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Electrochemical performance of Fe-Co bimetallic oxide composite as cathode for aqueous zinc-ion batteries
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DOI：10.1016/j.ijoes.2026.101318.png)
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Abstract
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The development of aqueous zinc-ion batteries is constrained by issues such as capacity decay and sluggish reaction kinetics of cathode materials. This study fabricated a Co3O4@Fe2O3 composite on carbon cloth via a twostep hydrothermal method. XPS analysis reveals a 0.2 eV negative shift in the Co 2p binding energy, suggesting electronic interaction between Co3O4 and Fe2O3; SEM and TEM images demonstrate uniform distribution of Fe2O3 particles on Co3O4 nanowires, with EDS mapping confirming overlapping spatial distributions of Fe, Co, and O elements. The Co3O4@Fe2O3/CC composite achieves a reversible specific capacity of 164.9 mAh/g at 1 A/g, exceeding that of pure Co3O4/CC (129.4 mAh/g). After 100 cycles at 0.1 A/g, the composite retains 67.6% of its capacity, exceeding the 59% retention of Co3O4/CC. In rate performance tests, the composite exhibits 87.8% capacity retention when the current density increases from 0.1 to 1 A/g, significantly higher than the 72.7% of Co3O4/CC. EIS analysis indicates a reduced charge transfer resistance, confirming improved reaction kinetics. This work provides insights into the design of polymetallic oxide composite cathodes.
Keywords:
Aqueous zinc-ion batteries
Cobalt-iron bimetallic oxide
Composite materials
Hydrothermal method
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