ZIF-8/Cu@Co-MOFs/TiO₂ electrode materials based on nickel foam for high-sensitivity non-enzymatic vitamin B2 sensors and high-performance supercapacitors

Highly efficient electrode materials are essential in the advancement of electrochemical sensors and supercapacitors. Photoelectrochemical sensors provide exceptional sensitivity and selectivity for a broad measurement range and the simple design and cost effectiveness bode well for online analyses. Herein, the Cu@Co-MOFs and TiO₂ composite are synthesized by a straightforward hydrothermal technique. ZIF-8 provides sufficient active sites for the growth of Cu@Co-MOFs and TiO₂, while Cu@Co-MOF combines the advantages of Cu and Co to have more complex catalytic active sites and higher catalytic efficiency. TiO₂ added to it utilizes its photocatalytic performance to catalyze the entire reaction. The ZIF-8 and Cu@Co-MOFs materials are synthesized on the surface of a 1 cm x 1 cm porous three-dimensional nickel foam at room temperature, and TiO₂ is attached to the pores by annealing. The ZIF-8/Cu@Co-MOFs/TiO₂ sensor exhibits an exceptional sensitivity of 598.48 μA μM^-1 cm^-2 in the detection of vitamin B2. The ZIF-8/Cu@Co-MOFs/TiO₂ electrode can also be used in supercapacitors due to the large energy density, high power density, extended lifespan, as well as rapid charging and discharging. The reliability and efficacy are highlighted. The multifunctional ZIF-8/Cu@Co-MOFs/TiO₂ structure has great potential in different applications including electrochemical sensing and energy storage. © 2024 IEEE.