One-Step Electrodeposition of Silver Nanostructures on 2D/3D Metal–Organic Framework ZIF-67: Comparison and Application in Electrochemical Detection of Hydrogen Peroxide

Abstract

Metal–organic frameworks (MOFs) have been widely used as supporting materials to load or encapsulate metal nanoparticles for electrochemical sensing. Herein, the influences of morphology on the electrocatalytic activity of Co-containing zeolite imidazolate framework-67 (ZIF-67) as supporting materials were studied. Three types of morphologies of MOF ZIF-67 were facilely synthesized by changing the solvent because of the influence of the polar solvent on the nucleation and preferential crystal growth. Two-dimensional (2D) ZIF-67 with microplate morphology and 2D ultrathin ZIF-67 nanosheets were obtained from pure H2O (H-ZIF-67) and a mixed solution of dimethylformamide and H2O (D-ZIF-67), respectively. Three-dimensional ZIF-67 with rhombic dodecahedron morphology was obtained from pure methanol (M-ZIF-67). Then, one-step electrodeposition of silver nanostructures on ZIF-67-modified glassy carbon electrode (Ag/ZIF-67/GCE) was performed for the reduction of hydrogen peroxide (H2O2). Cyclic voltammetry can be used to investigate the electrocatalytic activity of Ag/ZIF-67/GCE, and Ag/H-ZIF-67/GCE displayed the best electrocatalytic property than Ag/D-ZIF-67/GCE and Ag/M-ZIF-67/GCE. The electrochemical H2O2 sensor showed two wide linear ranges of 5 μM to 7 mM and 7 to 67 mM with the sensitivities of 421.4 and 337.7 μA mM–1 cm–2 and a low detection limit of 1.1 μM. In addition, the sensor exhibited good selectivity, high reproducibility, and stability. Furthermore, it has been utilized for real-time detection of H2O2 from HepG2 human liver cancer cells. This work provides a novel strategy for enhancing the detection performance of electrochemical sensors by changing the crystalline morphologies of supporting materials.

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

“…In this work, two kinds of pristine Co-MOF materials were prepared according to the published method with some improvements ( Zhao et al, 2015 ; Sun et al, 2020 ).…”

Highly efficient Ag doped δ-MnO2 decorated graphene: Comparison and application in electrochemical detection of H2O2

“…A short number of metal doping reports are available for electrocatalysis due to its complex creation and tough acceptance [31] . Among different metal nanoparticles (NPs), silver NPs (Ag NPs) have been significantly reported as an effective H 2 O 2 sensor due to large surface area, high conductivity, good biocompatibility, and low toxicity [1] , [5] , [18] , [32] , [33] . But Ag NPs suffer from severe aggregations because of the strong van der Waals force and high surface energy of nano-sized particles [5] , [31] .…”

Silver Nanowires as Electron Transfer Mediators in Electrochemical Catechol Biosensors

“…In the last few years, a number of electrochemical biosensors combining phenol oxidases with a variety of materials, such as polymeric matrices [5,6] or nanomaterials, Sensors 2021, 21, 899 2 of 13 have been developed [7,8]. Carbon nanotubes (CNTs) [9,10] graphene [11,12], carbon fibers [13], metallic nanoparticles, metal oxide nanoparticles, nanostars [14][15][16][17][18], molecular imprinted polymers [19], and nanostructured thin films [20,21] have all been shown to be excellent electron mediators. One-dimensional (1D) nanostructures can be an interesting alternative to zero-dimensional (OD) nanoparticles due to their high surface-to-volume ratios.…”