Cooperative Ni(Co)‐Ru‐P Sites Activate Dehydrogenation for Hydrazine Oxidation Assisting Self‐powered H<sub>2</sub> Production
Yanmin Hu, Tingting Chao, Yapeng Li, Peigen Liu, Tonghui Zhao, Ge Yu, Chen Cai, Xiao Liang, Huile Jin, Shuwen Niu, Wei Chen, Dingsheng Wang, Yadong Li
Abstract
Abstract Water electrolysis for H 2 production is restricted by the sluggish oxygen evolution reaction (OER). Using the thermodynamically more favorable hydrazine oxidation reaction (HzOR) to replace OER has attracted ever‐growing attention. Herein, we report a twisted NiCoP nanowire array immobilized with Ru single atoms (Ru 1 −NiCoP) as superior bifunctional electrocatalyst toward both HzOR and hydrogen evolution reaction (HER), realizing an ultralow working potential of −60 mV and overpotential of 32 mV for a current density of 10 mA cm −2 , respectively. Inspiringly, two‐electrode electrolyzer based on overall hydrazine splitting (OHzS) demonstrates outstanding activity with a record‐high current density of 522 mA cm −2 at cell voltage of 0.3 V. DFT calculations elucidate the cooperative Ni(Co)−Ru−P sites in Ru 1 −NiCoP optimize H* adsorption, and enhance adsorption of *N 2 H 2 to significantly lower the energy barrier for hydrazine dehydrogenation. Moreover, a self‐powered H 2 production system utilizing OHzS device driven by direct hydrazine fuel cell (DHzFC) achieve a satisfactory rate of 24.0 mol h −1 m −2 .