Abstract
A dual-confinement strategy was developed to design efficient electrocatalysts for oxygen evolution reaction (OER). NiCo alloy nanoparticles (NPs) were synthesized and embedded in N-doped carbon fibers (NCF) by electrospinning and carbonization techniques. Dual effects of size confinement by the metal–organic frameworks (MOFs) derived carbon skeleton companied with spatial confinement by polyacrylonitrile (PAN) derived carbon fibers (CFs) for the NiCo NPs were executed to improve the electrocatalytic activity. In an alkaline solution, the prepared NiCo-C@CF exhibits significant advantages over the commercial RuO2 catalyst i.e., a 61 mV lower overpotential of 363 mV under 50 mA cm−2, and excellent durability of 87.5 % current density retention after 60 h of continuous OER polarization.
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