Recent advances in layered double hydroxides‐based electrochemical sensors: Insight in transition metal contribution

Abstract

Among the nanomaterials reported in the literature, layered double hydroxides (LDHs) are considered promising for the electrochemical sensor technology. Transition metal-based layered double hydroxides (TM-LDHs) show excellent electrocatalytic properties that facilitate redox reactions with analytes, e. g. H 2 O 2 , glucose or glyphosate. Elaboration of porous nano-structures with TM-LDHs nanosheets on the electrode surface allows a rapid diffusion of the analytes and a good accessibility of the TM active sites. An association of TM-LDHs with conductive materials, e. g. graphene or metal nanoparticles (M-NPs), improves the electronic conductivity in the LDH-based composites and also the electrocatalytic activity. With a selection of recent publications, the present mini-review aims to discuss about the specific electrocatalytic role played by TMs (Ni, Co, Cu, Mn and Fe) present in the LDH layers on the performance (sensitivity and detection limit) of these TM-LDHs-based sensors.

A Facile Glycerol-Assisted Synthesis of Low-Cu2+-Doped CoFe2O4 for Electrochemical Sensing of Acetaminophen

“…Taking these results into account, as well as the use of the slope of E p vs. pH, and using Laviron's, a possible redox reaction sequence for the AC was shown in Scheme 1, in which two electrons transfer and the inclusion of the protons was involved in the oxidation of acetaminophen (AC) to N-acetyl-p-benzoquinone-imine (NAPQI). The DPV voltammograms, which reported current peaks and were directly correlated with the AC concentration, were acquired using a PBS buffer with a pH of 2.5 as a supporting electrolyte [76]. Figure 6B-D presents the DPVs voltammograms of AC with increasing concentrations at the (a) S-013/GCE, (b) GCE bare, and (c) S-028/GCE electrode.…”

CuO/CoZn-Layered Double-Hydroxide Nanowires on Carbon Cloth as an Enzyme-Free H2O2 Sensor

“…Transition metal oxides and transition metal based layered double hydroxide (LDH) have been paid more and more attention in electrochemical sensors . For example, Lohar et al synthesized CuO/reduced graphene oxide (CuO/rGO) nanopellets by the coprecipitation method and loaded them on indium tin oxide substrate for the detection of glucose and H 2 O 2 with high sensitivity .…”

Highly stable non-enzymatic glucose sensor based on ternary NiCoFe-layered hydroxide grown on graphene oxide

“…7 In contrast, transition metals, transition metal oxides, and transition metal hydroxides have broader applicability due to their abundant availability, cost-effectiveness, and excellent stability. 8,9 The extensive research in electrochemical catalysis is driven by the remarkable electrocatalytic activity and highly tunable composition and structure of layered double hydroxides (LDHs). 10 In addition, LDHs offer the advantages of being environmentally friendly and inexpensive.…”