Accession Number : ADA614792


Title :   Nitrogen: Unraveling the Secret to Stable Carbon-Supported Pt-Alloy Electrocatalysts


Descriptive Note : Journal article


Corporate Author : COLORADO SCHOOL OF MINES GOLDEN


Personal Author(s) : Pylypenko, Svitlana ; Borisevich, Albina ; More, Karren L ; Corpuz, April R ; Holme, Timothy ; Dameron, Arrelaine A ; Olson, Tim S ; Dinh, Huyen N ; Gennett, Thomas ; O'Hayre, Ryan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a614792.pdf


Report Date : Oct 2013


Pagination or Media Count : 12


Abstract : Nitrogen functionalities significantly improve performance for metal-based carbon-supported catalysts, yet their specific role is not well understood. In this work, a direct observation of the nanoscale spatial relationship between surface nitrogen and metal catalyst nanoparticles on a carbon support is established through principal component analysis (PCA) of electron energy loss spectral (EELS) imaging datasets acquired on an aberration-corrected scanning transmission electron microscope (STEM). Improved catalyst support interactions correlated to high substrate nitrogen content in immediate proximity to stabilized nanoparticles are first demonstrated using model substrates. These insights are applied in direct methanol fuel cell prototypes to achieve substantial improvements in performance and long-term stability using both in-house and commercial catalysts doped with nitrogen. These results have immediate impact in advanced design and optimization of next generation high performance catalyst materials.


Descriptors :   *DIRECT METHANOL FUEL CELLS , *ELECTROCATALYSTS , *NITROGEN , CARBON , CARBON NANOTUBES , CATALYSTS , DOPING , ELECTROCHEMISTRY , ELECTRON ENERGY , INTERACTIONS , METAL COMPOUNDS , MICROSCOPY , NANOPARTICLES , OPTIMIZATION , PLATINUM ALLOYS , PYROLYTIC GRAPHITE , SPATIAL DISTRIBUTION , STABILITY


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Electrochemical Energy Storage


Distribution Statement : APPROVED FOR PUBLIC RELEASE