Designing heterostructure nanocomposite comprised of Sn3O4 nanoflowers and g-C3N4: An advanced flexible supercapacitor electrode

초록

A heterostructure nanocomposite consisting of pseudocapacitive Sn3O4 nanoflowers and EDLC-type graphitic carbon nitride ( g-C3N4) nanosheets was fabricated employing a straightforward in-situ hydrothermal strategy to be employed as a positive electrode in an asymmetric supercapacitor (ASC). Sn3O4 nanoflowers have the potential to offer abundant reactive centers on the electrode surface. Incorporating 2D- g-C3N4 nanosheets further offers a high nitrogen-rich (pyridinic-N and pyrrolic-N content) redox active surface, excess electrons, large surface area, and chemical robustness, which improves the conductivity and restricts agglomeration of Sn3O4, thereby boosting the overall electrochemical capacitive performance of the system. Considering the smart association and appropriate morphological features, Sn3O4/g-C3N4 nanocomposite electrode exhibited ameliorated electrochemical actions delivering a specific capacitance of 1088 F/g in a three-electrode configuration. Furthermore, the Sn3O4/g-C3N4 as an electrode (positive) in ASC device delivered an optimal specific capacitance of 116 F/g at 1 A/g in organic electrolyte, having augmented power and energy density of 7996 W/kg and 66 W h/kg, correspondingly. The functional implication of the supercapacitor device was evidenced by its potential to ignite light-emitting diodes of multiple colors, and it demonstrated similar to 91 % retention of the specific capacitance over 10,000 cycles. Viscous ionic electrolyte was also used to create a flexible ASC prototype, indicating its potential for sophisticated wearable and flexible supercapacitors. In order to synthesize a highperformance hybrid electrode material for an advanced supercapacitor, the synthetic approach for Sn3O4/g-C(3)N(4)preparation and device fabrication technology may be beneficial decidedly.

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