Metal-nitrogen-carbon oxygen reduction catalysts by high pressure pyrolysis using ammonia-generating precursors

Vijayadurga Nallathambi, Nathaniel Leonard, Scott Calabrese Barton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 1 Citations

Abstract

High surface area Metal-nitrogen-carbon (MNC) cathode catalysts for oxygen reduction in low temperature fuel cells were synthesized by pyrolysis of iron-acetate, ketjen black and nitrogen precursors in a closed, constant volume reaction vessel. Autogenic pressure generated by nitrogen precursor evaporation and decomposition during pyrolysis leads to nitrogen intermediates with high activity and mobility, contributing to increased nitrogen retention and activity. N Precursors such as ammonium hydroxide, urea and ammonium carbamate were studied, because they produce an ammonia gas intermediate that can etch non-graphitic carbon, increasing mesoporous surface area and accessible active site density. The most active catalysts were obtained in this work using ammonium carbamate, and kinetic current density as high as 15 A cm-3 at 0.8 ViR-free and over 100 h of stable current at 0.5 V were observed in single fuel cell measurements.

LanguageEnglish (US)
Title of host publicationACS National Meeting Book of Abstracts
StatePublished - 2011
Event241st ACS National Meeting and Exposition - Anaheim, CA, United States
Duration: Mar 27 2011Mar 31 2011

Other

Other241st ACS National Meeting and Exposition
CountryUnited States
CityAnaheim, CA
Period3/27/113/31/11

Profile

Ammonia
Pyrolysis
Nitrogen
Carbon
Metals
Oxygen
Catalysts
Fuel cells
Ammonium Hydroxide
Ammonium hydroxide
Urea
Evaporation
Acetates
Cathodes
Current density
Iron
Gases
Decomposition
Kinetics
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Metal-nitrogen-carbon oxygen reduction catalysts by high pressure pyrolysis using ammonia-generating precursors. / Nallathambi, Vijayadurga; Leonard, Nathaniel; Barton, Scott Calabrese.

ACS National Meeting Book of Abstracts. 2011.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nallathambi, V, Leonard, N & Barton, SC 2011, Metal-nitrogen-carbon oxygen reduction catalysts by high pressure pyrolysis using ammonia-generating precursors. in ACS National Meeting Book of Abstracts. 241st ACS National Meeting and Exposition, Anaheim, CA, United States, 3/27/11.
Nallathambi, Vijayadurga ; Leonard, Nathaniel ; Barton, Scott Calabrese. / Metal-nitrogen-carbon oxygen reduction catalysts by high pressure pyrolysis using ammonia-generating precursors. ACS National Meeting Book of Abstracts. 2011.
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