与纳米颗粒相比，单原子催化剂（SACs）具有显著的优势，包括原子利用率的最大化、均一的反应活性位点，以及降低氢解离活性和增强反应物与催化剂间相互作用的能力。本研究中，我们利用氧空位的吸附及还原特性，通过水热法成功制备出富含氧空位的TiO2-x。随后，采用原位氧化还原法将Pt原子锚定在TiO2-x上。借助XRD、Ra...
在H218O的电解液中,如果双氧水的生成是水中的OH*偶联机制的话,O-O键中的O将来自H218O,即我们应该看到大量的18O-18O产物,对应的Raman峰也会向左偏移。如果反应是经历OH*和CO3耦合机制,会形成18O-16O产物,也会看到Raman峰的偏移,...
上述理论结果与我们的实验结果吻合较好,证明了Pt-NiCo LDO在LDO层中插入Pt SAs有利于H2O解离,从而实现了具有高催化活性的电催化剂。 图4.DFT理论计算结果:(a) Pt-NiCo LDO和(b) Pt/NiCo LDO的HER催化过程示意图; (c) *OH-H和H...
总之,作者利用原位ATR-SEIRAS表征手段,深入理解催化剂表面结构和催化性能的内在联系。证实Ru覆盖层与Pt基底存在着电子和应变效应,从而增强中间体*H和*OH的结合强度。结合理论计算发现在HER过程中,增强的*H和*OH吸附强度可降低H2O解离步骤的能垒;在HOR过程中,*OH吸附强度的增强可以降低*H氧化的能垒,同时较强的*H结...
So far, it is frequently assumed that the OH adsorption on Pt only takes place at potentials higher than 0.55 V (versus the reversible hydrogen electrode), regardless of the Pt surface structure. However, by CO displacement experiments, alternating current voltammetry, and Raman spectroscopy, ...
(101) planes of the graphitic carbon. No metal-related peaks are observed in the XRD patterns, including the Pt-NPs/CoNC composite, indicating the ultra-small sizes of the metal species in these samples render them undetectable by XRD30. Supplementary Fig.9brepresents the Raman spectra of CoNC...
CO electrooxidation on Pt(hkl) surfaces in acidic solution has been investigated using in situ shell﹊solated nanoparticle〆nhanced Raman spectroscopy (SHINERS). Direct spectroscopic evidence for OH* and COOH* species was observed and further confirmed by deuterated isotopic experiments and DFT ...
The Raman characterization in Fig. S12 show that no peak in region of 1000 cm−1–1800 cm−1 was observed in Pt3.0/K3.0-Al2O3-m, indicating that no evident coke relevant to ideal and disordered graphite was generated (Zhu et al., 2022). However, a broad peak in range of 2000 ...
A new experimental method is described that uses Raman spectroscopy to measure the conce... JD Taylor,MD Allendorf,AH Mcdaniel,... - 《Industrial & Engineering Chemistry Research》 被引量: 37发表: 2003年 Tailored Noble Metal Nanoparticles on γ-Al2O3 for High Temperature CH4 Conversion to ...
We successfully obtained the Raman signal of top and bridge site adsorbed CO* molecules on Pt(111) and Pt(100). In contrast, on Pt(110) surfaces only top site adsorbed CO* was observed during the entire electrooxidation process. Direct spectroscopic evidence for OH* and COOH* species forming...