Facile fabrication of network film electrodes with ultrathin Au nanowires for nonenzymatic glucose sensing and glucose/O₂ fuel cell

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• 作者：Lu Yang ; Yijia Zhang ; Mi Chu ; Wenfang Deng ; Yueming Tan ; Ming Ma ; Xiaoli Su ; Qingji Xie ; Shuozhuo Yao
• 关键词：Network film electrode ; Nonenzymatic glucose sensing ; Glucose/O2 fuel cell ; Ultrathin Au nanowires
• 刊名：Biosensors and Bioelectronics
• 出版年：15 February, 2014
• 年：2014
• 卷：52
• 期：Complete
• 页码：105-110
• 全文大小：1336 K

文摘

We report here on the facile fabrication of network film electrodes with ultrathin Au nanowires (AuNWs) and their electrochemical applications for high-performance nonenzymatic glucose sensing and glucose/O₂ fuel cell under physiological conditions (pH 7.4, containing 0.15 M Cl^{鈭?/sup>). AuNWs with an average diameter of ~7 or 2 nm were prepared and can self-assemble into robust network films on common electrodes. The network film electrode fabricated with 2-nm AuNWs exhibits high sensitivity (56.0 渭A cm鈭? mM鈭?), low detection limit (20 渭M), short response time (within 10 s), excellent selectivity, and good storage stability for nonenzymatic glucose sensing. Glucose/O₂ fuel cells were constructed using network film electrodes as the anode and commercial Pt/C catalyst modified glassy carbon electrode as cathode. The glucose/O₂ fuel cell using 2-nm AuNWs as anode catalyst output a maximum power density of is 126 渭W cm鈭?, an open-circuit cell voltage of 0.425 V, and a short-circuit current density of 1.34 mA cm鈭?, respectively. Due to the higher specific electroactive surface area of 2-nm AuNWs, the network film electrode fabricated with 2-nm AuNWs exhibited higher electrocatalytic activity toward glucose oxidation than the network film electrode fabricated with 7-nm AuNWs. The network film electrode exhibits high electrocatalytic activity toward glucose oxidation under physiological conditions, which is helpful for constructing implantable electronic devices.}