Developing an active, durable and cost-effective air cathode catalyst is critical for commercializing proton exchange membrane fuel cells (PEMFCs). CeO2 was reported as a scavenger of harmful peroxide by-products, yet...
A composite
electrocatalyst of NiFe2O4 supported
on a 2H/1T multiphase MoS2 nanosheet is reported. The as-prepared
NiFe2O4/MoS2 heterostructured composite
exhibited an excellent bifunctional oxygen reduction reaction (ORR)
and oxygen evolution reaction (OER) activity. The composite electrocatalyst
exhibited an OER current density of 10 mA cm–2 with
an overpotential of 330 mV in 1 M KOH comparable to that of IrO2. On the other hand, the composite electrocatalyst exhibited
an ORR onset potential (E
onset) of 0.82
V vs RHE. The K–L plot and rotating ring-disk electrode analysis
evidenced that the ORR on the NiFe2O4/MoS2 heterostructure follows closely the 4 e– transfer process similar to Pt/C and delivered notable electrochemical
stability after 5000 potential cycles with retention of about 90%
diffusion-limiting current density. The H2–O2 anion exchange membrane fuel cell (AEMFC) employing the cathode
electrode fabricated with the NiFe2O4/MoS2 composite showed a peak power density of ∼20 mW cm–2. In contrast, a peak power density of ∼51
mW cm–2 was realized for the AEMFC employing the
Pt/C cathode electrode under identical operating conditions. Considering
the excellent bifunctional activity, good electrochemical performance
and stability, and the low-cost facile synthetic approach, the NiFe2O4/MoS2 heterostructured composite developed
in this study can be considered as a potential candidate for energy
conversion and storage applications.
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