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Durai, Lignesh; Badhulika, Sushmee
Fuel (Guildford), 11/2023, Letnik: 352Journal Article
Display omitted •First report on improved electrocatalytic activity of Ni nano-pebbles decorated Fe3C nanosheets.•Ni@FC/SPCE electrode for direct alcohol fuel cell application (alcohol = methanol, ethanol, and ethylene glycol).•Exhibited high mass activity with good anti-CO tolerance and cyclic stability.•Excellent capacity retention after 10000 s of chronoamperometry. In this work, we report the solid-state reaction-assisted synthesis of the iron-based MAX phase compound (Fe3AlC2 MAX; where M- metal, A- aluminum, and X- carbide), which is solvothermal etched and exfoliated to yield 2D iron (Fe)-MXene. The nanosheet-like morphology of the Fe-MXene is confirmed via TEM and SEM analysis. The 2D Fe-MXene nanosheets are further decorated with nickel (Ni) nano pebbles through the simple electrodeposition technique on a screen-printed carbon electrode (Ni@FC/SPCE). The electrode displays a peak mass activity of 525.5, 742.8, and 910.2 mA/mg for methanol oxidation reaction (MOR), ethanol oxidation reaction (EOR), and ethylene–glycol oxidation reaction (EgOR), respectively. The Ni nano pebbles have excellent electrocatalytic activity owing to their multiple oxidation states (Ni2+/Ni3+) and catalytic active sites which enhance the alcohol oxidation reaction while the metallic sites of the Fe3C2 nanosheets contribute to high electrical conductivity and stability of the electrode. The as-fabricated Ni@FC/SPCE electrode exhibits high stability with outstanding capacity retention of ∼ 88%, ∼95%, and ∼ 75% for MOR, EOR, and EgOR after 10000 s of chronoamperometry analysis. This performance of the Ni@FC/SPCE as a non-noble, cost-effective, and stable nano-catalyst with excellent anti-carbon monoxide (anti-CO) poisoning properties proves it an ideal platform for DAFC applications.
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