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High-performance alkaline direct methanol fuel cell using a nitrogen-postdoped anode.

Prabhuram Joghee1, Svitlana Pylypenko, Kevin Wood

  • 1Department of Metallurgical&Materials Engineering, Colorado School of Mines (CSM), 1500 Illinois St., Golden CO 80401 (USA), Fax: (+1) 303-273-3057.

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|June 4, 2014
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Summary

Nitrogen postdoping significantly boosts platinum-ruthenium/carbon (PtRu/C) catalyst performance in alkaline direct methanol fuel cells. This enhancement is linked to a larger electrochemical surface area, improving fuel cell efficiency.

Keywords:
electrochemistryfuel cellsion exchangemembranesoxidation

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Direct methanol fuel cells (DMFCs) are promising energy conversion devices.
  • Alkaline electrolytes offer advantages over acidic media for DMFCs.
  • Platinum-ruthenium (PtRu) alloys are state-of-the-art anode catalysts for methanol oxidation.

Purpose of the Study:

  • To investigate the effect of nitrogen postdoping on the performance of commercial PtRu/C catalysts in alkaline DMFCs.
  • To understand the underlying reasons for any observed performance changes.

Main Methods:

  • Commercial PtRu/C catalyst was postdoped with nitrogen.
  • Electrochemical performance was evaluated in an alkaline direct methanol fuel cell setup.
  • Electrochemical surface area was measured to correlate with performance.

Main Results:

  • Nitrogen postdoped PtRu/C catalysts exhibited a 10-20% performance improvement compared to unmodified catalysts.
  • The enhanced performance was correlated with an increased electrochemical surface area of the nitrogen-treated catalyst.
  • Nitrogen doping did not negatively impact catalyst stability within the tested parameters.

Conclusions:

  • Nitrogen postdoping is an effective strategy to enhance the performance of PtRu/C catalysts for alkaline DMFC anodes.
  • Increased electrochemical surface area is a key factor contributing to the improved catalytic activity.
  • This approach offers a viable route for developing more efficient alkaline direct methanol fuel cells.