Water electrolysis is an efficient approach for high-purity hydrogen production. However, the anodic sluggish oxygen evolution reaction (OER) always needs high overpotential and thus brings about superfluous electricity cost of water electrolysis. Therefore, exploiting highly efficient OER electrocatalysts with small overpotential especially at high current density will undoubtedly boost the development of industrial water electrolysis. Herein, we used a simple hydrothermal method to prepare a novel FeOOH–CoS nanocomposite on nickel foam (NF). The as-prepared FeOOH–CoS/NF catalyst displays an excellent OER performance with extremely low overpotentials of 306 and 329 mV at 500 and 1000 mA cm⁻² in 1.0 M KOH, respectively. In addition, the FeOOH–CoS/NF catalyst can maintain excellent catalytic stability for more than 50 h, and the OER catalytic activity shows almost no attenuation no matter after 1000 repeated CV cycles or 50 h of stability test. The high catalytic activity and stability have exceeded most non-noble metal electrocatalysts reported in literature, which makes the FeOOH–CoS/NF composite catalyst have promising applications in the industrial water electrolysis.

水电解是生产高纯氢气的有效方法。然而，阳极迟缓析氧反应（OER）总是需要高过电位，从而带来水电解的多余电力成本。因此，开发具有小过电位特别是高电流密度的高效OER电催化剂无疑将推动工业水电解的发展。在此，我们使用简单的水热法在泡沫镍 (NF) 上制备了新型 FeOOH-CoS 纳米复合材料。所制备的 FeOOH-CoS/NF 催化剂表现出优异的 OER 性能，在 500 和 1000 mA cm ^{-2 下}具有 306 和 329 mV 的极低过电位分别在 1.0 M KOH 中。此外，FeOOH-CoS/NF 催化剂可以保持优异的催化稳定性超过 50 小时，并且无论经过 1000 次重复 CV 循环或 50 小时的稳定性测试，OER 催化活性几乎没有衰减。FeOOH-CoS/NF复合催化剂的高催化活性和稳定性超过了文献报道的大多数非贵金属电催化剂，这使得FeOOH-CoS/NF复合催化剂在工业水电解中具有广阔的应用前景。