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Related Experiment Video

Updated: Jul 8, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

Improved oxygen reduction cathodes using polyoxometalate cocatalysts.

Anand V Sankarraj1, Sridevi Ramakrishnan, Curtis Shannon

  • 1Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849-5312, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 9, 2008
PubMed
Summary

Transition-metal-substituted polyoxometalates significantly enhance oxygen reduction reaction (ORR) potentials on gold. Cobalt-substituted PCoW11O39(5-) on platinum cathodes show promising catalytic activity, comparable to bimetallic catalysts.

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Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Materials Science

Background:

  • The oxygen reduction reaction (ORR) is crucial for energy conversion technologies.
  • Developing efficient electrocatalysts for ORR is a key challenge.
  • Polyoxometalates (POMs) offer tunable structures for catalytic applications.

Purpose of the Study:

  • To investigate the effect of transition-metal-substituted Wells-Dawson and Keggin polyoxometalates on the oxygen reduction reaction.
  • To evaluate the performance of these POMs as cocatalysts on gold, palladium, and platinum electrodes.
  • To understand the relationship between POM structure and ORR catalytic activity.

Main Methods:

  • Synthesis and characterization of transition-metal-substituted Wells-Dawson and Keggin polyoxometalates.

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Last Updated: Jul 8, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

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  • Electrochemical measurements of the oxygen reduction reaction (ORR) on modified Au, Pd, and Pt electrodes.
  • Application of a thermodynamic model to explain observed potential shifts.

    • Main Results:

    • Wells-Dawson polyoxometalates adsorbed on gold electrodes induced significant positive shifts in the ORR potential.
    • The magnitude of the potential shift correlated with the specific transition metal incorporated into the POM.
    • The PCoW11O39(5-) cocatalyst paired with a platinum cathode yielded the best performance, with a +54 mV positive shift in ORR potential.

    Conclusions:

    • Transition-metal-substituted polyoxometalates can effectively enhance ORR electrocatalysis.
    • The PCoW11O39(5-) / Pt system demonstrates catalytic activity competitive with state-of-the-art bimetallic catalysts.
    • This study highlights the potential of tailored polyoxometalates as efficient ORR cocatalysts.