We have synthesized ferromagnetic Heusler alloy Ni2FeGa using the melt-spinning technique. The Ni2FeGa ribbon, having a high chemical ordering L21 structure, exhibits a thermoelastic martensitic transformation from cubic to orthorhombic structure at 142 K and a premartensitic transformation. The alloy has a relatively high Curie temperature of 430 K, a magnetization of 73 Am2/kg, and a low saturated field of 0.6 T. The textured samples with preferentially oriented grains show a completely recoverable two-way shape memory effect with a strain of 0.3% upon the thermoelastic martensitic transformation.
The
development of efficient and low-cost hydrogen evolution reaction
electrocatalysts has been regarded as a promising approach to produce
sustainable and clean fuels to solve the energy crisis and environmental
problems. Herein, 3D hybrid Cu3P–Ni2P
hexagonal nanosheet arrays are successfully prepared on nickel foam
(Cu3P–Ni2P/NF). Benefiting from synergistic
effects and strong chemical coupling existing at the interface, the
Cu3P–Ni2P/NF electrode exhibits a low
overpotential of 103 mV at a current density of 10 mA cm–2, which is 47 and 100 mV less than that for Ni2P/NF and
Cu3P/NF, respectively. It also shows excellent electrochemical
durability for long-term reaction in alkaline medium. The excellent
electrocatalytic activity makes the Cu3P–Ni2P/NF as a promising cathode toward efficient hydrogen evolution
via electrochemical water splitting.
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