Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 307, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121214
Keywords
Microbial electrosynthesis; Photocatalysis; Charge transfer switching; Oxygen vacancy; Pyrrolic nitrogen
Funding
- National Natural Science Foundation of China [52070032, 21777017]
- Fundamental Research Funds for the Central Uni-versities [DUT21LAB101]
- Programme of Introducing Tal-ents of Discipline to Universities [B13012]
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In this study, a photo-assisted microbial electrosynthesis system was constructed using a urea-treated MnFe2O4/g-C3N4 cathode and nonphotosynthetic bacteria Serratia marcescens Q1. The system efficiently converted inorganic carbon into acetate with a high coulombic efficiency over a period of 24 days. The remarkable photocatalytic performance of the MnFe2O4/g-C3N4 heterojunction was attributed to the switch in charge transfer mechanism induced by oxygen vacancies and pyrrolic N after urea treatment.
Inorganic carbon (HCO3-) was efficiently converted into acetate (204.4 & PLUSMN; 0.5 mM with a coulombic efficiency of 96 & PLUSMN; 3% over 24 days operation) in a photo-assisted microbial electrosynthesis system (MES) using a urea-treated MnFe2O4/g-C3N4 cathode and the nonphotosynthetic bacteria Serratia marcescens Q1. The remarkable photocatalytic performance of MnFe2O4/g-C3N4 heterojunction was resulted from the charge transfer mechanism switch (from type II to Z-scheme) induced by the synergistic effect of oxygen vacancies and pyrrolic N after urea treatment. The increased pyrrolic N was conductive to photoinduced electron transfer while the oxygen va-cancies provided a higher fraction of surface-active sites for H-2 evolution, which was metabolized in-situ with bicarbonate by S. marcescens Q1 to yield acetate via the Wood-Ljungdahl pathway. This study provides a simple and feasible strategy for switching the photocatalytic charge transfer in a spinel-based heterojunction and offers new insights for ingeniously synthesizing photocatalysts with high CO(2 )conversion in MES.
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