Bulletin of the Korean Chemical Society

  • 제34권2호
  • /
  • Pages.475-481
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  • 2013
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Direct Electrochemistry and Electrocatalysis of Myoglobin with CoMoO4 Nanorods Modified Carbon Ionic Liquid Electrode

  • Zhao, Zengying (School of Science, National Laboratory of Mineral Materials, China University of Geosciences) ;
  • Cao, Lili (College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology) ;
  • Hu, Anhui (College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology) ;
  • Zhang, Weili (College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology) ;
  • Ju, Xiaomei (College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology) ;
  • Zhang, Yuanyuan (College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology) ;
  • Sun, Wei (College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology)
  • 투고 : 2012.10.19
  • 심사 : 2012.11.19
  • 발행 : 2013.02.20
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초록

By using ionic liquid 1-hexylpyridinium hexafluorophosphate ($HPPF_6$) based carbon ionic liquid electrode (CILE) as the substrate electrode, a $CoMoO_4$ nanorods and myoglobin (Mb) composite was casted on the surface of CILE with chitosan (CTS) as the film forming material to obtain the modified electrode (CTS/$CoMoO_4$-Mb/CILE). Spectroscopic results indicated that Mb retained its native structures without any conformational changes after mixed with $CoMoO_4$ nanorods and CTS. Electrochemical behaviors of Mb on the electrode were carefully investigated by cyclic voltammetry with a pair of well-defined redox peaks from the heme Fe(III)/Fe(II) redox center of Mb appeared, which indicated that direct electron transfer between Mb and CILE was realized. Electrochemical parameters such as the electron transfer number (n), charge transfer coefficient (${\alpha}$) and electron transfer rate constant ($k_s$) were estimated by cyclic voltammetry with the results as 1.09, 0.53 and 1.16 $s^{-1}$, respectively. The Mb modified electrode showed good electrocatalytic ability toward the reduction of trichloroacetic acid in the concentration range from 0.1 to 32.0 mmol $L^{-1}$ with the detection limit as 0.036 mmol $L^{-1}$ ($3{\sigma}$), and the reduction of $H_2O_2$ in the concentration range from 0.12 to 397.0 ${\mu}mol\;L^{-1}$ with the detection limit as 0.0426 ${\mu}mol\;L^{-1}$ ($3{\sigma}$).

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피인용 문헌

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