Rui Chen,Na Wang,Yiwen Xie,Yayun Hu,Yuxia Song,Rong Wang
Photocatalytic inactivation, emerging as a novel bactericidal technique, is gaining increasing attention. While oxygen vacancies (OVs) and heterogeneous junction structures have been extensively investigated to enhance photocatalytic performance, the synergistic effect between the two remains largely unexplored. In this study, a Bi 2 S 3 @BiOCl-OV heterojunction structure enriched with oxygen vacancies as a promising photocatalyst was developed. Bi 2 S 3 @BiOCl-OV effectively improved photocatalytic properties due to the presence of oxygen vacancies and the unique structure of Z-type heterojunction. Further mechanism investigation shows that the unique heterojunction structure can induce the formation of internal electric field, the existence of oxygen vacancies can promote the generation of micro local electric field, and effectively promote the charge redistribution under the action of dual-electric field. Simultaneously, O 2 and H 2 O in the system are adsorbed by oxygen vacancies, and are activated by electrons to form the reactive oxygen species, thereby achieving the goal of killing microorganisms.
Feng Xie,Shaoqi Zhan,Zihan You,Jiao Lan,Linghu Meng,Wei Zheng,Yuanguo Chen,Ming Peng,Yongwen Tan
Electrochemical reduction of CO 2 , a technology with great potential for renewable energy storage and climate change mitigation, depends on critical C─C coupling steps in CO 2 RR to ensure efficient high-value hydrocarbon production. In this work, a local interface electric field and a tip-induced electric field are constructed on Ag-embedded Cu nanoneedle arrays to enhance the concentration of the *CO intermediate and regulate the adsorption of key intermediates, respectively. This optimization of the reaction microenvironment promotes the deep reduction of the *CO intermediate into multi-carbon products (C 2+ ), with a faradaic efficiency of 83.7% and a C 2+ local current density of −526 mA cm −2 within gas-fed flow cells. Experimental evidence and simulations validate that the interface electric field of the Cu-Ag bimetallic catalyst increased surface *CO coverage, substantially lowering the formation barrier for *CHO intermediate, and the tip-induced electric field that can stabilize *CO intermediate and suppress hydrogen evolution, promoting the C─C coupling process. The formation of the dual electric fields profoundly induced local environments and ultimately, the dominant C 2+ product, which offers significant design guidelines for adjusting the supply and demand balance of reaction intermediates.
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