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Electron-pool promotes interfacial electron transfer efficiency between pyrogenic carbon and anodic microbes.

Dandan Liang1, Weihua He1, Chao Li1

  • 1State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, China.

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|October 25, 2022
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Summary

Electrical capacitance in pyrogenic carbon (PC) enhances microbial extracellular electron transfer (EET). Higher capacitance in PC-900 boosted power density and Geobacter sp. enrichment, suggesting its role as an electron pool.

Keywords:
Electrical capacitanceGraphitic structureInterfacial electron transferMicrobial fuel cellPyrogenic carbon

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Area of Science:

  • Environmental science
  • Microbiology
  • Materials science

Background:

  • Pyrogenic carbon (PC) facilitates microbial extracellular electron transfer (EET) through surface functional groups and graphitic structure.
  • The specific role of electrical capacitance in microbial-PC EET remains largely unexplored.
  • EET is vital for numerous biogeochemical processes.

Purpose of the Study:

  • To investigate the influence of electrical capacitance on EET between microbes and pyrogenic carbon.
  • To determine the optimal carbonization temperature for enhancing EET properties.
  • To elucidate the mechanism by which electrical capacitance affects interfacial electron transfer.

Main Methods:

  • Pyrogenic carbons (PCs) were synthesized from fermented steam bread via carbonization at temperatures ranging from 700°C to 1100°C.
  • Electrical capacitance, charge transfer resistance, and conductivity of PCs were measured.
  • Electroactive biofilms were enriched on PC surfaces to assess interfacial EET.
  • Microbial community composition was analyzed using distance-based redundancy analysis.

Main Results:

  • PC-900, carbonized at 900°C, displayed the lowest charge transfer resistance and highest electrical capacitance, attributed to its graphitic and hierarchical porous structure.
  • PC-900 demonstrated significantly faster interfacial EET.
  • Maximum power density correlated positively with electrical capacitance, not conductivity.
  • PC-900 supported the highest abundance of Geobacter sp., correlating positively with electrical capacitance.

Conclusions:

  • Electrical capacitance plays a critical role in facilitating microbial-PC interfacial EET.
  • PC-900's superior electrical capacitance enhances EET efficiency and microbial electron transfer.
  • Electrical capacitance may function as an electron pool, improving interfacial EET performance.