Fabrication of rGO@MnSiO3 sandwich-like structure boosts the electrochemical properties of MnSiO3 for high-performance energy storage devices

Recently, emerging researchers suggest that manganese silicate (MnSiO3) has immense potential as electrode for supercapacitors (SCs). However, MnSiO3's electrochemical performances in the reported literature are achieved far from desirableness owing to its poor electrochemical conductivity. Herein, we develop the honeymelon striated MnSiO3 coated on rGO sandwich-like structure ([email protected]3) to improve the energy-storing capabilities of MnSiO3. The [email protected]3 is fabricated using the [email protected]2 templates by a facile hydrothermal procedure. The [email protected]3 is composed of rGO conductive inner core and MnSiO3 outer layer with the honeymelon-like shape. This integrated structure avoids the inactive electronic conducting trouble caused by the conventional MnSiO3 and rGO two-phase mixture system. At 0.5 A/g, the [email protected]3 electrode shows the specific capacitance of 576 F/g, which goes beyond rGO + MnSiO3 of 70 F/g, MnSiO3 of 90 F/g, and rGO of 70 F/g. At 1 mA/cm2, the [email protected]3 symmetrical SC ([email protected]3 SSC) device shows the capacitances of 565 mF/cm2 and illuminates the LED lamp for 3 min. This work not only demonstrates that the [email protected]3 sandwich-like structure can significantly promote the energy-storing capabilities of MnSiO3 but also provides a strategy for the synthesis of the homogeneous [email protected] metal silicates construction that is beneficial to the electron and mass transfer in kinetics for energy storage and conversion.