In recent years, the design of high-performance and low-cost electrocatalysts for oxygen evolution reaction (OER) has captured great interest in the field of energy conversion and storage. Layered double hydroxide (LDH) with special configuration usually shows a highly electrochemical activity and become a desirable functional material for OER. In this work, carbon nanofibers embedded with Co nanoparticles have been prepared via an electrospinning and carbonization process, which can be served as a conductive support for the growth of NiFe LDH nanosheets through an electrodeposition route to produce a hierarchical 3D structure (denoted as 3D core-shell Co-C@NiFe LDH nanofibers). Owing to the high conductivity, large surface area and strong electron transfer between NiFe LDH nanosheets and Co-C nanofibers, the as-prepared 3D core-shell Co-C@NiFe LDH nanofibrous catalyst shows an excellent OER performance with an overpotential of only 249 mV at the current density of 10 mA cm⁻² and a small Tafel slope of 57.9 mV dec⁻¹, demonstrating an outstanding electrocatalytic activity for water oxidation. Furthermore, the 3D core-shell Co-C@NiFe LDH nanofibers also exhibit a superior long-term stability, with no obvious decrease in current density after nearly 190 h testing. Hence, the low-cost 3D core-shell Co-C@NiFe LDH nanofibrous electrocatalyst with an outstanding OER performance offers a novel chance for practical electrochemical water splitting application.

近年来，用于氧气析出反应（OER）的高性能，低成本电催化剂的设计引起了能量转换和存储领域的极大兴趣。具有特殊构型的层状双氢氧化物（LDH）通常显示出很高的电化学活性，并成为OER的理想功能材料。在这项工作中，通过电纺和碳化工艺制备了嵌入Co纳米粒子的碳纳米纤维，该碳纳米纤维可以作为电支撑途径，通过电沉积途径来生长NiFe LDH纳米片，以产生分层的3D结构（表示为3D核）。 -壳Co-C @ NiFe LDH纳米纤维）。由于NiFe LDH纳米片和Co-C纳米纤维之间的高电导率，大表面积和强电子转移，^-2和57.9 mV dec ^-1的小Tafel斜率，证明了其对水氧化的出色电催化活性。此外，3D核-壳Co-C @ NiFe LDH纳米纤维还表现出优异的长期稳定性，经过近190小时的测试后电流密度没有明显下降。因此，具有出色的OER性能的低成本3D核壳型Co-C @ NiFe LDH纳米纤维电催化剂为实际的电化学水分解应用提供了新的机会。