Scaled-up synthesis of defect-rich layered double hydroxide monolayers without organic species for efficient oxygen evolution reaction

Electrodeposition of Defect‐Rich Ternary NiCoFe Layered Double Hydroxides: Fine Modulation of Co3+ for Highly Efficient Oxygen Evolution Reaction

“…However, the XRD result of Ni(Co 0.5 Fe 0.5 )mono only displayed a (110) peak of LDH at 60.3°and the peak of water in the wet samples at 20°~50°. [18,19] The absence of the (00 l) peak of Ni(Co 0.5 Fe 0.5 )-mono indicated the successful synthesis of monolayer LDH without any stacking along the c-axis, which was consistent with previous literature. [20] In addition, as shown in Figure 1c, the scanning electron microscopy (SEM) image of Ni(Co 0.5 Fe 0.5 )/NF showed dense nanosheets that vertically grown on the NF substrate, forming an open porous structure.…”

“…As reported in many LDH-related studies, the (012) facet observed from HR-TEM images further confirmed the successful preparation of the three crystalline LDHs, [21,22] though the corresponding XRD diffraction peak in Ni(Co 0.5 Fe 0.5 )-mono was not detected due to the concealment of the broad water peak. [18,19] Furthermore, discontinuous lattice was observed for Ni(Co 0.5 Fe 0.5 )/NF, indicating the existence of atomic vacancies and defect sites. [23,24] In order to evaluate the electrocatalytic OER performance of the as-prepared Ni(Co 0.5 Fe 0.5 ) LDHs, a typical three-electrode system in an O 2 -saturated 1 M KOH was applied.…”

Hierarchical NiFe Hydroxide/Ni3N Nanosheet-on-Nanosheet Heterostructures for Bifunctional Oxygen Evolution and Urea Oxidation Reactions

“…Among transition-metal-based compounds, metal hydroxides are recognized as potential candidates for OER and UOR catalysts because of their low cost and tunable properties. ,− However, the poor conductivity of the metal hydroxides is usually detrimental for charge transfer in the catalysis process and further leads to unsatisfactory OER/UOR catalytic performances . Structural engineering by coupling hydroxides with conductive and functional materials is considered as a useful means to enhance the electrocatalytic activity owing to the regulation of the synergistic interfacial effect between the coupling materials. − Transition-metal nitrides with intrinsic metallic properties have been substantially explored as OER electrocatalysts, − while their UOR performance is rarely reported.…”

Layered double hydroxide-based nanomaterials for biomedical applications

“…Apart from the aforementioned top-down strategies, other methods such as aqueous miscible organic solvent treatment (AMOST), amino acid reconstruction, water-plasma-enabled exfoliation and dry exfoliation methods can also be applied to prepare LDH nanosheets. [95][96][97][98][99] For instance, Wang et al reported the scale-up synthesis of Zn 2 Al-borate LDH nanosheets using the AMOST method. 96 Bulk Zn 2 Al-borate LDHs were first synthesized by co-precipitation.…”