tailieunhanh - Báo cáo hóa học: " Pt-decorated nanoporous gold for glucose electrooxidation in neutral and alkaline solutions"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Pt-decorated nanoporous gold for glucose electrooxidation in neutral and alkaline solutions | Yan et al. Nanoscale Research Letters 2011 6 313 http content 6 1 313 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Pt-decorated nanoporous gold for glucose electrooxidation in neutral and alkaline solutions Xiuling Yan1 2 Xingbo Ge 1 and Songzhi Cui1 Abstract Exploiting electrocatalysts with high activity for glucose oxidation is of central importance for practical applications such as glucose fuel cell. Pt-decorated nanoporous gold NPG-Pt created by depositing a thin layer of Pt on NPG surface was proposed as an active electrode for glucose electrooxidation in neutral and alkaline solutions. The structure and surface properties of NPG-Pt were characterized by scanning electron microscopy SEM transmission electron microscopy TEM X-ray powder diffraction XRD and cyclic voltammetry CV . The electrocatalytic activity toward glucose oxidation in neutral and alkaline solutions was evaluated which was found to depend strongly on the surface structure of NPG-Pt. A direct glucose fuel cell DGFC was performed based on the novel membrane electrode materials. With a low precious metal load of less than mg cm-2 Au and 60 gg cm-2 Pt in anode and commercial Pt C in cathode the performance of DGFC in alkaline is much better than that in neutral condition. Introduction Glucose is widely used in modern life and industry as a nontoxic inexpensive and renewable resource. Since Rao and Drake 1 first reported the glucose oxidation on platinized-Pt electrodes in phosphate buffer solution in the 1960s electrocatalytic oxidation of glucose has been extensively investigated as a key reaction in the fields of sensors 2 3 and fuel cells 4 5 . Great efforts have been made to develop catalytically active electrode materials for this reaction in the past two decades. As one of the most studied electrocatalyst Pt was found to exhibit considerable activity for glucose oxidation at a negative potential in neutral and alkaline solutions 6