Synergistic induced charge transfer switch by oxygen vacancy and pyrrolic nitrogen in MnFe2O4/g-C3N4 heterojunctions for efficient transformation of bicarbonate to acetate in photo-assisted MES

Kong, Weifeng ¹Huang, Liping ¹Quan, Xie ¹Puma, Gianluca Li²

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作者信息

1. Dalian Univ Technol
2. Loughborough Univ
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Abstract

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.

Key words

Microbial electrosynthesis/Photocatalysis/Charge transfer switching/Oxygen vacancy/Pyrrolic nitrogen/Z-SCHEME/H-2 PRODUCTION/DRIVEN CO2/PERFORMANCE/COMPOSITES/GENERATION/REMOVAL

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量21

参考文献量44

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