 This research has developed a new type of single-atom catalyst, SAC, which is more efficient than existing sacs for the oxygen-evolution reaction, OR. The sacs are made from nickel atoms bonded to oxygen sites on graphene-like carbon, resulting in a three-dimensional porous structure. This structure allows for better electro-catalytic activity and stability compared to other sacs. Furthermore, the catalyst exhibit excellent performance with a low over potential of 224 mV at a current density of 10 mAcM2, a taffel slope of 42 mDec1, an oxygen production turnover frequency of 1.44 s1 at 300 mV, and a long-term durability without significant degradation even under extreme conditions. These results show that the bonding between single-nickel and oxygen sites can significantly improve the performance of the sacs. This article was authored by Yagwan Lee, Jum Shui Wu, Peng Feilu, and others.