TY - JOUR
T1 - Quantum chemistry of the oxygen reduction reaction (ORR) on Fe-G iron doped graphene for fuel cells
AU - López-Chávez, Ernesto
AU - Garcia-Quiroz, Alberto
AU - Jiménez-González, Lucy J.
AU - Díaz-Góngora, José A.I.
AU - Peña-Castañeda, Yesica A.
N1 - Publisher Copyright:
© 2018 Hydrogen Energy Publications LLC
PY - 2019/5/9
Y1 - 2019/5/9
N2 - In this work, we used a dissociative mechanism to perform calculations based on Density Functional Theory, DFT, and electronic structure in order to study the oxygen reduction reaction on graphene doped with iron. The model takes into account some of the operating conditions of a proton exchange membrane fuel cell such as the equilibrium of hydrogen oxidation reaction, electrode potential of 1.23 V and 0 V, solvation effects, and corrections to the energy at the zero point (ZPE) and the entropic one. However, in this approach, we neglect the effects on the free energy of the interaction of the adsorbed species with the electric field due to the double electrochemical layer, the pH of the acid medium, and the oxygen coverage. The free energy diagrams for different intermediate steps of the oxygen reduction reaction, ORR, the oxygen adsorption energy on sites close to those occupied by the Fe-atoms, as well as the activity calculations indicated that Fe-Graphene (Fe-G) system, may possess catalytic properties close to either Pt, as catalyst, as its alloys since they can favor the ORR in a fuel cell proton exchange membrane. The results have been compared with other theoretical studies which use graphene as a central element as will be established in the present manuscript.
AB - In this work, we used a dissociative mechanism to perform calculations based on Density Functional Theory, DFT, and electronic structure in order to study the oxygen reduction reaction on graphene doped with iron. The model takes into account some of the operating conditions of a proton exchange membrane fuel cell such as the equilibrium of hydrogen oxidation reaction, electrode potential of 1.23 V and 0 V, solvation effects, and corrections to the energy at the zero point (ZPE) and the entropic one. However, in this approach, we neglect the effects on the free energy of the interaction of the adsorbed species with the electric field due to the double electrochemical layer, the pH of the acid medium, and the oxygen coverage. The free energy diagrams for different intermediate steps of the oxygen reduction reaction, ORR, the oxygen adsorption energy on sites close to those occupied by the Fe-atoms, as well as the activity calculations indicated that Fe-Graphene (Fe-G) system, may possess catalytic properties close to either Pt, as catalyst, as its alloys since they can favor the ORR in a fuel cell proton exchange membrane. The results have been compared with other theoretical studies which use graphene as a central element as will be established in the present manuscript.
KW - DFT molecular simulation ab-initio
KW - Free energy profiles for ORR
KW - ORR
KW - Oxygen reduction reaction phenomena
UR - http://www.scopus.com/inward/record.url?scp=85054169820&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2018.09.062
DO - 10.1016/j.ijhydene.2018.09.062
M3 - Artículo
SN - 0360-3199
SP - 12439
EP - 12445
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
ER -