skip to main content

Search for: All records

Creators/Authors contains: "DiSalvo, Francis J."

Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

  1. Free, publicly-accessible full text available April 8, 2023
  2. A systematic study explores transition metal nitrides for nonprecious oxygen reduction electrocatalysts in alkaline fuel cells.
    Free, publicly-accessible full text available February 4, 2023
  3. Free, publicly-accessible full text available February 17, 2023
  4. Alkaline fuel cells enable the use of earth-abundant elements to replace Pt but are hindered by the sluggish kinetics of the hydrogen oxidation reaction (HOR) in alkaline media. Precious metal–free HOR electrocatalysts need to overcome two major challenges: their low intrinsic activity from too strong a hydrogen-binding energy and poor durability due to rapid passivation from metal oxide formation. Here, we designed a Ni-based electrocatalyst with a 2-nm nitrogen-doped carbon shell (Ni@CN x ) that serves as a protection layer and significantly enhances HOR kinetics. A Ni@CN x anode, paired with a Co−Mn spinel cathode, exhibited a record peak power density of over 200 mW/cm 2 in a completely precious metal–free alkaline membrane fuel cell. Ni@CN x exhibited superior durability when compared to a Ni nanoparticle catalyst due to the enhanced oxidation resistance provided by the CN x layer. Density functional theory calculations suggest that graphitic carbon layers on the surface of the Ni nanoparticles lower the H binding energy to Ni, bringing it closer to the previously predicted value for optimal HOR activity, and single Ni atoms anchored to pyridinic or pyrrolic N defects of graphene can serve as the HOR active sites. The strategy described here marks amore »milestone in electrocatalyst design for low-cost hydrogen fuel cells and other energy technologies with completely precious metal–free electrocatalysts.« less
    Free, publicly-accessible full text available March 29, 2023
  5. null (Ed.)