A Large Quantity of ZnO Nanorods Grown at Room Temperature

“Two Ships in a Bottle” Design for Zn–Ag–O Catalyst Enabling Selective and Long-Lasting CO2 Electroreduction

“…In the corresponding Fourier-transform k 3 -weighted EXAFS spectra (Figure d), before the voltage was applied, ZnO–Ag@UC shows two prominent peaks corresponding to the first and second neighboring Zn atoms in the ZnO phase, where Zn is coordinated to 4 O atoms (Zn–O) with a bond length of 1.98 Å in the first shell while the second neighboring Zn is bounded by 12 Zn atoms (Zn–Zn) with a bond length of 3.21 Å. , Compared to ZnO@UC, ZnO–Ag@UC displays a lower coordination number for the Zn–O bond derived from the effective coordination regulation from Ag. Especially, on application of a potential, the second peak for 12 Zn atoms almost disappears, while the first peak for Zn–O coordination shows a significantly increased Debye–Waller factor along with reduced coordination number and bond length (Table S1), implying an intensified structural disorder in the Zn–O coordination with the possible formation of Zn–O–Ag coordination during CO 2 RR . The Ag near-edge position of ZnO–Ag@UC is between that of Ag foil and Ag 2 O (Figure e), indicating that the Ag valence state is intermediate to Ag 0 and Ag + , which probably arises from the electron donation from Ag to O.…”

“…42 Upon application of a potential from −0.6 to −1.2 V (versus reversible hydrogen electrode, RHE), the Zn absorption edge of ZnO−Ag@UC positively shifts to even higher oxidation states, confirming enhanced electron density depletion around Zn atoms during S1), implying an intensified structural disorder in the Zn−O coordination with the possible formation of Zn−O−Ag coordination during CO 2 RR. 45 The Ag near-edge position of ZnO−Ag@UC is between that of Ag foil and Ag 2 O (Figure 3e), indicating that the Ag valence state is intermediate to Ag 0 and Ag + , which probably arises from the electron donation from Ag to O. The electron transfer effects are more pronounced at the applied potentials where the Ag absorption-edge shifts toward higher energy.…”

Selective and Scalable CO2 Electrolysis Enabled by Conductive Zinc Ion-Implanted Zeolite-Supported Cadmium Oxide Nanoclusters

“…As compared to ZnY, CdO@ZnY possesses a shortened Zn–O bond length derived from the effective coordination regulation of CdO. According to the EXAFS fitting results (Figure S17 and Table S5), upon application of a potential from −0.7 to −1.1 V, the bond length of the Zn–O coordination is significantly reduced, while the Debye–Waller factor is prominently increased, implying an intensified structural disorder in the Zn–O coordination during the CO 2 RR. , These results unravel the varying coordination environment of CdO@ZnY as a result of the strong interplay between the CdO nanocluster and ZnY support along with electronic reconfiguration during the CO 2 RR, which could tune the binding strength with *COOH and HCOO* to selectively produce CO over HCOOH.…”

In Situ Observation of ZnO Nanoparticle Formation by a Combination of Time-Resolved X-ray Absorption Spectroscopy and X-ray Diffraction

“…In contrast, the growth of a third structural modification of ZnO, namely the cubic zincblende type ZnO, is still challenging [24,25]. Compared to the bulk oxide, Wurtzite ZnO nanorods prepared by oxidation of metallic Zn in NaCl solutions exhibited more disorder and slightly larger Zn-Zn interlayer distances as investigated by EXAFS measurements [26]. Wurtzite nanoparticles with a size of about 3-5 nm prepared by hydrolysis from Zn(acac) 2 under ultrasonic excitation with organic additives revealed a contraction of the Zn-O bond according to the strong interaction of Zn and oxygen [27].…”