Graphene‐Like Nitrogen‐Doped Carbon Nanosheet Prepared from Direct Calcination of Dopamine Confined by g‐C₃N₄ for Oxygen Reduction

Abstract

Abstract2D carbon nanosheet provides an attractive prospect in the field of electrochemical catalysis, and how to prepare atomic level 2D carbon nanosheet with good electrochemical performance by an easy and efficient method is still a big challenge. Herein, graphene‐like N‐doped carbon nanosheet with the thickness of 0.6–2 nm is prepared by one‐step and solvent‐free method of pyrolyzing dopamine (DA) confined by graphitic carbon nitride (g‐C3N4). Pyrocondensation polymerization of DA within the interlayers of g‐C3N4 to form N‐doped benzene‐fused ring structures at high temperature is reported, and DA‐derived graphene‐like carbon nanosheet at 1000 °C exhibits an excellent oxygen reduction reaction activity in alkaline environment and pronounced catalytic activity in acidic medium. It can further improve the practical application of DA‐based carbon materials.

Secondary-Atom-Doping Enables Robust Fe–N–C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

“…2 b). The intensity ratio of D to G band ( I D / I G ) manifests the degree of graphitization of carbon materials [ 44 ]. Among the as-synthesized catalysts, the I D / I G (1.25) of Fe–N–C/FeN is higher than those of Fe–N–C (0.86), Fe–N–C/control (1.05) and Fe–N–C/N (1.06).…”

Quenching-Induced Structural Distortion of Graphitic Carbon Nitride Nanostructures: Enhanced Photocatalytic Activity and Electrochemical Hydrogen Production

“…The change in relative intensity suggested that the N 2 -cooled g-C 3 N 4 has crystal distraction in its structure. 57…”

Importance of Electrocatalyst Morphology for the Oxygen Reduction Reaction

“…The nitrogen-carbon (NÀ C) materials were also reported and used as ORR catalysts. [55][56][57][58][59][60][61][62][63] Herein, we focus on the MÀ NÀ C based electrocatalysts. From the point view of morphology, these MÀ NÀ C electrocatalysts are composed of one-dimensional (1D), twodimensional (2D), three-dimensional (3D) and multi-dimensional (MD) materials.…”

“…Figure c shows a typical molecular structure of a M−N−C catalyst with metal atom coordinated on N‐doped carbon material. The nitrogen‐carbon (N−C) materials were also reported and used as ORR catalysts . Herein, we focus on the M−N−C based electrocatalysts.…”