[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−1 at 3 A g−1, 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−1, a power density of 1599 W kg−1, 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 × 10−3 moles g−1 h−1 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.

[Article Information]

 - Source title: Advanced Materials, 37(45), e05852

- DOI: 10.1002/adma.202505852

[Author PURE profile]

Associate Professor Seung Hwa Yoo

- Department of Quantum System Engineering