图3e-f分析了Ni在NiSAPs-PuCN中的配位环境,与Ni-foil和NiO不同,NiSAPs-PuCN的WT等高线图在5.23 Å−1附近只有一个强度最大值(归因于Ni- N配位),表明Ni位点原子分散在NiSAPs-PuCN上。EXAFS的最佳拟合分析结果(图3d)表明,NiSAPs-PuCN中的每个Ni原子与3个N原子以Ni- N3配位成键。图3c所示为NiSAPs-...
Fig.2. (a) Ni K-edge EXAFS spectra of NiO, Ni-foil and In2O3@Ni. (b) Experimental and best-fitted EXAFS spectra in R space for In2O3@Ni. (c) Experimental and best-fitted EXAFS spectra in K space for In2O3@Ni. (d)...
图3. (a) Ni-N4-CF2、Ni-N4和Nipc的高分辨率XPS Ni2p光谱;(b) Ni-N4-CF2和Ni-N4的Ni-K边XANES光谱(Ni foil和NiO作对比);(c) Ni-N4-CF2和Ni-N4-CF2以及对比样品在Ni-K边的FT-EXAFS拟合图;(d) Ni-N4-CF2的FT-EXAFS拟...
e) Ni-N-C 850和Ni-N-C 1000的高分辨率XPS Ni 2p谱。f) Ni-N-C 850, Ni-N-C 1000和Ni foil的Ni k边EXAFS图像。g) Ni-N-C 850和h) Ni-N-C 1000的小波变换k3加权EXAFS谱。i) Ni-N-C 850样品的元素图。j)根据拉曼光谱和XPS光谱分别计算了不同Ni-N-C样品的ID/IG和sp2/sp3值。k)各种Ni...
(b) Operando XANES spectra for Ru K-edge XANES spectra of 2.20wt% Ru SAs–Ni2P under different overpotentials (vs RHE) during the HER, and reference standards of Ru foil and RuO2; (c) Correspondingk3-weighted FT spectra; WT of the Ru K-edge of the EXAFS spectra of (d) Ex situ ...
▲Figure 3. The profiles of Ni 2p XPS spectra: (a) fresh catalysts and (b) spentcatalysts. (c) Comparison of Ni K-edge k3-weighted EXAFS data for reduced catalysts, Ni foil, NiO and α-Ni(OH)2. (d) H2-TPR profiles of fresh catalysts. ...
e The corresponding normalized Ni K-edge Fourier-transform EXAFS spectra. f The Normalized Ti K-edge XANES spectra of various TiO2−x/Ni catalysts. WT analysis of (g) Ni foil, (h) NiTi-MMO, and (i) TiO2−x/Ni-450 catalyst. Full size image To further confirm the presence of ...
PtL3edge, along with reference spectra of Pt foil and PtO2standards. (d) Fourier transformation of EXAFS spectra at the PtL3edge. (e) XANES spectra at the NiKedge, along with reference spectra of Ni foil, NiO and Ni(OH)2standards. (f) Fourier transformation of EXAFS spectra at the ...
(c) Ni K-edge FT-EXAFS spectra in the R-space of NC@Ni/C-60, Ni foil and NiO. (d) WT-EXAFS of the Ni K-edge signal of NC@Ni/C-60.XANES 和 EXAFS证明制备的NC@Ni/C催化剂中Ni是以还原态的形式存在,并未形成Ni单原子活性位点,这证明优异的催化活性可能来源于掺杂于碳层中的杂原子N...
(h) NiSA/NP、NiSA、Ni-foil和NiPc的扩展X射线吸收精细结构(FT-EXAFS)谱图的傅里叶变换。(i) NiSA的EXAFS拟合。相关工作以“Electronic Regulation of Ni Single Atom by Confined Ni Nanoparticles for Energy-Efficient CO2 Electroreduction”为题发表在Angewandte Chemie International Edition上。图2. 在H型电解...