One-step solvothermal synthesis of interlaced nanoflake-assembled flower-like hierarchical Ag/Cu₂O composite microspheres with enhanced visible light photocatalytic properties

Abstract

The interlaced nanoflake-assembled flower-like hierarchical Ag/Cu2O composite microspheres with enhanced visible light photocatalytic properties have been prepared via a one-step, environmentally friendly solvothermal method.

Importance of Ag–Cu Biphasic Boundaries for Selective Electrochemical Reduction of CO2to Ethanol

“…Therefore, we selected the Ag-Cu 2 O at 0.39 V where the peak at 36.7° matches pure Cu 2 O­(111) and the other peak at 38.2° corresponds to pure Ag(111), which indicates that the Ag-Cu 2 O is formed in the bimetallic catalyst maintaining their own crystalline phases of Cu 2 O and Ag, respectively. On the other hand, the prepared sample in KCN (Figure b) shows a specific peak between the 2θ positions (36.7 and 38.2°) together with the disappearance of pure Cu 2 O­(111) and peak broadening of Ag(111) at an applied potential of 0.24 V. Theoretically, introducing other atoms into a structure of the host material can lead to peak shifts because of the difference in size of the atoms and subsequent changes in lattice parameters depending on whether the introduced atom is larger or smaller than the size of the host atom. − Given in this context the peak of Ag-Cu 2 O (37.6°) prepared in KCN, it is rational to assume that the peak originates from the shift of the Cu 2 O­(111) peak due to partial substitution of Ag for host Cu 2 O and/or formation of a solid Ag-Cu 2 O solution at the grain boundary. − In any case, it is clear that Ag and Cu 2 O can be structured in a phase-blended form in KCN, in contrast to the phase-separated composition in NH 3 solution . As shown in Figure b, at 0.34 V, Ag was electrochemically deposited earlier in KCN and from 0.29 V the Ag-Cu 2 O related peak (37.6°) started to increase.…”

Preparation and application of (Cu2O‐Ag)@TA composite nanomaterials with enhanced stability and photocatalytic antibacterial activity

“…By contrast, the same Cu (I) 2p 3/2 (931.71 eV) and Cu (I) 2p 1/2 (951.52 eV) characteristic peaks can be observed in the Cu 2p region, and their binding energy is slightly lower than that of Cu 2 O, which is the result of charge transfer between Cu 2 O and silver nanoparticles. [ 23,35 ] The peaks at 368.58 and 374.59 eV (Figure 2F) should correspond to Ag 3d 5/2 and Ag 3d 3/2 , and the split peaks have a binding energy difference of 5.99 eV, indicating that the silver is in the metallic state. [ 36 ] The signals of Cu (I) 2p 3/2 , Cu (I) 2p 1/2 , Ag 3d 5/2 , and Ag 3d 3/2 were weakened, and the C 1 s signal was enhanced after the modification of Cu 2 O‐Ag with tannic acid, indicating that the tannic acid was successfully encapsulated on the Cu 2 O‐Ag surface.…”

“…This is mainly due to the existence of Schottky barriers at the interface between noble metals and semiconductors, in which noble metals can act as electron traps and photogenerated holes can be retained on the semiconductor surface, which can effectively prevent the compounding of electrons and holes, improving the photocatalytic efficiency of semiconductor. [ 23 ] In addition, silver is more attractive than other precious metals because of its high electrical conductivity, low toxicity, and excellent antibacterial properties. [ 24–26 ] Therefore, it is an excellent choice to improve the dispersion and stability of Cu 2 O by constructing a Cu 2 O‐Ag metal–semiconductor heterostructure.…”

Supramolecular Ensemble of Perylene Bisimide Derivative and Cu2O-Ag Nanoparticles: Nano/“Dip Strip” Catalytic System for One-Pot, Three-Component Click Reaction at Room Temperature

“…Next, we prepared bare Cu 2 O-Ag NPs 34 and utilized them as a catalytic system in the model reaction, and the desired product was furnished only in 45% yield (Entry 11, Table 1). We also used bare Cu 2 O NPs 35 for this study, and the target compound was obtained in 30% yield (Entry 12, Table 1).…”