Electrocatalytic Mechanisms in Nitrogen-Doped Carbon Materials

Nitrogen-doped carbon materials have emerged as versatile, metal‐free electrocatalysts for key reactions such as the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Incorporation of nitrogen into carbon frameworks generates distinct bonding configurations—pyridinic, pyrrolic, graphitic and oxidised nitrogen—that modulate local electronic structure, charge density and adsorption energies of reactants. These heteroatom‐induced defects enhance electrical conductivity, introduce active sites for oxygen adsorption and facilitate electron transfer across the electrode–electrolyte interface. Mechanistic studies reveal that the ratio and spatial distribution of pyridinic and graphitic nitrogen directly influence the binding strength of O₂ intermediates, while synergistic interactions between different nitrogen moieties can optimise the reaction pathway toward a four‐electron transfer. Porous architectures and high surface area further expose active edge sites, enabling efficient mass transport. Collectively, these features underpin advances in fuel cells, metal–air batteries and water‐splitting devices, offering a sustainable route to replace precious metal catalysts with earth‐abundant carbon‐based alternatives.

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Electrocatalytic Mechanisms in Nitrogen-Doped Carbon Materials publication trend

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Technical terms

Electrocatalysis: The acceleration of electrochemical reactions at electrode surfaces by specialised catalysts.

Oxygen reduction reaction (ORR): A key cathodic process in fuel cells and metal–air batteries, involving the multi‐electron reduction of O₂ to water or hydroxide.

Pyridinic nitrogen: Nitrogen atoms bonded to two carbon atoms at the edge of graphene layers, contributing one lone pair to the π system.

Graphitic nitrogen: Nitrogen atoms substituting carbon within graphitic planes, bonded to three carbon atoms and donating electron density to the conjugated network.

Active site: A specific atomic arrangement on a catalyst surface where reactants adsorb and undergo chemical transformation.

Near‐edge X‐ray absorption fine structure (NEXAFS): A spectroscopic technique probing unoccupied electronic states near an element’s absorption edge to elucidate local chemical environment.

References

1. Electronic synergism of pyridinic- and graphitic-nitrogen on N-doped carbons for the oxygen reduction reaction. Chemical Science (2019).
2. Nitrogen‐Rich Carbonaceous Materials for Advanced Oxygen Electrocatalysis: Synthesis, Characterization, and Activity of Nitrogen Sites. Advanced Functional Materials (2022).
3. Beyond Nitrogen in the Oxygen Reduction Reaction on Nitrogen-Doped Carbons: A NEXAFS Investigation. Nanomaterials (2021).