Facile synthesis of amorphous aluminum vanadate

hierarchical microspheres for supercapacitors

Yan Yan, Hao Xu, Wei Guo, Qingli Huang, Mingbo Zheng, Huan Pang* and Huaiguo Xue*

College of Chemistry and Chemical Engineering, Yangzhou University

Abstract: Micro-nanostructured mixed metal vanadates have recently garnered enormous attention owing to their remarkable performances in catalysis, energy storage and conversion. In this work, we report the synthesis of amorphous aluminum vanadate hierarchical microspheres via a simple hydrothermal approach with polyvinylpyrrolidone as a surface directing agent. Amorphous aluminum vanadate hierarchical microspheres are firstly described as a kind of electrode material for supercapacitors. The measured specific capacitance of the amorphous aluminum vanadate electrode is 497 F g^-1at 1 A g^-1with good stability and a retention capacity of 89% after 10000 cycles. In addition, the fabricated asymmetric supercapacitor device delivered better performance with an extended operating voltage window of 1.5 V, excellent cycle stability (10000 cycles, 85% capacitance retention), high energy density (37.2 W h kg^-1at 1124.4 W kg^-1) and high power density (11250 W kg^-1at 25 W h kg^-1). This study essentially offers a new kind of vanadate as an electrochemical active material for the development of supercapacitors.

Inorganic Chemistry Frontiers，2016，3，791-797；IF=4.532，SCI

文章链接:http://pubs.rsc.org/en/content/articlelanding/2016/qi/c6qi00089d