Abstract
Ultralong (NH4)2V6O16·1.5H2O nanobelts were synthesised by a combination of sol–gel and hydrothermal methods. The chemical composition, morphology and microstructure of products were characterised by X-ray powder diffraction, Fourier transform infrared spectroscopy, field emission SEM and TEM respectively. Typical (NH4)2V6O16·1.5H2O nanobelts are several hundreds of micrometres in length, 50 − 100 nm in thickness and 200 − 500 nm in width. It is indicated that ions are critical to the formation of ultralong nanobelts. Electrochemical performance shows that (NH4)2V6O16·1.5H2O nanobelts can exhibit a specific capacitance as high as 220 F g− 1 at 0.05 A g− 1 over a potential range of − 0.1–0.9 V in 1M NaNO3 due to their high conductivity and ion diffusion rate. This work provides new insights for the growth of ultralong NH4V3O8 nanobelts and their application in supercapacitors.
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