Au/Nafion复合膜的制备及其在Li-O2电池中的应用

通过真空蒸镀法将金与Nafion膜进行复合得到Au/Nafion复合膜,使用阻抗和恒电流极化分析得到其与锂负极有良好的兼容性和较小的界面电阻,应用在Li-O2电池中,电池放电电压平台高,不会出现"突然死亡"现象,说明它隔绝了负极与电解液的接触,起到锂负极保护的作用。

Nafion-Au-Nafion修饰玻碳电极循环伏安法测定莱克多巴胺

用Nafion-Au-Nafion修饰玻碳电极,探讨莱克多巴胺的电化学行为,建立了检测莱克多巴胺的循环伏安电化学传感方法。实验结果表明,在pH值2.0,B-R为支持液,富积时间120 s,扫描速度50 mV·s^(-1),电位为1.1 V的条件下,循环伏安法测定莱克多巴胺检测限可达2μg·L^(-1),线性范围为0.02～20 mg^(-1),操作简便,检测迅速(检测时间不超过5 min),适合大批量样品检测,具有很好的应用前景。

Oxidation and Adsorption of CO at Pt-Au-SPE Electrodes

Pt?Au-SPE electrodes made by the successive chemical deposition of Au and Pt on Nafion membranes were tested and compared with the single metal-SPE electrodes for surface oxidation, CO adsorption and oxidation. Part of the surface of the binary metal electrodes behaves differently from either Au or Pt single metal-SPE electrode for COads oxidation, revealing surface modulation effects in the binary metal electrode. However, these mudulated surfaces have no appreciable contribution to the electrode activity for CO oxidation. The electrode activity for CO oxidation is mainly governed by the total Pt surface area of the binary electrodes. The predeposited Au was found to be favorable for higher dispersion of the successively deposited Pt.

免标记自增强电化学发光免疫传感器超灵敏检测河豚毒素

以Nafion固定钌联吡啶Au纳米颗粒(Ru(bpy)2+3-Au NPs)于玻碳电极(GCE),借助Au—N共价键固定河豚毒素抗体(anti-TTX),通过抗原抗体的特异性结合构建了超灵敏检测河豚毒素(TTX)的免标记自增强电化学发光(ECL)免疫传感器。当目标物TTX被特异性捕获到修饰电极表面后,可以作为Ru(bpy)2+3的共反应物增强ECL信号。与共反应物存在于溶液中或标记于二抗上相比,其优点在于发光体和共反应物之间的电子转移距离更短,可有效改善电化学发光效率,降低实验成本。最佳条件下,TTX质量浓度在0.01~1 000μg·L-1范围内与ECL信号呈良好的线性关系,检出限(LOD)为0.01μg·L-1。此免标记自增强型ECL免疫传感器显示出优异的稳定性、重现性和灵敏度,对实际样品中TTX的回收率为98.0%~104.0%,表明其具有较好的实用价值。