Delineating cathodic extracellular electron transfer pathways in microbial electrosynthesis: Modulation of polarized potential and Pt@C addition

Yue Wang; Siyang Yu; Xue Zheng; Xiaobing Wu; Ying Pu; Gaoying Wu; Na Chu; Xiaohong He; Daping Li; Raymond Jianxiong Zeng; Yong Jiang

doi:10.1016/j.biortech.2024.130754

Delineating cathodic extracellular electron transfer pathways in microbial electrosynthesis: Modulation of polarized potential and Pt@C addition

Bioresour Technol. 2024 Apr 27:402:130754. doi: 10.1016/j.biortech.2024.130754. Online ahead of print.

Authors

Yue Wang¹, Siyang Yu¹, Xue Zheng¹, Xiaobing Wu¹, Ying Pu¹, Gaoying Wu¹, Na Chu², Xiaohong He³, Daping Li³, Raymond Jianxiong Zeng¹, Yong Jiang⁴

Affiliations

¹ Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
² Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China; CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China.
³ CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
⁴ Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China. Electronic address: jiangyongchange@163.com.

PMID: 38685518
DOI: 10.1016/j.biortech.2024.130754

Abstract

Microbial electrosynthesis (MES) is an innovative technology that employs microbes to synthesize chemicals by reducing CO₂. A comprehensive understanding of cathodic extracellular electron transfer (CEET) is essential for the advancement of this technology. This study explores the impact of different cathodic potentials on CEET and its response to introduction of hydrogen evolution materials (Pt@C). Without the addition of Pt@C, H₂-mediated CEET contributed up to 94.4 % at -1.05 V. With the addition of Pt@C, H₂-mediated CEET contributions were 76.6 % (-1.05 V) and 19.9 % (-0.85 V), respectively. BRH-c20a was enriched as the dominated microbe (>80 %), and its relative abundance was largely affected by the addition of Pt@C NPs. This study highlights the tunability of MES performance through cathodic potential control and the addition of metal nanoparticles.

Keywords: CO(2) reduction; Cathodic potential; Hydrogen evolution; Metal nanoparticles; Microbial electrochemical technology.