4/3/2023 0 Comments Cathode reactionUniversality in oxygen reduction electrocatalysis on metal surfaces. Universality in oxygen evolution electrocatalysis on oxide surfaces. Thermodynamic theory of multi-electron transfer reactions: implications for electrocatalysis. Origin of the overpotential for oxygen reduction at a fuel-cell cathode. Identification of catalytic sites in cobalt-nitrogen-carbon materials for the oxygen reduction reaction. Direct atomic-level insight into the active sites of a high-performance PGM-free ORR catalyst. Identification of catalytic sites for oxygen reduction in iron- and nitrogen-doped graphene materials. A review of Fe–N/C and Co–N/C catalysts for the oxygen reduction reaction. Quantifying the density and utilization of active sites in non-precious metal oxygen electroreduction catalysts. Understanding the high activity of Fe–N–C electrocatalysts in oxygen reduction: Fe/Fe 3C nanoparticles boost the activity of Fe–N x. A class of non-precious metal composite catalysts for fuel cells. High-performance electrocatalysts for oxygen reduction derived from polyaniline, iron, and cobalt. Iron-based catalysts with improved oxygen reduction activity in polymer electrolyte fuel cells. A review of platinum-based catalyst layer degradation in proton exchange membrane fuel cells. The role of platinum in proton exchange membrane fuel cells. Membrane and catalyst performance targets for automotive fuel cells by FCCJ membrane, catalyst, MEA WG. Mitigation of chemical membrane degradation in fuel cells: understanding the effect of cell voltage and iron ion redox cycle. The superior proton-exchange membrane fuel cell performance of SnNC cathode catalysts under realistic, hydrogen–air fuel cell conditions, particularly after NH 3 activation treatment, makes them a promising alternative to today’s state-of-the-art Fe-based catalysts. A range of analytical techniques combined with density functional theory calculations indicate that stannic Sn( iv)N x single-metal sites with moderate oxygen chemisorption properties and low pyridinic N coordination numbers act as catalytically active moieties. Additional benefits include a highly favourable selectivity for the four-electron reduction pathway and a Fenton-inactive character of Sn. The SnNC-NH 3 catalysts displayed a 40–50% higher current density than FeNC-NH 3 at cell voltages below 0.7 V. The prepared SnNC catalysts meet and exceed state-of-the-art FeNC catalysts in terms of intrinsic catalytic turn-over frequency and hydrogen–air fuel cell power density. This contribution reports the discovery and analysis of a p-block Sn-based catalyst for the electroreduction of molecular oxygen in acidic conditions at fuel cell cathodes the catalyst is free of platinum-group metals and contains single-metal-atom actives sites coordinated by nitrogen.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |