Promotion Effects of Sn on the Electrocatalytic Reduction of Nitrate at Rh Nanoparticles

Authors

  • Dr. W. Siriwatcharapiboon,

    1. School of Chemistry, University of Birmingham, Edsbaston, Birmingham, B15 2TT (UK)
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  • Dr. Y. Kwon,

    1. Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden (Netherlands)
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  • Dr. J. Yang,

    1. Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden (Netherlands)
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  • Dr. R. L. Chantry,

    1. Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edsbaston, Birmingham, B15 2TT (UK)
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  • Dr. Z. Li,

    1. Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edsbaston, Birmingham, B15 2TT (UK)
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  • Dr. S. L. Horswell,

    Corresponding author
    1. School of Chemistry, University of Birmingham, Edsbaston, Birmingham, B15 2TT (UK)
    • S. L. Horswell, School of Chemistry, University of Birmingham, Edsbaston, Birmingham, B15 2TT (UK)===

      M. T. M. Koper, Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden (Netherlands)===

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  • Prof. Dr. M. T. M. Koper

    Corresponding author
    1. Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden (Netherlands)
    • S. L. Horswell, School of Chemistry, University of Birmingham, Edsbaston, Birmingham, B15 2TT (UK)===

      M. T. M. Koper, Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden (Netherlands)===

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Abstract

We present a comparative study of the activity and selectivity of Rh/C nanoparticles and Sn-modified Rh/C nanoparticles towards electrocatalytic nitrate reduction in sulfuric acid. Electrochemical techniques, combined with more direct analytical techniques such as mass spectrometry and ion chromatography, were applied to analyse the products obtained during the reaction. Online electrochemical mass spectrometry was employed to detect volatile products, such as nitric oxide (NO), nitrous oxide (N2O) and dinitrogen (N2). The combination of online sample collection to the electrochemical cell and offline ion chromatography allows the quantitative analysis of non-volatile products, such as ammonium (equation image) and hydroxylamine (NH3OH+). Non-volatile products can be detected during nitrate reduction at Rh/C electrodes. The catalytic activity of Rh/C electrodes can be enhanced by Sn modification. N2O is the dominant volatile product at SnRh/C electrodes. equation image is the main ionic product at the Rh/C electrodes, whereas modification by Sn also leads to the formation of NH3OH+.

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