如图5a,在O2饱和水溶液中,Ni k边XANES光谱的强度增强,表明Ni氧化态的增加,促进了·O2-的形成。FT-EXAFS光谱(图5b)显示,主峰位移0.03 Å,表明在反应过程中Ni-N键的扩展。如图5c所示,O2吸附活化后,Ni-N3位点转化为O1-Ni-N2,进一步促进*OOH中间体(HOO-Ni-N2)的形成,从而加速H2O2的生成。Bader电荷分析(图5d...
对应的能谱(EDS)元素分布分析映射图像显示Ni-N4和Ni-N4-CF2中C、N、O和Ni以及Ni-N4-CF2中F在碳骨架上均匀分布(图2e和2i)。 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XAN...
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)...
通过对样品进行同步辐射测试,Ni3N@2M-MoS2和Ni3N的吸附边缘与Ni foil相比可以发现其向高能量方向轻微移动,这表明Ni3N@2M-MoS2和Ni3N中的Ni与其金属态相似,但带部分正电荷。而Mo的XANES光谱中Ni3N@2M-MoS2和2M-MoS2基本相同, Mo的价态为+4。Ni的R空间中,与Ni foil相比,Ni3N@2M-MoS2和Ni3N的主峰明显地向右...
通过对样品进行同步辐射测试,Ni3N@2M-MoS2和Ni3N的吸附边缘与Ni foil相比可以发现其向高能量方向轻微移动,这表明Ni3N@2M-MoS2和Ni3N中的Ni与其金属态相似,但带部分正电荷。而Mo的XANES光谱中Ni3N@2M-MoS2和2M-MoS2基本相同,Mo的价态为+4。Ni的R空间中,与Ni foil相比,Ni3N@2M-MoS2和Ni3N的主峰明显地向右...
▲Figure 2(a) Ru K-edge XANES spectra, (b) First derivatives from the Ru K-edge XANES spectra, and (c) FT k3-weighted EXAFS spectra of 2.20 wt% Ru SAs–Ni2P, RuO2, and reference Ru foil. WT of the Ru K-edge of the EXAFS spectra of (d) Ru foil, (e) RuO2(red line), ...
(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...
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 electron-enriched Niδ− species over various TiO2−x/Ni catalysts, in ...
(c) XANES spectra at the 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 ...
图4.Fe1-Ni1-N-C和Fe1-N-C的(a) Fe K边 XANES和 (b)傅里叶变换扩展x射线吸收精细结构 (FT-EXAFS) 谱。(c)Fe1-Ni1-N-C和Fe foil中Fe的小波变换图。(d)Fe1-Ni1-N-C的K边 EXAFS谱拟合和。(e)Fe1-Ni1-N-C和Ni1-N-C的Ni K边FT-EXAFS谱。(f)Fe1-Ni1-N-C的Ni K边EXAFS谱拟合。