Truncated concave octahedral Cu₂O nanocrystals with {hkk} high-index facets for enhanced activity and stability in heterogeneous catalytic azide–alkyne cycloaddition

Abstract

Truncated concave octahedral Cu2O nanocrystals with high-index {hkk} facets exhibited superior activity and stability toward azide–alkyne cycloaddition.

Well-defined Cu2O photocatalysts for solar fuels and chemicals

“…16 Therefore, it is useful to understand the synthetic recipes and the growth mechanism for the preparation of Cu 2 O nanocrystals with high-index facets. [56][57][58][59][60][61][62] Yang et al synthesised highly symmetric multi-facet polyhedral Cu 2 O microcrystals partially enclosed with high-index facets (i.e., including low-index {110}, {100}, {111} facets and high-index {544}, {522}, and {211} facets) in the system of Cu 2+ / NaOH/glucose or ascorbic acid solution at high temperature ( Fig. 9a1-c2).…”

Synthesis, Structure and Catalytic Properties of Faceted Oxide Crystals

“…Morphological control has also been achieved in the absence of capping agents; for example, temperature, [48,66,80] pH, [49,64,97] Cu(II) source, reductant, ions, and complexant concentrations have been used as variables to tune Cu 2 O habit [49,80,103] . Siegfried and Choi have studied the effect of inorganic ions on the electrodeposition of Cu 2 O on pre‐grown crystals [84] .…”

“…Changes in particle morphology were observed subsequent to some of these liquid phase reactions, suggesting possible leaching of particles, and preventing an understanding of coordination environment under reaction conditions [80,124] . Zeta potential measurements have commonly been used to rationalize trends in catalytic activity [46,125–127] . Rational design in such cases remains challenging due to the fact that the relationships of these experimental zeta potential measurements and surface structures have so far not been elucidated.…”

“…Cu 2 O (nano)crystal synthesis protocols have been reported for a wide variety of shapes/structures such as polyhedra, [43,44,49,[62][63][64][65][66][67] spheres, [68] hollow spheres, [69] hollow polyhedra, [34] nanowires, [40] and nanoparticles (NPs) with a hierarchical architecture. [70] Cu 2 O cubes, octahedra, and rhombic dodecahedra exclusively exposing (100), (111), and (110) surfaces, respectively, have been the focus of most catalytic studies.…”

“…[80,124] Zeta potential measurements have commonly been used to rationalize trends in catalytic activity. [46,[125][126][127] Rational design in such cases remains challenging due to the fact that the relationships of these experimental zeta potential measurements and surface structures have so far not been elucidated. It is also important to note that the zeta potential, although useful in determining the charge on a surface and electrostatic interactions resulting from the same, provides only indirect information about surface coordination environment.…”