Fabrication of graphene/prussian blue composite nanosheets and their electrocatalytic reduction of H2O2

✍ Scribed by E. Jin; Xiaofeng Lu; Lili Cui; Danming Chao; Ce Wang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 373 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.07.029

✦ Synopsis

In this work, graphene/prussian blue (PB) composite nanosheets with good dispersibility in aqueous solutions have been synthesized by mixing ferric-(III) chloride and potassium ferricyanide in the presence of graphene under ambient conditions. Transmission electron microscopy (TEM) shows that the average size of the as-synthesized PB nanoparticles on the surface of graphene nanosheets is about 20 nm. Fourier-transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) patterns have been used to characterize the chemical composition of the obtained graphene/PB composite nanosheets. The graphene/PB composite nanosheets exhibit good electrocatalytic behavior to detection of H 2 O 2 at an applied potential of -0.05 V. The sensor shows a good linear dependence on H 2 O 2 concentration in the range of 0.02-0.2 mM with a sensitivity of 196.6 A mM -1 cm -2 . The detection limit is 1.9 M at the signal-to-noise ratio of 3. Furthermore, the graphene/PB modified electrode exhibits freedom of interference from other co-existing electroactive species. This work provides a new kind of composite modified electrode for amperometric biosensors.