Facile preparation of well conductive 2D MOF for nonenzymatic detection of hydrogen peroxide: Relationship between electrocatalysis and metal center

Due to its nano-thickness, fast mass transfer and excellent electron transfer capability, two-dimensional (2D) MOF are an efficient strategy to develop good electrocatalytic materials. In this paper, 2D-MOF were synthesized by facile and cost-efficient methods. MOF can be fast prepared with nucleation and crystal growth in several minutes at room temperature, leading to very thin 2D Co-MOF. Herein, Co, Ni and NiCo-based 2D MOF as non-enzymatic H2O2 sensors at different oxidation potentials in KOH solution, the Co-MOF exhibited excellent H2O2 oxidation and detection performance including a wide linear range from 0.5 mu M to 832.5 mu M, low detection limit of 0.69 mu M, and very fast sensing response in basic solution. By taking advantage of excellent conductivity, the Co-MOF showed the low oxidation potential for H2O2 and good detection performance at 0.25 V. It was comparable to most carbon materials and reported MOF materials for H2O2 detection. We insist that 2D MOF is effective for creating active catalysts. The 2D Co-MOF performed higher electrochemical sensitivity with high stability, conductivity, and selectivity. It indicates 2D MOF has potential employment in the fabrication of sensing devices. (C) 2019 Elsevier B.V. All rights reserved.