Freestanding Binder-Free Electrodes with Nanodisk-Needle-like MnCuCo-LTH and Mn1Fe2S2 Porous Microthorns for High-Performance Quasi-Solid-State Supercapacitors

Transition-metal-based layered triple hydroxides (LTHs) are evolving as potential positrode candidates for high-performance supercapacitors; however, their phase stabilization is still critical. Alongside, the availability of limited negatrodes pushes research toward exploring novel alternatives in order to minimize performance limitation issues in the fabricated supercapacitors. Herein, a facile strategy for stabilizing freestanding MnCuCo-LTH-based positrode possessing intermingled nanodisk-needle-like morphology is reported. Alongside, novel high-surface-area negatrodes based on Mn1Fe2S2 exhibiting porous microthorn-like morphology are also optimized. MnCuCo_LTH and Mn1Fe2S2 exhibit remarkably high specific capacities of similar to 494 mAh g(-1) (similar to 2540 F g(-1)) and similar to 429 mAh (similar to 1546 F g(-1)), respectively, at 1 A g(-1). The fabricated quasi-solid-state supercapacitor equipped with a poly(vinyl alcohol) (PVA)-KOH gel electrolyte displays a high specific capacity of similar to 144 mAh g(-1) and a specific capacitance of similar to 325 F g(-1) at 1 A g(-1). The ultrahigh energy cum power traits of similar to 105 Wh kg(-1) (1 A g(-1)) and similar to 8370 W kg(-1) (at 10 A g(-1)) establish an asymmetric supercapacitor as a high-performance energy storage device. This device shows an appreciably high cycling life with a capacitance retention of similar to 93% after 10 000 consecutive cycles, at 10 A g(-1). This approach provides a neoteric foresight for developing high-performance advanced energy storage devices equipped with cheaper and eco-friendly components.

Automated summary

This study presents a facile strategy for stabilizing layered triple hydroxides (LTHs) based positrode and optimizing Mn1Fe2S2 based negatrodes for high-performance supercapacitors. The fabricated quasi-solid-state supercapacitor exhibits high specific capacity, specific capacitance, energy, and power performance, along with excellent cycling life. This approach provides a neoteric foresight for developing high-performance advanced energy storage devices equipped with cheaper and eco-friendly components.