Get access
ChemSusChem

New Insights from Microcalorimetry on the FeOx/CNT-Based Electrocatalysts Active in the Conversion of CO2 to Fuels

Authors

  • Dr. Rosa Arrigo,

    Corresponding author
    1. Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    • Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    Search for more papers by this author
  • Dr. Manfred E. Schuster,

    1. Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    Search for more papers by this author
  • Dr. Sabine Wrabetz,

    1. Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    Search for more papers by this author
  • Dr. Frank Girgsdies,

    1. Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    Search for more papers by this author
  • Dr. Jean-Philippe Tessonnier,

    1. Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    2. Department of Chemical Engineering, University of Delaware, 150 Academy Street, Newark, DE 19716 (USA)
    Search for more papers by this author
  • Prof. Gabriele Centi,

    Corresponding author
    1. Department of Industrial Chemistry and Materials Engineering, University of Messina, V.le F. Stagno d'Alcontres, 31, 98166 Messina (Italy)
    • Department of Industrial Chemistry and Materials Engineering, University of Messina, V.le F. Stagno d'Alcontres, 31, 98166 Messina (Italy)
    Search for more papers by this author
  • Prof. Siglinda Perathoner,

    1. Department of Industrial Chemistry and Materials Engineering, University of Messina, V.le F. Stagno d'Alcontres, 31, 98166 Messina (Italy)
    Search for more papers by this author
  • Dr. Dang Sheng Su,

    1. Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang (PR China)
    Search for more papers by this author
  • Prof. Dr. Robert Schlögl

    1. Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4–6, 14195 Berlin (Germany)
    Search for more papers by this author

Abstract

Fe oxide nanoparticles show enhanced electrocatalytic performance in the reduction of CO2 to isopropanol when deposited on an N-functionalized carbon nanotube (CNT) support rather than on a pristine or oxidized CNT support. XRD and high-resolution TEM were used to investigate the nanostructure of the electrocatalysts, and CO2 adsorptive microcalorimetry was used to study the chemical nature of the interaction of CO2 with the surface sites. Although the particles always present the same Fe3O4 phase, their structural anisotropy and size inhomogeneity are consequences of the preparation method of the carbon surface. Two types of chemisorption sites have been determined by using microcalorimetry: irreversible sites (280 kJ mol−1) at the uncoordinated sites of the facets and reversible sites (120 kJ mol−1) at the hydrated oxide surface of the small nanoparticles. N-Functionalization of the carbon support is advantageous, as it causes the formation of small nanoparticles, which are highly populated by reversible chemisorbing sites. These characteristic features correlate with a higher electrocatalytic performance.

Get access to the full text of this article

Ancillary