One-pot electrochemical synthesis of graphene by the exfoliation of graphite powder in sodium dodecyl sulfate and its decoration with platinum nanoparticles for methanol oxidation
One-pot electrochemical synthesis of graphene by the exfoliation of graphite powder in sodium dodecyl sulfate and its decoration with platinum nanoparticles for methanol oxidation
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DOI：
10.1016/j.carbon.2012.08.028
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发表时间：
2013
期刊：
影响因子：
10.9
通讯作者：
K. Kakaei
中科院分区：
文献类型：
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作者：
K. Kakaei
我们展示了一种从石墨粉和阴离子表面活性剂十二烷基硫酸钠辅助电化学剥离中直接在碳纸和玻碳(GC)衬底上大面积生长石墨烯的方法。用扫描电子显微镜(SEM)和电化学技术对电化学还原的石墨烯进行了表征。特别是，扫描电子显微镜图像显示，由“海胆”物体形成的石墨烯结构的生长增强。循环伏安光谱表明，通过电化学还原，各种含氧官能团已从石墨平面上完全去除。石墨烯电极在[Fe(CN)6]3−/4−溶液中的电位峰最小为212 mV，比石墨电极小168 mV。这可能是由于高质量的石墨烯加快了[Fe(CN)6]3−/4−电化学中的电子转移速度。最后，铂被电还原到GC和石墨烯修饰的GC基电极上，用于甲醇的氧化。石墨烯负载铂纳米粒子和铂-GC电催化剂对甲醇氧化的催化活性分别为1900和915.5Ag−1pt，揭示了剥离型石墨烯载体的特殊性质。
We demonstrate a method which directly grows large areas of graphene on carbon paper and glassy carbon (GC) substrates from graphite powder and anionic surfactant, sodium dodecyl sulfate, assisted electrochemical exfoliation. The electrochemically reduced graphene has been carefully characterized by scanning electron microscopy (SEM) and electrochemical techniques. Particularly, SEM images show enhanced growth of graphene structures formed of ‘urchin’ objects. The CV spectra illustrate that a variety of the oxygen-containing functional groups has been thoroughly removed from the graphite plane via electrochemical reduction. Potential peak (Ep) of graphene electrode in [Fe(CN)6]3−/4−solution is as small as 212mV which is 168mV smaller than that of graphite electrode. This could be attributed to the high quality graphene accelerating the electron transfer rate in [Fe(CN)6]3−/4−electrochemistry. Finally, platinum was electro reduced onto the GC and graphene modified GC based electrodes for use in methanol oxidation. The catalytic activities of graphene-supported Pt nanoparticles and Pt-GC electrocatalysts for methanol oxidation were 1900 and 915.5Ag−1Pt, which can reveal the particular properties of the exfoliated graphene supports.