RT Journal Article
T1 Highly active Fe-N-reduced graphene oxide electrocatalysts using sustainable amino acids as nitrogen source.
A1 Rayej, Heresh
A1 Reza Vaezi, Mohammad
A1 Aghabarari, Behzad
A1 Ruiz-Rosas, Ramiro Rafael
A1 Rosas-Martínez, Juana María
A1 Rodríguez-Mirasol, José
A1 Cordero-Alcántara, Tomás
K1 Catálisis
K1 Pirólisis
K1 Grafeno
K1 Hierro
K1 Aminoácidos
AB This work reports the preparation of oxygen reduction reaction catalysts by pyrolysis of a mixture of Fe(NO3)3 and graphene oxide (GO) functionalized with three different amino acids, Arginine (Arg), Cysteine (Cys), Histidine (His). The combination of TPD, FTIR and XPS revealed that the functionalization of GO rendered a reduction of epoxide and carboxyl surface groups at along with the preferential generation of amide bridges. XPS confirmed the incorporation of nitrogen in edge and quaternary positions of the graphene layers after the pyrolysis at 800 °C of the amino acid functionalized GO mainly in form of pyridines (Arg), pyrroles (Cys) and quaternary nitrogen (His). XRD and XPS showed that most iron is retained after pyrolysis in the form of crystalline Fe3O4 and in a lesser extend as Fe2O3. The amount, distribution, and particle size of iron species on the pyrolyzed samples relies on the amino acid used for the modification, with histidine rendering the lower retained amount and higher dispersion. Raman analyses pointed out that the structural order seems to follow the order His > Cys > Arg. The electrochemical characterization revealed that, in spite of having a lower iron content, Fe-rGO-His shows a higher double layer capacitance, improved conductivity and enhanced ORR activity than their counterparts, delivering onset and half-wave potentials only 30 mV behind the current state-of-the-art platinum–carbon black catalyst. These results confirm that amino acids, and specially Histidine, can be interesting N-dopant agents for the preparation of nitrogen-iron graphene electrocatalysts with excellent ORR activities.
PB Elsevier
YR 2021
FD 2021-12-15
LK https://hdl.handle.net/10630/40536
UL https://hdl.handle.net/10630/40536
LA eng
NO Fuel 313 (2022) 122985
NO MICINN
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026