Oxygen evolution reaction (OER) is a significant reaction in metal-air battery and water splitting. Commonly, noble metals, which are expensive and less stable, have been used as catalysts for OER due to their high catalytic activity. To replace the noble metal catalyst, 3d transition metal-based materials, which are relatively inexpensive and have adequate catalytic activity, have been widely studied as promising candidates for OER catalysts. However, their moderate OER performance presents an obstacle for practical application. The introduction of oxygen vacancies is an effective way to tune the various properties of catalysts, which, in turn, can enhance the catalytic activity. Here, we manufacture cobalt-based catalysts with high ratios of oxygen vacancy from metal-organic framework (MOF) materials. Depending on the amount of treated-hexamethylenetetramine (HMT), the cobalt-based catalysts exhibit various morphologies, compositions, and ratios of oxygen vacancy. The optimal cobalt-based catalyst (300-h/Co/CC) shows significantly enhanced OER performance with a low overpotential of 280 mV at current density of 10 mA cm⁻². This work presents a new approach to synthesize catalysts with high ratios of oxygen vacancy from MOF.

氧气析出反应（OER）是金属-空气电池和水分解中的重要反应。通常，昂贵且不稳定的贵金属由于其高催化活性而已被用作OER的催化剂。为了代替贵金属催化剂，已经相对地便宜并且具有足够的催化活性的基于3d过渡金属的材料已经被广泛用作OER催化剂的有希望的候选者。但是，它们适度的OER性能为实际应用带来了障碍。引入氧空位是调节催化剂各种性能的有效方法，从而可以提高催化活性。在这里，我们使用金属有机骨架（MOF）材料制造具有高氧气空位比例的钴基催化剂。取决于处理的六亚甲基四胺（HMT）的量，钴基催化剂表现出各种形态，组成和氧空位比。最佳的钴基催化剂（300-h / Co / CC）显示出显着增强的OER性能，在10 mA cm的电流密度下具有280 mV的低过电势⁻²。这项工作提出了一种新的方法来合成MOF中具有高比例的氧空位的催化剂。