Treating Copper(II) Oxide Nanoflowers with Hydrogen Peroxide: A Novel and Facile Strategy To Prepare High‐Performance Copper(II) Oxide Nanosheets with Exposed (1 1 0) Facets

Abstract

CuO nanosheets with exposed active (1 1 0) facets were facilely prepared through surface structure engineering by reassembling CuO nanoflowers in H2O2 aqueous solution. The CO oxidation activity on these CuO nanosheets was markedly higher than that on the pristine nanoflowers, for which the 100 % CO conversion temperature on the former was 40 °C lower than that on the latter and equal to that on a commercial catalyst (1 %Pd/γ‐Al2O3). This work provides a new strategy to design and prepare high‐performance nanostructured CuO catalysts.

Mn-Modified CuO, CuFe2O4, and γ-Fe2O3 Three-Phase Strong Synergistic Coexistence Catalyst System for NO Reduction by CO with a Wider Active Window

“…It was also reported that the molecule NO preferentially binds to the oxygen atom pointing upward to the (110) plane. 37,38 On the basis of the above XRD results, it can be concluded that three types of crystalline substances coexist in the present catalysts (which can be further proved by Figure 3c), and the existing states of their cations are also highly consistent with the XPS results discussed above. The 0.010 MnFeCu sample has relatively more CuO (110) crystal plane (as shown in Figure 3c), and these CuO species are closely related to the surrounding γ-Fe 2 O 3 and CuFe 2 O 4 , which may produce a number of defects accompanied by a large number of active oxygen species (O 1s XPS results of the 0.010 MnFeCu sample shown in Figure 2a, and these active oxygen species can be easily reduced to oxygen vacancies) at the two-phase contact surface, so it has higher activity.…”

“…Therefore, it can be seen that the strength of CuO (110) gradually weakens. As reported previously, 37 the catalytic activity of CuO nanoparticles with the exposed active (110) facet for CO oxidation was significantly higher than that of the original nanoflower. It was also reported that the molecule NO preferentially binds to the oxygen atom pointing upward to the (110) plane.…”

Tuning SnO2 surface with CuO for soot particulate combustion: The effect of monolayer dispersion capacity on reaction performance

“…9. Pure SnO2 shows a major reduction peak at 660 °C, which is assigned to the reduction of bulk SnO2 to metallic tin [24,40]; this is also verified by the quantification results shown in Table 3. For all the CuO/SnO2 samples, besides the major reduction peak of SnO2, a group of low-temperature reduction peaks assigned to CuO reduction are observed [27], which is confirmed by the quantified O/Cu atomic ratios listed in Table 3.…”

Refining Metal–Support Interactions via Surface Modification of Irreducible Oxide Support for Enhanced Complete Propane Oxidation

“…24 Besides, the weak acidity of H 2 O 2 was reported as the reason for reconstructing the pristine CuO nanoflower into nanosheet with preferentially exposed (110) surface. 25 Moreover, the surfaces of catalysts such as Mn 2 O 3 , CeO 2 −MnO 2 , MoS 2 , among others have also been effectively modified through H 2 O 2 etching. 26−29 To investigate the influence of surface modification of the MAO support using H 2 O 2 in this work, NH 3 -TPD and CO 2 -TPD experiments were first conducted to analyze the acid and base properties of the supports.…”

“…For example, previous studies have demonstrated that NiMoO 4 nanorods can be subjected to H 2 O 2 etching, resulting in the induction of abundant cation deficiencies and lattice distortion originated Ni 2+ turning into Ni 3+ on their surface . Besides, the weak acidity of H 2 O 2 was reported as the reason for reconstructing the pristine CuO nanoflower into nanosheet with preferentially exposed (110) surface . Moreover, the surfaces of catalysts such as Mn 2 O 3 , CeO 2 –MnO 2 , MoS 2 , among others have also been effectively modified through H 2 O 2 etching. − …”