Takahashi Shigehiro, Abiko Naoyuki, Anzai Jun-Ichi
Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
Materials (Basel). 2013 May 7;6(5):1840-1850. doi: 10.3390/ma6051840.
The surface of a glassy carbon (GC) electrode was modified with reduced graphene oxide (rGO) to evaluate the electrochemical response of the modified GC electrodes to hydrogen peroxide (H₂O₂) and hydrazine. The electrode potential of the GC electrode was repeatedly scanned from -1.5 to 0.6 V in an aqueous dispersion of graphene oxide (GO) to deposit rGO on the surface of the GC electrode. The surface morphology of the modified GC electrode was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM and AFM observations revealed that aggregated rGO was deposited on the GC electrode, forming a rather rough surface. The rGO-modified electrodes exhibited significantly higher responses in redox reactions of H₂O₂ as compared with the response of an unmodified GC electrode. In addition, the electrocatalytic activity of the rGO-modified electrode to hydrazine oxidation was also higher than that of the unmodified GC electrode. The response of the rGO-modified electrode was rationalized based on the higher catalytic activity of rGO to the redox reactions of H₂O₂ and hydrazine. The results suggest that rGO-modified electrodes are useful for constructing electrochemical sensors.
用还原氧化石墨烯（rGO）修饰玻碳（GC）电极的表面，以评估修饰后的GC电极对过氧化氢（H₂O₂）和肼的电化学响应。在氧化石墨烯（GO）的水分散液中，将GC电极的电极电位从-1.5 V反复扫描至0.6 V，以便在GC电极表面沉积rGO。通过扫描电子显微镜（SEM）和原子力显微镜（AFM）对修饰后的GC电极的表面形态进行了表征。SEM和AFM观察结果表明，团聚的rGO沉积在GC电极上，形成了相当粗糙的表面。与未修饰的GC电极相比，rGO修饰的电极在H₂O₂的氧化还原反应中表现出明显更高的响应。此外，rGO修饰电极对肼氧化的电催化活性也高于未修饰的GC电极。基于rGO对H₂O₂和肼的氧化还原反应具有更高的催化活性，对rGO修饰电极的响应进行了合理的解释。结果表明，rGO修饰电极可用于构建电化学传感器。
