▎ 摘　　要

The layered structure stability of bulk vanadyl phosphate dihydrate (VOPO4 center dot 2H(2)O) is investigated by using a deintercalation-intercalation reaction process involving short-range swelling, its basal spacing can be reversibility controlled and the layered structure can be maintained to above 400 degrees C. By using delaminated vanadyl phosphate (VOPO4) nanosheets in 2-propanol, VOPO4/reduced graphene oxide (RGO) hybrid electrode materials for supercapacitor with different mass ratios of VOPO4 nanosheets to graphene oxide (GO) nanosheets have been prepared based on a nanosheet reassembling reaction between the exfoliated VOPO4 nanosheets and GO nanosheets and followed by calcinating in a tubular furnace at 400 degrees C for 3 h under N-2 atmosphere, and their electrochemical properties are systematically investigated by cyclic voltammetry and galvanostatic charge-discharge in 0.5 M K2SO4 electrolyte. The VOPO4/RGO hybrid electrode with a mass ratio of VOPO4/RGO = 1 exhibits a high specific capacitance of 378 F g(-1) at a scan rate of 5 mV s(-1) with a good rate capability. This method broadens the application filed of VOPO4 nanosheets, and also supplies promising electrode candidates for supercapacitor. (C) 2015 Elsevier Ltd. All rights reserved.