Elevated symmetric supercapacitor performance and simulated solar light-functioning H₂O₂ production using single-step fabricated 2D/2D NiAl-based LDH/CoNi-based MOF nanohybrid

Combining photocatalytic hydrogen peroxide (H₂O₂) production with supercapacitors offers a synergistic solution to address both solar-driven catalysis and energy storage challenges. In this connection, this study explored a novel, one-step thermal impregnation method for synthesizing a high-performance nanohybrid material. The unique combination of nickel-aluminum layered double hydroxides (NiAl-L) and Co/Ni-based metal-organic framework (CoNi-M) synergistically enhances electrochemical performance, leading to improved energy storage capacity. Interestingly, the NiAl-L/CoNi-M nanohybrid heterojunction exhibits remarkable characteristics in a three-electrode system, achieving an impressive specific capacitance of 2672.3 Fg^–1 at 1 A g^–1. It also demonstrates outstanding cyclic stability, retaining 93.6 % of its capacity even after 5000 galvanostatic charge-discharge (GCD) cycles. Moreover, the symmetrical supercapacitor device made of NiAl-L/CoNi-M demonstrates outstanding performance, sustaining 90.9 % capacity after 5000 GCD cycles, with a specific capacitance of 309.7 Fg^–1 at 1 Ag^–1 and a high energy density of 43 WhKg^–1. Additionally, the synergistic combination of NiAl-L and CoNi-M enhances the photocatalytic performance, achieving an H₂O₂ evolution rate of 334.86 μmol L^–1 h^–1 under simulated solar light irradiation. This rate is 2.61, 3.81, and 5.81 times greater than that of pure CoNi-M, Co-M, and NiAl-L, respectively, highlighting the potential of NiAl-L/CoNi-M nanohybrid for sustainable energy application.