Metal-free nitrogen-doped graphenic materials as cathode catalysts for the oxygen reduction reaction in polymer electrolyte membrane fuel cells

Exhibiting a very high surface area, good electrical conductivity and density of active sites, nitrogen-doped graphenic materials are considered as promising catalysts for the oxygen reduction reaction (ORR). Seldom studied in acidic media, N-doped foams were tested here cathode polymer electrolyte membrane fuel cell (PEMFC). The prepared via solvothermal-based process, by reacting either cyclohexanol ethanolamine or 1-(2-hydroxyethylethyl) piperidine with metallic sodium, under pressure temperature. Membrane electrode assemblies Pt/C anode, 212 Nafion membrane, an 8 mm disk based on materials. performance exhibited PEMFC was evaluated using chronopotentiometry impedance spectroscopy, depending synthesis conditions. kinetic parameters ORR estimated interpretation experimental data: Tafel slope found might express partial control diffusion through microporous structure. Relationships between electrochemical behavior their structural properties discussed. Moderately crystallized low content showed highest catalytic properties, current larger than 30 mA cm−2 maximum power at 2.3 mW cm−2.