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Updated: Feb 16, 2026

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
Published on: September 22, 2015
Theoretical insights on the oxygen-reduction reaction mechanism of LaN4-embedded graphene
Xiaoxu Sun1,2, Kai Li1, Cong Yin3
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, People's Republic of China.
Abstract:
We studied the structural stability, adsorption behavior of the key intermediates in the oxygen-reduction reaction (ORR) process, and ORR mechanism on LaN4-embedded graphene (LaN4-Gra) theoretically in an acid environment. The geometry optimization and energy calculations in this study were performed using the generalized gradient approximation (GGA) within the Perdew-Burke-Ernzerhof (PBE) functional. The thermodynamic stability of LaN4-Gra is confirmed by its negative formation energy. The sequential hydrogenation of O2 to generate H2O molecules is the most favorable pathway and it is a four-electron process. The last hydrogenation of OH species to form H2O molecules is the rate-determining step in the whole ORR process. Compared with the energy barrier of pure Pt electrocatalyst (0.8 eV), the close energy barrier value for LaN4-Gra (0.89 eV) is quite favorable. This implies that LaN4-embedded graphene could be a potential ORR catalyst. Finally, the ORR free energy of LaN4-Gra electrocatalyst was also analyzed.
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