Facile fabrication of robust 3D Fe-NiSe nanowires supported on nickel foam as a highly efficient, durable oxygen evolution catalystElectronic supplementary information (ESI) available: Polarization curves and the corresponding Tafel plots of Fe-NiSe/NF prepared with different Ni/Fe ratios. SEM of the NF substrate, and Fe-NiSe/NF, NiSe/NF and post-OER Fe-NiSe/NF electrodes. XRD of the as-prepared and post-OER Fe-NiSe/NF. XPS spectrum of Fe-NiSe/NF and the post-OER Fe-NiSe/NF. See DOI: 10.1039/c7t

Electrochemical hydrogen production through water splitting is one of the most promising methods for the storage and utilization of renewable energy. However, it is hindered by the sluggish oxygen evolution reaction (OER). Therefore, there is an urgent need to develop an efficient and robust OER catalyst through a simple and low-cost method. Herein, we report the in situ fabrication of amorphous Fe-NiSe/NF without a polymeric binder as a three-dimensional (3D) nanowire electrode for efficient water oxidation. It shows good durability in 1 M KOH. This catalyst requires overpotentials of only 233 and 275 mV to drive current densities of 10 and 100 mA cm −2 , and it shows a low Tafel slope of 48 mV dec −1 . The faradaic efficiency of Fe-NiSe/NF for oxygen evolution was determined to be close to 96.8%. Robust 3D nanostructured Fe-NiSe/NF as a highly efficient, durable oxygen evolution catalyst is fabricated by a simple dipping method.