研究目的
Investigating the origin of the overpotential for the oxygen evolution reaction on a well-defined graphene electrode.
研究成果
The OER preferentially takes place at the interface between the Li2O2 and graphene, reducing the electric conductivity between them by decreasing their contact area before a large part of the deposited Li2O2 was oxidized. This elucidates the origin of the high overpotential for the OER on the carbon cathode of the Li-O2 battery.
研究不足
The study focuses on a well-defined graphene monolayer, which may not fully represent the behavior of porous carbon materials commonly used in Li-O2 batteries. The SFG signal detects only the amount of DMSO on the graphene surface, not directly the Li2O2 coverage.
1：Experimental Design and Method Selection:
The study combined electrochemistry and sum frequency generation (SFG) vibrational spectroscopy to investigate the ORR and OER on a well-defined graphene monolayer electrode in DMSO-based electrolyte solutions.
2：Sample Selection and Data Sources:
A graphene monolayer prepared by chemical vapor deposition was transferred onto a calcium fluoride prism. DMSO-based electrolyte solutions containing TBAClO4 or LiClO4 were used.
3：List of Experimental Equipment and Materials:
A broadband SFG system was used for in situ SFG measurements. The electrochemical cell was combined with the SFG measurement using the internal reflection geometry.
4：Experimental Procedures and Operational Workflow:
Cyclic voltammetry (CV) measurements were performed on the graphene electrode in O2-saturated DMSO solutions. SFG spectra were recorded simultaneously during the CV measurements.
5：Data Analysis Methods:
The SFG peak intensity was semi-quantitatively employed as an indicator for coverage of the DMSO adsorbed on the graphene surface.
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