Fast conversion of redox couple on Ni(OH)2/C nanocomposite electrode for high-performance nonenzymatic glucose sensor

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• 作者：Linan Wang ; Yang Tang ; Liu Wang ; Haibin Zhu…
• 关键词：Conversion redox ; Ni(OH)2 ; Nanocomposite ; Glucose ; Nonenzymatic sensor
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：19
• 期：3
• 页码：851-860
• 全文大小：1,869 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768

文摘

To pursue high performance for nonenzymatic glucose sensor, fast conversion of redox couple (Ni(OH)2?NiOOH: NiII/NiIII) was established on Ni(OH)2 nanoparticles modified carbon (Ni(OH)2/C) composite electrode coupling with concentrated hydroxide electrolyte. The electrode was prepared by in situ precipitation of nano-Ni(OH)2 on carbon and then treated by cyclic voltammetry. Cyclic voltammetry was also used to identify the extremely high conversion rate of NiII/NiIII on the prepared composite electrode. Continuous cyclic voltammetry method with increasing the concentration of glucose on each cycle step by step was employed to promptly determine linear range and appropriate potential for glucose detection in 0.1, 1, and 7?M KOH electrolyte. The amperometric measurement under the optimized condition (0.28?V vs. saturated calomel electrode (SCE) in 7?M KOH) showed that the Ni(OH)2/C composite electrode exhibits a sensitivity of 1004.6?μA?mM??cm? in a wide linear range from 1?μM to 15?mM (R--.9999). What is more, favorable selectivity, reproducibility, and stability for glucose detection were also obtained. These performances indicated that the proposed Ni(OH)2/C nanocomposite sensor with fast conversion of redox couple is a promising nonenzymatic glucose sensor. Graphical Abstract The conversion of Ni(OH)2?NiOOH, which is the key reaction for nickel-based glucose sensor, was accelerated on highly active Ni(OH)2/carbon nanocomposite electrode in concentrated alkali electrolyte. The sensitivity, linear range, and proper potential for glucose detection were promptly identified by the continuous cyclic voltammetry with increasing C glucose in steps. The nanocomposite electrode also showed the extended linear range of glucose detection with high sensitivity in amperometric measurement