Dual Active Centers Bridged by Oxygen Vacancies of Ruthenium Single‐Atom Hybrids Supported on Molybdenum Oxide for Photocatalytic Ammonia Synthesis
Haibo Yin, Zhen Chen, Yue Peng, Shangchao Xiong, Yadong Li, Hiromi Yamashita, Junhua Li
Abstract
Abstract Photocatalytic synthesis of ammonia (NH 3 ) holds significant potential compared with the Haber–Bosch process. However, the reported photocatalysts suffer from low efficiency owing to localized electron deficiency. Herein, Ru‐SA (single atoms)/H x MoO 3− y hybrids with abundant of Mo n + (4< n <6) species neighboring oxygen vacancies (O V ) are synthesized via a H‐spillover process. Detailed characterizations demonstrate that Ru‐SA/H x MoO 3− y hybrids can quantitatively produce NH 3 from N 2 and H 2 through the presence of dual active centers (Ru SA and Mo n + ). The Ru SA boost the activation and migration of H 2 , and Mo n + species act as the trapping sites of localized electrons and the adsorption and dissociation sites of N 2 , finally leading to NH 3 synthesis on Mo n + −OH. The NH 3 generation rate is up to 4.0 mmol h −1 g −1 , accompanied by an apparent quantum efficiency over 6.0 % at 650 nm.