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Binary transition metal oxides, such as iron vanadate (FeVO 4 ), possess unleashed potential to be the best electrode material for supercapacitor, owing to their high capacitance, stability and conductivity. This present work reports investigations on the influence of a surfactant, polyethylene glycol (PEG 4000), on the structure, morphology and electrochemical behaviour of FeVO 4  nanoparticles. The P4-FeVO 4  exhibited specific capacitance of 428.0 Fg −1  at a current density of 2.0 Ag −1 , and arguably better performance and cyclic stability than FeVO 4  synthesised without PEG 4000. Thus, PEG 4000 significantly influenced the morphological and electrochemical performance of the FeVO 4 . Furthermore, the assembled P4-FeVO 4  based symmetric capacitor device had a specific capacitance of 101.0 Fg −1  with an energy density of 14.1 Whkg −1 . This improved electrochemical performance of the P4-FeVO 4  based devices is attributed to the physicochemical properties of P4-FeVO 4  nanoparticles, mediated by the PEG 4000.

Polyethylene glycol mediated synthesis of iron vanadate (FeVO4) nanoparticles with supercapacitive features

Polyethylene glycol mediated synthesis of iron vanadate (FeVO₄) nanoparticles with supercapacitive features