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

• DOI: 10.1016/j.electacta.2019.134814
• Publication Date: 2019-09-12T15:32:41Z
• Authors: Aijuan Xie; Jie Zhang; Xiang Tao; Jianghui Zhang; Bingyan Wei; Wenhao Peng; Yuwei Tao; Shiping Luo
• Keywords: Overpotential; Oxygen evolution; Non-blocking I/O

Abstract 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.