Effect of the electrochemical oxidation/reduction cycle on the electrochemical capacitance of graphite oxide
Effect of the electrochemical oxidation/reduction cycle on the electrochemical capacitance of graphite oxide
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DOI：
10.1016/j.carbon.2014.04.034
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发表时间：
2014-09
期刊：
影响因子：
10.9
通讯作者：
Hikaru Tateishi;M. Koinuma;S. Miyamoto;Y. Kamei;Kazuto Hatakeyama;C. Ogata;T. Taniguchi;Asami Funatsu;Y. Matsumoto
中科院分区：
文献类型：
--
作者：
Hikaru Tateishi;M. Koinuma;S. Miyamoto;Y. Kamei;Kazuto Hatakeyama;C. Ogata;T. Taniguchi;Asami Funatsu;Y. Matsumoto
氧化程度不同，各官能团的含量也会发生变化，因此氧化程度对氧化石墨烯（GO）的性能影响很大。目前还没有关于氧化石墨烯再氧化再还原的研究。本文报道了氧化/还原循环对氧化石墨（GtO，多层氧化石墨）组成和电化学电容性能的影响。分别在+2.0 V和- 1.1 V （vs. Ag/AgCl）电位下对玻璃碳（GC）进行电化学氧化和还原，并测定其电化学电容。根据x射线光电子能谱（XPS）分析，还原氧化石墨（rGtO）的CH缺陷通过电化学再氧化产生了c双键和dc键。还原样品中含有CH缺陷，再氧化样品中含有新生成的c双键和dc键，其电导率分别较高和较低。rGtO电极的高电化学电容是由CH缺陷的活性和良好的导电性引起的。
Reduction largely affects the properties of graphene oxide (GO), because the content of each functional group changes by the oxidation degree. So far no study about re-oxidation and re-reduction of GO has been carried out. Herein, we report the effects of oxidation/reduction cycle of graphite oxide (GtO, multilayered GO) on its composition and electrochemical capacitance property. Electrochemical oxidation and reduction of glassy carbon (GC) were conducted at potentials of +2.0 and −1.1 V (vs. Ag/AgCl), respectively, and then the electrochemical capacitances were measured. According to X-ray photoelectron spectroscopy (XPS) analysis, Cdouble bondC bonds were produced from CH defects of the reduced graphite oxide (rGtO) by the electrochemical re-oxidation. The conductivities of the reduced samples, with CH defects, and re-oxidized samples, with newly produced Cdouble bondC bonds, were high and low, respectively. The high electrochemical capacitance observed for the rGtO electrodes is caused by the activity of the CH defects and good conduction.