The Microwave‐Assisted Hydrothermal Synthesis of CoV2O6 and Co3V2O8 with Morphology Tuning by pH Adjustments for Supercapacitor Applications. Issue 3 (21st January 2019)

• Record Type: Journal Article
• Authors: Teng, Yifei; Li, Yingdi; Yu, Deyang; Meng, Ya'nan; Wu, Yunpeng; Zhao, Xudong; Liu, Xiaoyang
• Is Part Of: ChemistrySelect. Volume 4:Issue 3(2019)
• Page Start: 956
• Page End: 962
• Publication Date: 2019-01-21
• Subjects: Microwave-assisted hydrothermal synthesis -- cobalt vanadates -- supercapacitors -- battery-type -- pH value; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201803141
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Vanadium‐based metal oxides have attracted widespread attention as a promising candidate for electrode materials owing to the novel morphologies and the wide range of practical applications. In this work, the microwave‐assisted hydrothermal synthesis method was used for the first time to synthesize CoV2 O6 micron blocks and Co3 V2 O8 nanoparticles. Briefly, heating the solution to 100 °C and adjusting the pH can result in desired micro blocks and nanoparticles within 10 min. After systematic characterization of material structures and morphologies, the resulted two materials were further fabricated to electrodes, and thoroughly characterized their electrochemical performances. The test results showed that both the two cobalt vanadates had a great potential as supercapacitor electrode materials. Moreover, by adjusting the pH of the solution, the type and morphology of the synthesized product could be precisely controlled, which could largely affect the electrochemical properties of the materials. Abstract : CoV2 O6 micron blocks and Co3 V2 O8 nanoparticles were produced by a microwave‐assisted synthesis approach and the electrochemical properties were systematically characterized. Co3 V2 O8 electrode materials exhibited a better specific capacity of 319.4 F g −1 (1 mA cm −2 ) and better cyclic stability (94.67% of capacitance after 1000 cycles and 4 mA cm −2 ), when compared to CoV2 O6 .