Microwave-synthesized Bi2MoO6 nanoplates for high performance symmetric and asymmetric supercapattery devices†

Here, we explore the potential of symmetric and asymmetric configurations for high-performance energy storage using Bi₂MoO₆ (BMO) nanoplates synthesized via a microwave-hydrothermal method. Symmetric devices (BMO//BMO) exhibit a higher specific capacity (∼83 mAh g⁻¹), but lower retention (∼36% after 1250 cycles), while asymmetric devices (BMO//carbon nanotubes (CNTs)) show superior retention (∼85% after 2500 cycles) with a capacity of ∼46.25 mAh g⁻¹. The enhanced redox activity in symmetric format contrasts with the conductive benefits of CNTs in asymmetric systems. This dual evaluation demonstrates the versatility of BMO for both energy density and long-term stability, making it a promising material for high-performance energy storage applications. Furthermore, we provide a detailed analysis of the charge storage mechanism of BMO, which follows a battery-type process driven by intercalation and redox reactions, resulting in its high capacity. The practicality of the BMO//BMO device is demonstrated by lighting red, green, and blue LEDs for 18 minutes, 45 seconds, and 30 seconds, respectively, using two identical supercapacitor cells connected in series.