4.6 Article

?-Fe2O3/g-C3N4 Z-Scheme Heterojunction Photocathode to Enhance Microbial Electrosynthesis of Acetate from CO2

期刊

ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 10, 期 51, 页码 17308-17317

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.2c05724

关键词

Microbial electrosynthesis; Photocathode; Electron transfer

资金

  1. National Key Research and Development Program of China
  2. National Natural Science Foundation of China
  3. Natural Science Founda- tion of Jiangsu Province
  4. [2021YFA0910400]
  5. [21878150]
  6. [22078149]
  7. [BK20220002]

向作者/读者索取更多资源

This study investigates a method for CO2 fixation via a visible-light responsive photocathode microbial electrosynthesis (MES). By constructing an alpha-Fe2O3/g-C3N4 heterojunction structure, efficient electron-hole separation under visible light is achieved. The introduction of alpha-Fe2O3 promotes electron transfer and improves acetate production. This work provides new opportunities for constructing a highly efficient photocathode for MES.
A visible-light responsive photocathode microbial electrosynthesis (MES) is an attractive method for CO2 fixation via a microbial electrochemical process. Here, an alpha-Fe2O3/g-C3N4 formed a Z-scheme heterojunction structure and exhibits high photogenerated electron-hole separation ability under visible light. The low valence band potential of alpha-Fe2O3 makes binding electrons transferred from the anode easier for photogenerated holes, providing an additional driving force to improve MES performance. Furthermore, the introduction of alpha-Fe2O3 can promote electron transfer between the electrode and micro-organisms. alpha-Fe2O3/g-C3N4 achieved an acetate production rate of 0.33 g L-1 d-1, which increased by 3-fold compared to a carbon felt cathode. This work provides new opportunities for constructing a highly efficient photocathode for MES.

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