Single‐Atom Mo with High Oxophilicity Anchored Ru Clusters for Practical Anion‐Exchange‐Membrane Water Electrolyzer
Shuhuan Han, Xiaojie Wang, Jun Bao, Qinghe Yang, Xiaofei Zeng, Dapeng Cao
Abstract
Abstract Developing efficient electrolytic water catalysts with long‐term stability at high current densities is still a challenge for their large‐scale application. Herein, a hydrogen evolution reaction (HER) electrocatalyst with Mo single atom interfaced with Ru atomic clusters loaded on N‐doped hollow carbon spheres (Ru‐MoN 4 ‐NC) is constructed. The strong metal‐support interaction (MSI) between Ru clusters and NC carrier is achieved through the formation of Ru‐Mo and Mo─N bonds, which inhibit the shedding and agglomeration of Ru atoms, contributing to the obvious improvement of the electrocatalytic stability. Furthermore, the oxyphilic MoN 4 sites facilitate the adsorption of hydroxyl species, promoting the dissociation of water and thereby boosting the HER activity. Ru‐MoN 4 ‐NC as a cathode catalyst in anion‐exchange membrane water electrolyzer (AEMWE) has excellent stability (1200 h) at the industrial‐grade current density of 1 A cm −2 with a low cell voltage (1.72 V). Simultaneously, it exhibits excellent alkaline HER activity with a low overpotential (8 mV @10 mA cm −2 , 138 mV @1 A cm −2 ) and high mass activity (7.5 A mg @50 mV).