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Electrochemical behavior of K3Fe(CN)6 in water-in-oil microemulsion

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Abstract

A water-in-oil (W/O) microemulsion composed of Triton X-100, n-hexanol, n-hexane and water solution with hydrochloric acid was prepared. K3Fe(CN)6 was added in as a water-soluble electroactive probe, and its electrochemical behavior was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It is found that the H+ concentration of the water phase has a great effect on the conductivity of the W/O microemulsion, and hence influences the electrochemical behavior of K3Fe(CN)6. When the pH value of water phase is about 7, the electrical conductivity of the W/O microemulsion is only 1.2×10−6 S/cm, and K3Fe(CN)6 almost cannot react at the glassy carbon electrode. But when the H+ concentration is more than 3 mol/L, the W/O microemulsion has a good electrical conductivity and K3Fe(CN)6 shows good electrochemical performance in it. The results of CV and EIS studies indicate that the electrochemical behavior of Fe(CN)6 3−/Fe(CN)6 4− in the W/O microemulsion is different from that in the aqueous solution. This may be due to the unique liquid structure of the W/O microemulsion and the unique mass transfer in the W/O microemulsion.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China

    Hai-hui Zhou  (周海晖), Wei Zeng  (曾伟), Xiao-fang Ying  (英晓芳), Jin-xiang Zeng  (曾金祥), Dan Li  (李丹), Jin-hua Chen  (陈金华) & Ya-fei Kuang  (旷亚非)

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  1. Hai-hui Zhou  (周海晖)
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  2. Wei Zeng  (曾伟)
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  3. Xiao-fang Ying  (英晓芳)
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  4. Jin-xiang Zeng  (曾金祥)
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  5. Dan Li  (李丹)
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  6. Jin-hua Chen  (陈金华)
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  7. Ya-fei Kuang  (旷亚非)
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Correspondence to Hai-hui Zhou  (周海晖).

Additional information

Foundation item: Projects(20673036, J0830415) supported by the National Natural Science Foundation of China; Projects(05JT1026, 2007JT2013) supported by the Science Technology Project of Hunan Province, China

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Zhou, Hh., Zeng, W., Ying, Xf. et al. Electrochemical behavior of K3Fe(CN)6 in water-in-oil microemulsion. J. Cent. South Univ. Technol. 16, 61–65 (2009). https://doi.org/10.1007/s11771-009-0010-x

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  • DOI: https://doi.org/10.1007/s11771-009-0010-x

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