Facile synthesis of honeycomb-structured Co–W–B composite for high-performance supercapacitors

Facile synthesis of honeycomb-structured Co–W–B composite for high-performance supercapacitors
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用于高性能超级电容器的蜂窝结构Co-W-B复合材料的简便合成

DOI:
10.1016/j.apsusc.2017.12.013
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发表时间:
2017-12
影响因子:
6.7
通讯作者:
Yongjin Zou
Yongjin Zou
中科院分区:
材料科学1区
文献类型:
--
作者:
Ying Yin;Cuili Xiang;Hailiang Chu;Huanzhi Zhang;Xu Fen;Erhu Yan;Lixian Sun;Chengying Tang;Yongjin Zou

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采用简单的化学还原法在乙醇溶液中制备了蜂窝状Co-W-B复合材料。利用扫描电镜、透射电镜和X射线衍射仪对Co-W-B复合材料的结构和形貌进行了表征。结果表明,该复合材料在空气中氧化后主要由Co、W和B的氧化物组成,是一种适用于高性能赝电容器的材料。电化学测试表明,在2 A g-1的电流密度下,Co-W-B复合材料的比电容为306.3 F g-1,远高于Co-B复合材料的比电容。此外,Co-W-B复合材料具有良好的稳定性,在2500次循环后,其电容量仍保持其初始电容量的89.2%。这些结果表明,蜂窝结构的Co-W-B复合材料有希望用作超级电容器的电极材料。
A honeycomb-structured Co–W–B composite was prepared by a simple chemical reduction process in an alcohol solution. The structure and morphology of the Co–W–B composite was characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The results indicate that the composite was mainly composed of oxides of Co, W, and B as a result of oxidation in air, and it was a suitable material for high-performance pseudocapacitors. Electrochemical tests indicated that the Co–W–B composite exhibited a specific capacitance of 306.3 F g–1at a current density of 2 A g–1, which is much higher than that of a Co–B composite. Furthermore, the Co–W–B composite showed good stability, and the capacitance retained 89.2% of its initial capacitance after 2500 cycles. These results demonstrate that the honeycomb-structured Co–W–B composite is promising for use as an electrode material for supercapacitors.
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