通过Zn K-edge XAS谱可以进一步证实Zn是以原子的形式存在,随着热解温度的升高,Zn2+的位置更接近于ZnN4的平面几何形状。 根据以往的报道,当Fe阳离子接近N4平面时,Fe-N4催化中心的理论Fe K-edge XAS研究也得到了类似的结果。 因此,作者...
为了评估这种以 Cl 为主的 Zn2+配位环境在本体溶液中的持久性是否可行, 比较了低浓度 Zn2+-卤化物混合物与过量 TFSI - (5 mM ZnX2+ 0.2 M LiTFSI) 的 XAS 测量值与浓缩 (0.2 M Zn2+) 混合 TFSI-卤化物电解液。这些低浓度 Zn2+电解液直接与电化学...
为了评估这种以 Cl 为主的 Zn2+配位环境在本体溶液中的持久性是否可行, 比较了低浓度 Zn2+-卤化物混合物与过量 TFSI – (5 mM ZnX2+ 0.2 M LiTFSI) 的 XAS 测量值与浓缩 (0.2 M Zn2+) 混合 TFSI-卤化物电解液。这些低浓度 Zn2+电解液直接与电化学研究的浓度方案进行比较。低浓度 Zn2+电解液的 EX...
通过拉曼光谱、DFT计算和Zn K-edge EXAFS的建模,作者发现当电解液中也存在卤素阴离子(X)时,有大量的Zn–TFSI接触离子对,其中Zn(TFSI)(X)物种被认为是主要的CIP溶剂化结构。这与纯ZnTFSI2电解液形成对比,后者在本体中更喜欢第一壳层二甘醇配位,表明卤化物的存在诱导TFSI−直接配位Zn2+。使用静态和旋转圆盘电...
Zn K-edge XAS of Zn-C-MBD in the presence of one equivalent of Zn2+ shows that the average zinc complex formed is composed of three His and one Cys residues. Upon the addition of two extra Zn2+ ions per C-MBD, these appear coordinated primarily by His residues thus, suggesting that...
Arsenic Incorporation in Synthetic Struvite (NH4MgPO4·6H2O): A Synchrotron XAS and Single-Crystal EPR Study Modeling of As K-edge EXAFS data suggest that local structural distortion associated with the substitution of As5+ for P5+ in struvite reaches up to 3.75 Å. Single-crystal electron pa...
(crystal) wide band gap semiconductors XANES X-ray diffraction zinc compounds/ lattice defects ferromagnetic film nitrogen pressures X-ray diffraction XRD X-ray absorption spectroscopy XAS EXAFS extended X-ray absorption fine structure X-ray absorption near-edge structure XANES X-ray polarization grain ...
We have performed X-ray absorption spectroscopy (XAS) measurements at Zn and Cu K-edge to better characterize the Zn-Cu alloy-based anode at different states of charge (SOC)42,43,44. The Zn K-edge X-ray absorption near edge structure (XANES) in Supplementary Fig.14areveals the slight oxi...
The monochromator energy of each spectrum was calibrated using Zn foil between the second and third ionization chambers; its absorption edge was calibrated to an edge of 9659 eV. Zn Kα fluorescence was recorded using a 30-element germanium detector (Canberra Industries, Meriden, CT, USA) ...
本文研究了轮胎半焦在生物质及其模型化合物热解过程中的催化性能。通过采用XPS,TEM-SAED,XAS,Pyridine-FTIR和NH3-TPD等分析测试手段对新鲜和使用过的催化剂进行了详细的表征,从而阐明了轮胎半焦在生物质挥发分催化过程中的作用机理。主要结论为: 1)...