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

- Especial porous FeSe2@Ti nanomesh arrays are synthesized for HER.
- FeSe2 is tightly stuck on the titanium plate, beneficial for stability.
- The hierarchical porous structure can provide large specific surface area.
- The hierarchical porous structure accelerate electrolyte penetration.
- The material exhibits a superior electrochemical performance.

Commonly, novel morphology can obviously lead to superior performance. Herein, we have firstly synthesized porous FeSe2 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 FeSe2 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 H2SO4 solution.

We firstly report unique porous FeSe2@Ti nanomesh arrays, which exhibit high-efficiency HER activities.186