Biphasic Ni-MXene Quantum-Confined Nanostructures: A Versatile Janus Platform for Advanced Energy Storage and Catalytic Oxidations.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40765213.
- Also identified by DOI 10.1002/adma.202505852 and PMC identifier 12617060.
- Licence recorded as CC BY-NC-ND.
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Abstract
The demand for sustainable energy storage and ecofriendly catalysts has intensified the search for advanced multifunctional materials. Herein, this work presents the synthesis and characterization of Janus Ni-MXene quantum dot (Ni-MJQD), a novel material architecture that exhibits high performance in supercapacitor and catalytic applications. A Ni-MJQD cathode delivers an impressive gravimetric specific capacity of 168.75 mAh g<sup>-1</sup> at 3 A g<sup>-1</sup>, and its Janus structure optimizes the balance between capacity and ion diffusion. In an asymmetric hybrid supercapacitor (AHSC) with a porous activated carbon (PAC) anode, it achieves an energy density of 54.22 Wh kg<sup>-1</sup>, a power density of 1599 W kg<sup>-1</sup>, and 88% capacity retention over 20 000 cycles. As a catalyst, the Ni-MJQD also exhibits high activity in benzyl alcohol oxidation, reaching 95% conversion and 98.4% selectivity for benzaldehyde, with the largest turnover frequency of 8.8825 × 10<sup>-3</sup> moles g<sup>-1</sup> h<sup>-1</sup> using peroxymonosulfate (PMS) as an oxidant. Mechanistic analysis reveals contributions from both radical and nonradical pathways. These findings emphasize the unique potential of the Ni-MJQD electrodes for sustainable energy storage and green synthesis applications.