Sintesis Elektrokatalis Berbasis Fe/N-C untuk Oxygen Reduction Reaction (ORR)

Abstract

The development of M-N-C-based catalysts is an alternative to replace Pt-based catalysts for oxygen reduction reactions (ORR). In this study, Fe/N-C based catalysts with various additions of Fe were synthesized using FeCl3.6H2O, glycine, NH4Cl, and acetylene black (AB) by direct pyrolysis method followed by acid leaching. The results of the cyclic voltammetry (CV) test showed that NNCFe1 had the best catalytic performance against ORR with an onset potential value of 0.86 V vs RHE and an IORR of 4.48 μA at 0.7 V vs RHE. Raman Spectroscopy analysis shows that NNCFe1 has an ID/IG value of 1.37 which indicates that NNCFe1 has a disordered structure and a large number of defects. The addition of Fe may increase the catalytic performance of catalyst for ORR, but the addition of excessive Fe can allow the formation of aggregates and blockade on the active site of the catalyst and change the catalyst structure from disorder to graphitic. This is indicated by a decrease in the performance of the NNCFe20 catalyst against ORR which results in an onset potential value of 0.81 V vs RHE.