Bimetallic Mo ₂ TiC ₂ T x -MXene@NiMoO ₄ -Based High-Performance Dual-Mode Electrochemical Platform for Energy Storage and Non-Enzymatic Biomedical Sensors

To meet the growing demands of advanced energy storage and integrated electrochemical sensing technologies, we have presented a bimetallic Mo 2 TiC 2 T x -MXene@NiMoO 4 -based dual-mode electrochemical platform exhibiting high energy storage and biosensing performance. Electrochemical investigations in a standard three-electrode setup demonstrated the efficient faradaic redox activity and the C s of 1917.74 C g −1 , exhibiting the synergistic charge storage mechanism, combining double-layer capacitance with redox-based energy storage. The present developed Mo 2 TiC 2 Tx@NiMoO 4 //AC asymmetric device exhibited remarkable electrochemical performance, with C s = 321.44 C g −1 , the highest energy density (E d ) of 45 Wh kg −1 , and the power density (P d ) of 2467 W/kg. This device can deliver prolonged cycling stability with 80% retention over 5000 continued cycles. The EIS equivalent circuit presents the series resistance (R s ) = 2.45 Ω and charge transfer resistance (Rct) = 11 Ω. The highly stable properties of the present electrode also lead to an effective non-enzymatic uric acid sensor, showing high sensitivity (S) of 0.00468 μA/μM, LOD of 0.1323 μM (at S/N = 3), and LOQ of 0.441 μM, with a wide linear sub-micromolar detection range (LOR) of 50–1200 μM, and showed an excellently stable and selective UA detection response.