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Preparation and characterization of AuPt alloy nanoparticle–multi-walled carbon nanotube–ionic liquid composite film for electrocatalytic oxidation of cysteine

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Abstract

Gold–platinum (AuPt) alloy particles were fabricated directly on multi-walled carbon nanotubes (MWNT)–ionic liquid (i.e., trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide, [P6,6,6,14][NTf2]) composite coated glassy carbon electrode (GCE) by electrodeposition method. Scanning electron microscope image showed that they were well-dispersed nanocluster consisting of smaller nanoparticles, and their size was about 70 nm. X-ray diffraction experiment showed that they were single-phase alloy nanomaterial, and the calculated composition was consisting with that obtained by energy dispersive X-ray spectroscopy. The resulting modified electrode (i.e., AuPt–MWNT–[P6,6,6,14][NTf2]/GCE) presented high catalytic activity for the electrochemical oxidation of cysteine. The peak potential of cysteine shifted to 0.42 V (versus saturated calomel electrode) in 0.1 M H2SO4 and the peak current increased greatly in comparison with that on the corresponding Pt (or Au)–MWNT–[P6,6,6,14][NTf2]/GCE. Under the optimized conditions, the oxidation current of cysteine at 0.45 V was linear to its concentration in the range of 5.0 × 10−7 ∼ 4.0 × 10−5 M with a sensitivity of 43.8 mA M−1.

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Acknowledgments

The authors appreciate the support of the National Natural Science Foundation of China (no. 20173040) and the State Key Laboratory of Electroanalytical Chemistry (no. 200805), Changchun Institute of Applied Chemistry, People’s Republic of China.

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Authors and Affiliations

  1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei Province, 430072, People’s Republic of China

    Zhirong Mo, Faqiong Zhao, Fei Xiao & Baizhao Zeng

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  1. Zhirong Mo
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  2. Faqiong Zhao
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  3. Fei Xiao
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  4. Baizhao Zeng
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Correspondence to Baizhao Zeng.

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Mo, Z., Zhao, F., Xiao, F. et al. Preparation and characterization of AuPt alloy nanoparticle–multi-walled carbon nanotube–ionic liquid composite film for electrocatalytic oxidation of cysteine. J Solid State Electrochem 14, 1615–1620 (2010). https://doi.org/10.1007/s10008-010-1003-2

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