Effects of the induced micro- and meso-porosity on the single site density and turn over frequency of Fe-N-C carbon electrodes for the oxygen reduction reaction

  title={Effects of the induced micro- and meso-porosity on the single site density and turn over frequency of Fe-N-C carbon electrodes for the oxygen reduction reaction},
  author={Marco Mazzucato and Giorgia Daniel and Asad Mehmood and Tomasz Kosmala and Gaetano Granozzi and Anthony R. J. Kucernak and Christian Durante},
  journal={Applied Catalysis B-environmental},
22 Citations
Sulfur Doping versus Hierarchical Pore Structure: The Dominating Effect on the Fe–N–C Site Density, Activity, and Selectivity in Oxygen Reduction Reaction Electrocatalysis
It was found that the Fe–N–C catalytic activity does not directly depend on sulfur content, but rather on the microporous surface and therefore any electronic effect appears not to be determinant as confirmed by X-ray photoemission spectroscopy.
A Mild CO2 Etching Method To Tailor the Pore Structure of Platinum-Free Oxygen Reduction Catalysts in Proton Exchange Membrane Fuel Cells.
Through employing the Fe/N/C electrocatalysts as a model, the intrinsic impact of the pore structure on ORR activity was revealed and the CO2 etching method developed a high-quality electrocatalyst with polarization performance exceeding that of the commercial Pt/C catalyst in the fuel cell working voltage region (>0.65 V).
Highly Graphitized Fe-N-C Electrocatalysts Prepared from Chitosan Hydrogel Frameworks
The development of platinum group metal-free (PGM-free) electrocatalysts derived from cheap and environmentally friendly biomasses for oxygen reduction reaction (ORR) is a topic of relevant interest,
Activation of bimetallic PtFe nanoparticles with zeolite-type cesium salts of vanadium-substituted polyoxometallates toward electroreduction of oxygen at low Pt loadings for fuel cells
The catalytic activity of commercial carbon-supported PtFe (PtFe/C) nanoparticles admixed with mesoporous polyoxometalate Cs 3 H 3 PMo 9 V 3 O 40 , (POM3-3–9), has been evaluated towards oxygen
Engineering the Local Coordination Environment and Density of FeN4 Sites by Mn Cooperation for Electrocatalytic Oxygen Reduction.
Single atom sites (SAS) of FeN4 are clarified as one of the most active components for the oxygen reduction reaction (ORR). Effective strategies by engineering the local coordination environment and


Heat-treated Fe/N/C catalysts for O2 electroreduction: are active sites hosted in micropores?
It is reported that the activation process of carbon black and iron acetate heat-treated in NH(3) comprises three consecutive steps: incorporation of nitrogen atoms in the carbon, micropore formation through reaction between carbon and ammonia, and completion of active sites in the micropores by reaction of iron with ammonia.
Design Principle of Fe-N-C Electrocatalysts: How to Optimize Multimodal Porous Structures?
The optimized catalyst exhibits one of the best ORR performance in alkaline medium with excellent long-term stability in anion exchange membrane fuel cell and accelerated durability test and establishes a basis for rationale design of the porous carbon structure for electrocatalyst applications.
Effect of iron-carbide formation on the number of active sites in Fe–N–C catalysts for the oxygen reduction reaction in acidic media
In this work Fe–N–C catalysts were prepared by the oxalate-supported pyrolysis of FeTMPPCl or H2TMPP either in the presence or absence of sulfur. The well-known enhancing effect of sulfur-addition on
In situ electrochemical quantification of active sites in Fe–N/C non-precious metal catalysts
A protocol is demonstrated that allows the quantification of active centres, which operate under acidic conditions, by means of nitrite adsorption followed by reductive stripping, and show direct correlation to the catalytic activity.
Density Functional Theory (DFT) and Experimental Evidences of Metal–Support Interaction in Platinum Nanoparticles Supported on Nitrogen- and Sulfur-Doped Mesoporous Carbons: Synthesis, Activity, and Stability
In this paper, we report a comprehensive investigation of Pt nanoparticles (NPs) deposition on nitrogen- and sulfur-doped or codoped mesoporous carbons (N-MC, S-MC, and N,S-MC) to develop active and
Quantifying the density and utilization of active sites in non-precious metal oxygen electroreduction catalysts
A successful quantification of bulk and surface-based active-site density and associated turn-over frequency values of mono- and bimetallic Fe/N-doped carbons using a combination of chemisorption, desorption and 57Fe Mössbauer spectroscopy techniques is reported.
A specific demetalation of Fe–N4 catalytic sites in the micropores of NC_Ar + NH3 is at the origin of the initial activity loss of the highly active Fe/N/C catalyst used for the reduction of oxygen in PEM fuel cells
In this study, we explored the behavior of NC_Ar + NH3, an initially highly active catalyst for oxygen electroreduction, in H2/air fuel cells from 0.8 to 0.2 V at 80 °C and 25 °C, in order to find