2D single- or double-layered vanadium oxide nanosheet assembled 3D microflowers: controlled synthesis, growth mechanism, and applications

• Main Authors: Pang, Hongchang, Dong, Yongqiang, Ting, Siong Luong, Lu, Jinlin, Li, Chang Ming, Kim, Dong-Hwan, Chen, Peng
• Other Authors: School of Chemical and Biomedical Engineering
• Format: Article
• Language: English
• Published: 2015
• Subjects: Chemical and Biomedical Engineering
• Online Access: https://hdl.handle.net/10356/81357; http://hdl.handle.net/10220/39234
• Institution: Nanyang Technological University

A facile one-pot solvent-thermal method was developed to synthesize a unique 3D microflower structure assembled from single- or double-layered 2D nanosheets of V4O9 (F-VO). Simply by controlling the precursor concentration, yolk-shelled V4O9 (YS-VO) or bulk V4O9 (B-VO) can be produced instead. The precursor-concentration dependent growth mechanism is proposed. The exceptional catalytic/electrochemical properties and large specific surface area of F-VO promise a wide range of applications. As a proof-of-concept demonstration, we investigate its use in high-performance supercapacitors (∼392 F g−1), and for sensitive detection of H2O2 (with a low detection limit of ∼0.1 μM) and methanol (with a low detection limit of ∼60 μM). Furthermore, we show that F-VO greatly outperforms its counterparts (YS-VO and B-VO) presumably owing to its unique structure and crystal plane orientation.