Controlled Synthesis of Unique Porous FeSe2 Nanomesh Arrays towards Efficient Hydrogen Evolution Reaction

Abstract Commonly, novel morphology can obviously lead to superior performance. Herein, we have firstly synthesized porous FeSe 2 nanomesh arrays grown on titanium foil, which exhibit remarkable performance during hydrogen evolution reaction (HER). Our sample is fabricated via a general wet-chemical process and then one-step calcination. It is worth noting that the FeSe 2 is tightly stuck on the surface of titanium plate, which could result in enhanced stability in the long-time operation for HER. Moreover, the porous structure could provide large specific surface area and probably more active sites for electrolysis. Based on the above advantages, the as-synthesized material shows a low overpotential of 175 mV at 10 mA cm −2 and excellent stability with 4% increase in overpotential under a constant current density of 10 mA cm −2 for 24 h in 0.5 M H 2 SO 4 solution.