V2CTx-MXene/winery waste derived carbon-VO2/V2C-MXene aerogel based high-performance cathode for quasi-solid-state Zn-ion batteries

초록

Biomass-derived carbon aerogels with heterostructure integrity have more reactive sites than pure carbon due to structural distortions. Herein, layered V2CTx MXene was integrated with winery waste-derived activated carbon to fabricate a hierarchical porous V2C/VO2-N-doped carbon (V2C/VO2-NC) aerogel through an agarose-assisted carbonization process. Leveraging the additional active sites, V2C/VO2 promotes high Zn-ion adsorption capacitance through its hierarchical porous structure, and the carbon integrity maximizes conductivity and stability. The V2C/VO2-NC aerogel outperforms V2CTx MXene and activated carbon with a wider potential window (0.2-1.6 V), high specific capacity (457.8 mA h g-1 at 0.2 A g-1), excellent cyclic stability (83.7 % capacity retention at 10 A g-1 after 5000 cycles), and high-rate capacity (297.9 mA h g-1 at 2 A g-1). Hierarchical porous V2C/VO2-NC aerogel-based quasi-solid-state Zn-ion batteries offer excellent energy density, adaptability, and stability, achieving 1500 cycles with 100 % columbic efficiency. This study presents a sustainable biomass-derived route for fabricating hierarchical porous MXene/carbon-based aerogel hybrids, offering a promising pathway towards next-generation electrode materials for high-performance wearable energy storage devices.

키워드