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Hydrogen peroxide (H 2 O 2 ) is the most significant reactive oxygen species in biological systems. Here, we reported an electrochemical sensor for the detection of H 2 O 2  on the basis of bimetallic gold-platinum nanoparticles (Au 3 Pt 7  NPs) supported by Co-based metal organic frameworks (Co-MOFs). First, Au 3 Pt 7  NPs, with optimal electrocatalytic activity and accessible active surface, can be deposited on the surface of the Co-MOF–modified glassy carbon electrodes (Au 3 Pt 7 /Co-MOFs/GCE) by one-step electrodeposition method. Then, the electrochemical results demonstrated that the two-dimensional (2D) Co-MOF nanosheets as the supporting material displayed better electrocatalytic properties than the 3D Co-MOF crystals for reduction of H 2 O 2 . The fabricated Au 3 Pt 7 /2D Co-MOF exhibited high electrocatalytic activity, and the catalytic current was linear with H 2 O 2  concentration from 0.1 μM to 5 mM, and 5–60 mM with a low detection limit of 0.02 μM (S/N = 3). The remarkable electroanalytical performance of Au 3 Pt 7 /2D Co-MOF can be attributed to the synergistic effect of the high dispersion of the Au 3 Pt 7  NPs with the marvelous electrochemical properties and the 2D Co-MOF with high-specific surface areas. Furthermore, this sensor has been utilized to detect H 2 O 2  concentrations released from the human Hela cells. This work provides a new method for improving the performance of electrochemical sensors by choosing the proper support materials from diverse crystal morphology materials.

Direct Electrodeposition of Bimetallic Nanostructures on Co-Based MOFs for Electrochemical Sensing of Hydrogen Peroxide