MOF-Derived Zn-Doped CoSe as an Efficient and Stable Free-Standing Catalyst for Oxygen Evolution Reaction.

Developing highly active electrocatalysts with low cost and high efficiency for oxygen evolution reactions (OER) is important for the practical implementations of hydrogen energy. Here, we report a Zn-doped CoSe nanosheets grown on free-standing carbon fabric collector (CFC), which was synthesized by using a metal-organic framework (MOF) as precursor and followed by a selenylation process. Importantly, the Zn-doped CoSe/CFC electrode exhibited an obviously enhanced catalytic activity for OER in 1 M KOH aqueous solution compared with CoSe/CFC, showing a small overpotential of 356 mV for a current density of 10 mA cm, a small Tafel slope of 88 mV dec, and an excellent stability. The robust and free-standing electrode shows great potential as an economic catalyst for OER applications.