Nickel-based MOF derived Ni @ NiO/N–C nanowires with core-shell structure for oxygen evolution reaction

Nickel-based metal organic framework materials were first prepared by hydrothermal method and used as the precursor. Ni/nitrogen-carbon (Ni–N–C), Ni@NiO–N–C and NiO–N–C mixtures derived from metal organic skeleton were successfully prepared by controlling the heat treatment conditions and applied in the electrocatalytic oxygen evolution reaction (OER). Through a series of research of OER catalytic performance, OER process kinetics, and stability, the as-prepared Ni @ NiO/N–C nanowires (NW) (250 °C) with core-shell structure showed the most prominent activity. Compared with other derived mixed materials, the oxygen evolution overpotential was 390 mV at the current density of 10 mA cm−2, and the Tafel slope was 100 mV dec−1. Moreover, the material showed excellent stability without significant decrease of activity after a long time of testing. The detail study regarding the formation and evolution of Ni/NiO NWs is of considerable value and may offer prospects for developing highly active electrocatalysts in electrochemical energy devices. Nickel-based metal organic framework (Ni-MOF) materials were prepared by hydrothermal method and used as the precursor. Ni/nitrogen-carbon nanowires (Ni/N–C NW), Ni@NiO/N–C NW and NiO/N–C NW hybrid materials derived from metal organic framework were successfully prepared by controlling the heat treatment conditions and applied in the electrocatalytic OER. Through the research, the preparation of core-shell structure composite Ni@NiO/N–C nanowires (Ni@NiO/N–C NW) (250 °C) showed the activity of the most prominent. [Display omitted] •Ni–N–C, Ni@NiO–N–C and NiO–N–C mixtures derived from MOF were successfully prepared.•Ni @ NiO/N–C nanowires (NW) (250 °C) with core-shell structure showed the most prominent activity.•The oxygen evolution overpotential of Ni @ NiO/N–C nanowires (NW) (250 °C) was 390 mV.•Tafel slope Ni @ NiO/N–C nanowires (NW) (250 °C) was 100 mV dec−1 at the current density of 10 mA cm−2.