Facile Chemical Synthesis and Potential Supercapattery Energy Storage Application of Hydrangea-type Bi₂MoO₆

Soft chemical synthesis is used to obtain a hydrangea-type bismuth molybdate (Bi₂MoO₆) supercapattery electrode that demonstrates considerable energy/power density and cycling life. Structure and morphology studies, initially, reveal a phase-pure polycrystalline and hydrangea-type surface appearance for Bi₂MoO₆, which upon testing in an electrochemical energy storage system displays supercapattery behavior, a combination of a supercapacitor and a battery. From the power law, an applied-potential-dependent charge storage mechanism is established for the Bi₂MoO₆ electrode material. A Trasatti plot evidences the presence of inner and outer surface charges. The hydrangea-type Bi₂MoO₆ electrode demonstrates a specific capacitance of 485 F g^-1 at 5 A g^-1 and a stability of 82% over 5000 cycles. An assembled symmetric supercapattery with a Bi₂MoO₆//Bi₂MoO₆ configuration demonstrates energy and power densities of 45.6 W h kg^-1 and 989 W kg^-1, respectively. A demonstration elucidating the lighting up of three light-emitting diodes, connected in series, by the symmetric supercapattery signifies the practical potentiality of the as-synthesized hydrangea-type Bi₂MoO₆ electrode in energy storage devices.