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

• Published in: Applied surface science Vol. 460; pp. 25 - 32
• Main Authors: Yin, Ying, Xiang, Cuili, Chu, Hailiang, Zhang, Huanzhi, Fen, Xu, Yan, Erhu, Sun, Lixian, Tang, Chengying, Zou, Yongjin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2018
• Subjects: Co3O4; Co–W–B; Honeycomb structure; Supercapacitor; WO3; Supercapacitor; WO3; Honeycomb structure; Co–W–B; Co3O4
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.12.013

•Honeycomb-structured Co–W–B composite was prepared by simple chemical reduction.•The Co–W–B composite was mainly composed of oxides of Co, W, and as a result of oxidation in air.•The Co–W–B composite shows high surface area, large pore volume, and good stability.•The Co–W–B composite exhibited a specific capacitance of 306.3 F g–1 at a current density of 2 A g–1.
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–1 at 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.