Pauling‐Type Multi‐Oxygen Adsorption of Amorphous MoS _x Cocatalysts for Boosting Photocatalytic H ₂ O ₂ Production

ABSTRACT The loading of cocatalysts and the modulation of their electronic properties play a crucial role in boosting photocatalytic H 2 O 2 production. However, cocatalyst surfaces often feature multi‐oxygen adsorption configurations, and how such adsorption states influence charge migration and interfacial reactions remains largely unexplored. Herein, we constructed an amorphous MoS x cocatalyst with multiple active sites on CdS photocatalysts (a‐MoS x /CdS), and systematically investigated the effects of multi‐oxygen adsorption on ultrafast interfacial charge transfer and interfacial reaction kinetics. Experimental results demonstrate that the optimized a‐MoS x /CdS exhibits an excellent H 2 O 2 yield of 2.94 mmol g −1 h −1 , which is 2.04 and 1.6 times higher than that of pristine CdS and crystalline c‐MoS 2 /CdS, respectively. Combined evidence from electron paramagnetic resonance (EPR), in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), and O 2 temperature‐programmed desorption (O 2 ‐TPD) confirms that the abundant Mo active sites on the amorphous MoS x surface induce the formation of a Pauling‐type multi‐oxygen adsorption configuration. Furthermore, femtosecond transient absorption spectroscopy (fs‐TAS) confirms that this multi‐oxygen adsorption mechanism effectively facilitates the ultrafast interfacial migration of photogenerated electrons, substantially accelerating the interfacial reaction process. This study elucidates the intrinsic mechanism of multi‐site adsorption in photocatalysis and opens up a new avenue for constructing high‐performance photocatalytic systems.