Carbendazim (CBZ) is widely used for crop protection and its residues threaten human health and the environment. Therefore, developing an effective electrocatalyst is important for the extremely sensitive detection of CBZ. Lattice-strain engineering is an effective strategy to change its electronic structure and ultimately optimize the catalytic performance of materials, which can be used as a modification method to improve the detection performance of electrochemical sensors. Herein, a NiFeLDH@HsGY-NH2/MWCNTs heterojunction with strain effect is prepared by the electrostatic self-assembly method. The structure, morphology, composition, crystallinity and electrochemical performance of NiFeLDH@HsGY-NH2/MWCNTs are analyzed using various instrumental techniques, in which geometric phase analysis (GPA) and X-ray diffraction (XRD) images confirm the lattice-strain generated in NiFeLDH@HsGY-NH2/MWCNTs. The results indicate that the prepared electrochemical sensor exhibited an excellent response for carbendazim (CBZ) in the linear range of 0.05–50.00 μM with a detection limit of 10.00 nM (S/N = 3) under the optimal detection conditions. By analyzing the reasons for the improvement of the catalytic performance of the composite material, it is found that the composite of MWCNTs not only improves the conductivity of NiFeLDH but also regulates the electronic structure of metal atoms through double effects. This study provides new insights into the design of efficient and low-cost catalysts to facilitate electrochemical sensor applications.
To address the challenges of the chlorine evolution reaction (CER) and catalyst corrosion in seawater electrolysis, this study developed a chromium-doped nickel-iron layered double hydroxide catalyst. This catalyst operates continuously for 100 h in alkaline seawater, showing consistent increases in activity. Chromium (Cr) doping strengthens the metal-oxygen (M-O) bond, inhibits the loss of lattice oxygen, and facilitates a shift toward the adsorbate evolution mechanism in the reaction pathway. Additionally, CrO 4 2- , produced by the in-situ oxidation and dissolution of Cr 3+ , establishes a dynamic “oxidation-dissolution-adsorption” equilibrium at the interface. This significantly reduces chloride ion (Cl - ) adsorption, corrosion, and the energy barriers of reactions. The introduction of a methanol-assisted system further decreases the overpotential. An electrolyzer that incorporates this system with Pt/C achieves efficient hydrogen production at a current density of 100 mA cm −2 and a voltage of 1.45 V.
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