Synthesis and characterization of belt-like VO₂(B)@carbon and V₂O₃@carbon core-shell structured composites

详细信息	查看全文 | 推荐本文 |

• 作者：Yifu Zhang^a ; Fangfang Zhang^b ; Lei Yu^a ; Meijuan Fan^b ; Yalan Zhong^a ; Xinghai Liu^b ; ^{liuxh@whu.edu.cn} ; Yongyun Mao^a ; Chi Huang^a ; ^c ; ^{chihuang@whu.edu.cn}
• 关键词：Nanocomposites ; VO2(B)@C ; V2O3@C ; Core&ndash ; shell structure ; Carbon ; Interface reaction
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2012
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：20 February, 2012
• 卷：396
• 期：Complete
• 页码：144-152
• 文件大小：1329 K

摘要

VO₂(B) nanobelts encapsulated into carbon core-shell structured composite (VO₂(B)@C) was successfully synthesized using VO₂(B) nanobelts as the cores and glucose as the shells via an environmental hydrothermal method. The 鈥渁dsorption carbonization growth鈥?(ACG) mechanism was proposed to explain the formation of VO₂(B)@C. The influence of synthetic parameters, such as, the reaction temperature, concentration of glucose and reaction time, was systematically investigated to control the fabrication of VO₂(B)@C. Subsequently, belt-like V₂O₃@C core-shell structured composite was prepared by the heating treatment of VO₂(B)@C. Furthermore, the electrochemical properties of this novel belt-like V₂O₃@C core-shell structured composite was studied, indicating that it exhibits an initial discharge capacity of as high as 162 mAh/g and the discharge capacity is still 104, 89, 67 mAh/g after 30, 50, and 89 cycles, which is much higher than pure V₂O₃. The phase transition properties of V₂O₃ powder and V₂O₃@C composite were investigated by DSC, which revealed that V₂O₃@C has the same phase transition properties of V₂O₃. The as-obtained V₂O₃@C composite has potential applications to the cathode and functional positive temperature coefficient (PTC) materials.