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Platinum–tin complexes as catalysts for the anodic oxidation of borohydride

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Abstract

Platinum–tin complexes were prepared by the reduction of Pt(IV) with Sn(II) in HCl media and studied by light absorption spectrometry, X-ray photoelectron spectroscopy (XPS), and electron microscopy. The formation of three complexes, H3[Pt(SnCl3)5], H2[Pt(SnCl3)2Cl2], and H2[Pt3(SnCl3)8], depending on HCl and SnCl2 concentrations, has been shown. The glassy carbon (GC) electrode modified in the complexes solutions was found to be an electrocatalyst for borohydride oxidation in a 1.0-M NaOH solution. Comparison of BH4 − electrooxidation on Pt and on GC modified with platinum–tin complexes has shown that catalytic hydrolysis of BH4 − did not proceed in the latter case in contrast to its oxidation on the Pt electrode, and only direct BH4 − oxidation has been observed in the positive potentials scan. The activity of Pt–Sn complexes for BH4 − oxidation changes with time and eventually decreases due to Sn(II), bound in the complex with Pt(II), oxidation by atmospheric oxygen. The complexes may be renewed by addition of missing amounts of SnCl2 and HCl.

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Acknowledgments

The authors wish to express their gratitude to Dr. Aldona Jagminienė for the help in the recording of light absorption spectra and Dr. Marija Kurtinaitienė for electron microscopy studies.

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Authors and Affiliations

  1. Institute of Chemistry, A. Goštauto 9, LT-01108, Vilnius, Lithuania

    Rima Tarozaitė, Loreta Tamašauskaitė Tamašiūnaitė & Vitalija Jasulaitienė

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  1. Rima Tarozaitė
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  2. Loreta Tamašauskaitė Tamašiūnaitė
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  3. Vitalija Jasulaitienė
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Correspondence to Loreta Tamašauskaitė Tamašiūnaitė.

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Tarozaitė, R., Tamašauskaitė Tamašiūnaitė, L. & Jasulaitienė, V. Platinum–tin complexes as catalysts for the anodic oxidation of borohydride. J Solid State Electrochem 13, 721–731 (2009). https://doi.org/10.1007/s10008-008-0606-3

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  • DOI: https://doi.org/10.1007/s10008-008-0606-3

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