原位拉曼光谱法阐明吸附对石墨烯电化学的影响。
In-situ Raman spectroscopy to elucidate the influence of adsorption in graphene electrochemistry.
机构信息
BIOS - Lab on a Chip group, MESA+ Institute for Nanotechnology and MIRA Institute for Biomedical Engineering and Technical Medicine, University of Twente, Enschede, P.O. box 217 7500AE, The Netherlands.
Plasma and Materials Processing Group, Department of Applied Physics, Eindhoven University of Technology, Eindhoven, PO Box 513, 5600MB, The Netherlands.
出版信息
Sci Rep. 2017 Mar 24;7:45080. doi: 10.1038/srep45080.
Electrochemistry on graphene is of particular interest due to graphene's high surface area, high electrical conductivity and low interfacial capacitance. Because the graphene Fermi level can be probed by its strong Raman signal, information on the graphene doping can be obtained which in turn can provide information on adsorbed atoms or molecules. For this paper, the adsorption analysis was successfully performed using three electroactive substances with different electrode interaction mechanisms: hexaammineruthenium(III) chloride (RuHex), ferrocenemethanol (FcMeOH) and potassium ferricyanide/potassium ferrocyanide (Fe(CN)). The adsorption state was probed by analysing the G-peak position in the measured in-situ Raman spectrum during electrochemical experiments. We conclude that electrochemical Raman spectroscopy on graphene is a valuable tool to obtain in-situ information on adsorbed species on graphene, isolated from the rest of the electrochemical behaviour.
由于石墨烯具有高比表面积、高导电性和低界面电容，因此其电化学性质备受关注。由于石墨烯的费米能级可以通过其强拉曼信号来探测，因此可以获得有关石墨烯掺杂的信息，进而可以提供有关吸附原子或分子的信息。在本文中，成功地使用三种具有不同电极相互作用机制的电活性物质进行了吸附分析：六氨合钌(III)氯化物（RuHex）、二茂铁甲醇（FcMeOH）和铁氰化钾/亚铁氰化钾（Fe（CN））。通过分析电化学实验过程中原位拉曼光谱中 G 峰的位置来探测吸附状态。我们得出结论，石墨烯的电化学拉曼光谱是一种很有价值的工具，可以在不影响电化学行为的情况下，原位获取石墨烯上吸附物种的信息。
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