Electrochemical characterization of electrochemically reduced graphene coatings on platinum. Electrochemical study of dye adsorption
Electrochemical characterization of electrochemically reduced graphene coatings on platinum. Electrochemical study of dye adsorption
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DOI：
10.1016/j.electacta.2015.03.054
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发表时间：
2015-06
影响因子：
6.6
通讯作者：
J. Molina;J. Fernández;C. García;A. D. Río;J. Bonastre;F. Cases
中科院分区：
文献类型：
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作者：
J. Molina;J. Fernández;C. García;A. D. Río;J. Bonastre;F. Cases
用循环伏安法在铂电极上合成了还原的石墨烯氧化物涂层。首次利用扫描电化学显微镜对电化学还原氧化石墨烯进行了分析。氧化还原介质影响电化学响应，因此Ru(NH_3)_(63+)和Fe(CN)_(63)−的响应相似，而Fe~(3+)的响应最差。用循环伏安法研究了氧化石墨烯修饰的铂电极对亚甲蓝、Procion MX-2R和Amaranth等不同染料的电化学吸附。电化学方法被证明是监测染料在石墨烯材料表面吸附的有效方法。经亚甲基蓝和Procion MX-2R吸附后，观察到稳定的氧化还原对(有1个电子转移)。由于氧化还原对的强度与所使用的扫描速率成正比，因此该氧化还原对被吸附控制。与在开路电位下的简单吸附相比，电化学吸附使亚甲基蓝在还原氧化石墨烯表面的电荷增加了3倍。在Procion MX-2R的情况下，获得的增长甚至更高，增长了6倍。
Reduced graphene oxide coatings were synthesized by cyclic voltammetry on Pt electrodes. Electrochemically reduced graphene oxide was analyzed by scanning electrochemical microscopy for the first time. The redox mediator influences the electrochemical response; thus Ru(NH3)63+and Fe(CN)63−gave a similar response and Fe3+gave the poorest response. Pt electrodes coated with reduced graphene oxide were also used in the electrochemical adsorption (performed by cyclic voltammetry) of different dyes (Methylene Blue, Procion MX-2R and Amaranth). Electrochemical methods proved to be useful to monitor the adsorption of dyes on the surface of graphene materials. After adsorption, with Methylene Blue and Procion MX-2R, the appearance of a stable redox pair (with 1 electron transfer) was observed. This redox pair was adsorption controlled since the intensity of the redox pair was proportional to the scan rate used. Electrochemical adsorption multiplied by 3 the electrical charge of the Methylene Blue adsorbed on the surface of reduced graphene oxide when compared with simple adsorption at open circuit potential. In the case of Procion MX-2R, the increase obtained was even higher, with a 6-fold increase.