2016年3月11日 · Scanning electron microscopy, X-ray diffraction, cyclic voltammetry, chronoamperometry, in situ Raman spectroscopy, and X-ray absorption near-edge structure spectroscopy (XANES) were used to investigate the electrochemical oxygen evolution reaction (OER) on Cu, Cu 2 O, Cu (OH) 2, and CuO catalysts. …

2015年2月16日 · CuO nanoparticles (NPs) and Cu 2 O/CuO and CuO/TiO 2 nanocomposites (NCs) have been synthesized by using a modified co-precipitation method with three different schemes of synthesis. The crystal structures and morphologies of the samples have been investigated using synchrotron X-ray diffraction and …

This work investigated the Cu K-edged XANES spectra of copper(II) chloride aqueous solution mixed with glycine aqueous solution by varying Cu(II):Glycine molar ratio with the XANES spectra of...

For Hex-2Cu-O, the serial XANES spectra recorded by ramping down the applied potential from −0.6 to −1.5 V unveil the decay of Cu 2+ at 8984 eV but emergence of Cu 0 at 8980 eV even at low ...

2023年1月1日 · In this work, we investigate the use of linear combination fitting (LCF) of XANES spectra for the particular case of Cu doping in CdTe. We show that the experimental data seem to be accurately represented by standards of Cu 2 Te …

1993年1月1日 · 通过基于簇-CI 理论进行从头算量子化学计算来研究这些 XANES 光谱。 NaCuO2 的基态表现出 Cu 3d 和 O 2p 轨道之间的强共价键，导致 Cu (d8) 构型的贡献很小，而 Cu (d9) 构型的贡献很大。 NaCuO2 的 Cu K 壳激发态的终态效应与 CuO 相似，这解释了 NaCuO2 光谱中的整体结构与 CuO 相似。 另一方面，Cu2O 的基态证明了 Cu 3d、Cu 4s 和 O 2p 轨道之间的共价键，导致 Cu d94s 配置的贡献。 这种配置在 Cu2O 的 Cu K 壳激发态中引起另一种类型的终态 …

2009年11月5日 · We find that hexadentate donor sites in ethylenediaminetetraacetic acid enable the chelation of Cu ions, regulating Cu cluster size and forming Cu-N/O single sites that achieve high CH4 selectivity...

2008年9月1日 · X-ray absorption near-edge structure (XANES) spectroscopy at O K and Cu L 2, 3 absorption edges has provided us with a “magical” tool to probe the local densities of unoccupied O 2 p and Cu 3 d states near the Fermi level in a site-selective manner.

Cu 2 O nanocubes showed a remarkable increase (30 %) in the Faradaic efficiency for C 2+ liquid products after the decoration with Ag nanoparticles. Operando spectroscopy revealed a reaction-driven redispersion of Ag on CuO x as well as a certain Cu–Ag miscibility.

2020年8月11日 · The XANES study proves the assumption that Ce 4+ reduces the HOMO of atomic Cu(II) site and increases the energy of its 4p orbitals (Fig. 1).