 A new type of binder-free HoloHolo TO2 at Co9S8 core branch arrays is developed as highly active OER and her electrocatalysts for stable overall water splitting. They show noticeable exceptional performance, with low overpotentials of 240 and 139 mV at 10 mA Cm-2 as well as low taffle slopes of 55 and 65 mV December 1 for OER slasher and alkaline medium. Impressively, the electrolysis cell based on the TO8 arrays as both cathode and anode exhibits a remarkably low water splitting voltage of 1.56 V and long-term durability with no decay after 10D. This article was authored by Shenzhua Deng, Yu Zhong, Yin Xiang Zeng, and others.