Porous TiFe₂ intermetallic compound fabricated via elemental powder reactive synthesis

Abstract

Porous intermetallics show potential in the field of filtration and separation as well as in the field of catalysis. Herein, porous TiFe₂ intermetallics were fabricated by the reactive synthesis of elemental powders. The phase transformation and pore formation of porous TiFe₂ intermetallics were investigated, and its corrosion behavior and hydrogen evolution reaction (HER) performance in alkali solution were studied. Porous TiFe₂ intermetallics with porosity in the range of 34.4%–56.4% were synthesized by the diffusion reaction of Ti and Fe elements, and the pore formation of porous TiFe₂ intermetallic compound is the result of a combination of the bridging effect and the Kirkendall effect. The porous TiFe₂ samples exhibit better corrosion resistance compared with porous 316L stainless steel, which is related to the formation of uniform nanosheets on the surface that hinder further corrosion, and porous TiFe₂ electrode shows the overpotential of 220.6 and 295.6 mV at 10 and 100 mA·cm⁻², suggesting a good catalytic performance. The synthesized porous Fe-based intermetallic has a controllable pore structure as well as excellent corrosion resistance, showing its potential in the field of filtration and separation.

Keywords

TiFe₂ intermetallic compound / porous materials / reactive synthesis / corrosion behavior / hydrogen evolution reaction

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