棱柱体表现出高比电容和增强的循环稳定性，使它们成为超级电容器的潜在电极材料。
