Formation of Ni(x)Co(3-x)S₄ hollow nanoprisms with enhanced pseudocapacitive properties.
Formation of Ni(x)Co(3-x)S₄ hollow nanoprisms with enhanced pseudocapacitive properties.
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DOI：
10.1002/anie.201400226
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发表时间：
2014-04
影响因子：
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通讯作者：
Le Yu;Lei Zhang;H. Wu;X. Lou
中科院分区：
文献类型：
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作者：
Le Yu;Lei Zhang;H. Wu;X. Lou
空心纳米结构具有广泛的应用前景。尽管取得了很大的进步，但各向异性空心结构的合成仍然非常具有挑战性。在这项工作中，我们开发了一种简单的牺牲模板方法来合成具有可调成分的均匀Ni(x)Co(3-x)S4空心纳米棱镜。首次合成了Ni/Co摩尔比可控的羟基乙酸镍钴前驱体的四方纳米棱镜，并将其作为牺牲模板。经硫乙酰胺（TAA）在乙醇中磺化处理后，固体前驱体棱镜可转化为相应的Ni(x)Co(3-x)S4中空纳米棱镜，其内部具有明确的中空结构。其独特的结构和组成特征有利于电化学应用。令人印象深刻的是，所得到的Ni(x)Co(3-x)S4中空棱镜具有高比电容和增强的循环稳定性，使其成为超级电容器的潜在电极材料。
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.