Facile one-pot synthesis of NiCo₂O₄ hollow spheres with controllable number of shells for high-performance supercapacitors

详细信息    查看全文

• 作者：Jing Guo ; Zhihui Yin ; Xiaoxian Zang ; Ziyang Dai ; Yizhou Zhang ; Wei Huang…
• 关键词：NiCo2O4 ; hollow spheres ; controlled number of shells ; supercapacitor
• 刊名：Nano Research
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：10
• 期：2
• 页码：405-414
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Nanotechnology; Materials Science, general; Atomic/Molecular Structure and Spectra; Condensed Matter Physics; Biotechnology; Biomedicine, general;
• 出版者：Tsinghua University Press
• ISSN：1998-0000
• 卷排序：10

文摘

In this work, single- and double-shelled NiCo₂O₄ hollow spheres have been synthesized in situ by a one-pot solvothermal method assisted by xylose, followed by heat treatment. Employed as supercapacitor electrode materials, the double-shelled NiCo₂O₄ hollow spheres exhibit a remarkable specific capacitance (1,204.4 F·g−1 at a current density of 2.0 A·g−1) and excellent cycling stability (103.6% retention after 10,000 cycles at a current density of 10 A·g−1). Such outstanding electrochemical performance can be attributed to their unique internal morphology, which provides a higher surface area with a larger number of active sites available to interact with the electrolyte. The versatility of this method was demonstrated by applying it to other binary metal oxide materials, such as ZnCo₂O₄, ZnMn₂O₄, and CoMn₂O₄. The present study thus illustrates a simple and general strategy for the preparation of binary transition metal oxide hollow spheres with a controllable number of shells. This approach shows great promise for the development of next-generation high-performance electrochemical materials.