期刊
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
卷 182, 期 1-2, 页码 57-62出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elspec.2010.07.001
关键词
X ray photoelectron spectroscopy; Electrochemical intercalation; Electrochemical double layer capacitor; Highly oriented pyrolytic graphite; Fermi level shift
类别
Highly oriented pyrolytic graphite electrodes were electrochemically treated in electrochemical double layer capacitor electrolyte and studied by X-ray photoelectron spectroscopy (XPS) The used electrolyte was 1 M tetra-ethyl-ammonium tetra-fluoroborate (Et(4)NBF(4)) dissolved in propylene carbonate Intercalation of the ions into the graphitic host structure results in core level shifts of the XP-spectra The spectra of the host and the intercalating species shift towards higher values of binding energy for the negatively and towards lower values for the positively polarized electrodes which is ascribed to the Fermi level shifts of the intercalation compound The reversibility of ion insertion is quantified by deconvolution of the XP signals and is shown to be less for the Et(4)N(+) canon than for the BF(4)(-) anion (C) 2010 Elsevier B V All rights reserved
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