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Electrocatalytic oxygen evolution at surface-oxidized multiwall carbon nanotubes.

Xunyu Lu1, Wai-Leung Yim, Bryan H R Suryanto

  • 1School of Chemistry, The University of New South Wales , Sydney, New South Wales 2052, Australia.

Journal of the American Chemical Society
|February 7, 2015
PubMed
Summary

Multiwall carbon nanotubes (MWCNTs) can act as efficient catalysts for water oxidation, a key step in producing hydrogen fuel. Surface modifications enable MWCNTs to initiate the oxygen evolution reaction effectively.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Efficient water oxidation catalysts are crucial for large-scale renewable energy storage using hydrogen fuel.
  • Carbon nanotubes are explored as substrates for nanoparticle catalysts.
  • Developing abundant and efficient catalysts is a key challenge.

Purpose of the Study:

  • To investigate the potential of multiwall carbon nanotubes (MWCNTs) as intrinsic water oxidation catalysts.
  • To understand the role of surface functional groups in catalytic activity.

Main Methods:

  • Mild surface oxidation of MWCNTs.
  • Hydrothermal annealing.
  • Electrochemical activation.
  • Electrochemical measurements in alkaline media.

Main Results:

  • MWCNTs demonstrated effectiveness as water oxidation catalysts, initiating the oxygen evolution reaction (OER) at low overpotentials (0.3 V).
  • Ketonic oxygen-containing functional groups on MWCNT surfaces were identified as crucial for OER catalysis.
  • These functional groups alter electronic structures and facilitate intermediate adsorption.
  • Preserved nanostructure and inner wall conductivity of MWCNTs ensured efficient electron transport.

Conclusions:

  • Surface-modified MWCNTs are efficient, abundant catalysts for the oxygen evolution reaction.
  • The catalytic activity is attributed to specific oxygen functional groups and the inherent properties of MWCNTs.
  • This finding offers a promising pathway for developing catalysts for hydrogen production via water splitting.