Iron corrosion is always harmful to our industrial manufacture and thus numerous effects have been conducted for corrosion protection. However, the detrimental corrosion may be applied to produce serviceable materials, resulting in “upcycling waste into wealth”. Herein, a novel corrosion engineering is employed to fabricate hierarchical iron rusts/Ni(OH)₂ nanosheet-on-microsphere arrays as effective oxygen evolution reaction (OER) electrocatalysts. Through physically mixing the fabricated ultrathin iron rusts with Ni(OH)₂ microspheres, the as-prepared catalyst requires an overpotential of only 318 mV to achieve the current density of 20 mA cm⁻². Besides, negligible increasement of overpotential is observed after continuous chronopotentiometric determination for 30 h. The excellent OER property is attributed to the formed oxygen bridges of Fe–O–Ni on the solid-solid contact sites, which promote oxidation of Ni²⁺ specieses via the interfacial Fe³⁺ of iron rusts (FeOOH). In particular, a large-scale production of 2.968 g iron rusts/Ni(OH)₂ catalysts was successfully prepared by using this simple, lowcost yet valid corrosion engineering. This work provides a novel avenue towards large-scale production of efficient OER catalysts by combing with corrosion science, which is beneficial for boosting the progress of water splitting.

铁腐蚀始终对我们的工业生产有害，因此已经采取了多种措施来保护腐蚀。但是，有害的腐蚀可能会被用于生产可使用的材料，从而导致“废物回收再造为财富”。在这里，一种新颖的腐蚀工程被用来制造分层的铁锈/ Ni（OH）₂纳米片-微球阵列作为有效的析氧反应（OER）电催化剂。通过将制造的超薄铁锈与Ni（OH）₂微球物理混合，制得的催化剂仅需318 mV的超电势即可实现20 mA cm ^-2的电流密度。此外，连续计时电位法测定30小时后，观察到的过电位增加可忽略不计。出色的OER性能归因于在固-固接触点上形成的Fe–O–Ni氧桥，该氧桥通过铁锈（FeOOH）的界面Fe ³⁺促进了Ni ²⁺物种的氧化。特别地，通过使用这种简单，低成本但有效的腐蚀工程，成功地大规模制备了2.968 g铁锈/ Ni（OH）₂催化剂。这项工作与腐蚀科学相结合，为大规模生产高效OER催化剂提供了一条新途径，这有利于促进水分解的进程。