Fe-Ni3S2 nanoneedles on Ni foam as a Bifunctional Electrocatalyst for Hydrogen

초록

Electrocatalytic water splitting is a widely considered as environmentally friendly technology for the extremely pure hydrogen production. Exploring highly efficient, cost?effective, and stable bifunctional electrocatalysts is beneficial for improving the performance of overall water splitting. In this study, Fe-doped Ni3S2 nanoneedles directly grown on Ni foam were successfully via two-step processes including hydrothermal reaction and sulfidation method and applied to electrocatalysts for both hydrogen and oxygen evolution reaction. Among the samples, the Fe-doped Ni3S2 on Ni foam indicated the best electrochemical performance as a bifunctional electrocatalyst for both OER and HER. Furthermore, when the as-obtained Fe-doped Ni3S2 is used as a bifunctional electrocatalyst in an overall water splitting system, a low cell voltage of 1.59 V is required to obtain a current density of 10 mA cm?2 with outstanding long-term stability.