研究目的
Investigating the incipient anion intercalation of HOPG close to the oxygen evolution potential using combined X-ray photoemission and Raman spectroscopy study.
研究成果
The study reveals that HOPG intercalation begins at potentials close to oxygen evolution, before reaching higher potentials associated with massive intercalation. This finding is supported by both XPS and Raman spectroscopy, indicating the formation of an incipient intercalation phase.
研究不足
The study focuses on HOPG as a model system, which may not fully represent all graphite materials. The small intensity of XPS features in sulphuric acid electrolyte complicates analysis.
1：Experimental Design and Method Selection:
The study used cyclic voltammetry (CV) and normal pulsed voltammetry (NPV) for anion intercalation in HOPG in perchloric and sulphuric acid electrolytes. XPS and Raman spectroscopy were used for chemical analysis.
2：Sample Selection and Data Sources:
Z-grade HOPG samples were used as working electrodes in a three-electrode EC cell with Pt as counter and quasi-reference electrodes.
3：List of Experimental Equipment and Materials:
AMEL 2553 potentiostat/galvanostat, Horiba Jobin Yvon LabramHR800 Raman spectrometer, Olympus BX41 microscope, Al Kα XPS source.
4：Experimental Procedures and Operational Workflow:
EC treatments were applied at various potentials, followed by XPS and Raman analysis. Raman spectra were recorded in-situ during CV.
5：Data Analysis Methods:
XPS data were fitted with Gaussian-Lorentzian curves; Raman spectra were analyzed for G, Gi, and D band intensities.
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