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Related Experiment Video

Updated: Sep 13, 2025

Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System
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Ultrafast electron transfer kinetics at semiconductor-microbe interface: key to efficient extracellular photoelectron

Yimei Du1,2, Yan Li1,2, Yanzhang Li1,2

  • 1SKLab-DeepMinE, MOEKLab-OBCE, School of Earth and Space Sciences, Peking University, Beijing, China.

Applied and Environmental Microbiology
|July 31, 2025
PubMed
Summary

Semiconductor-microbe hybrid systems show enhanced efficiency when using cadmium sulfide (CdS) nanoparticles with Shewanella oneidensis MR-1, due to faster electron transfer kinetics. This study highlights optimizing electron transfer for better energy conversion in these systems.

Keywords:
azo decolorizationextracellular photoelectron utilizationinterfacial kineticssemiconductor-microbe interfaceultrafast electron transfer

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Area of Science:

  • * Biotechnology and Nanotechnology: Focuses on the intersection of semiconductor materials and microbial systems for energy applications.
  • * Environmental Science: Investigates microbial energy metabolism and extracellular electron transfer.
  • * Materials Science: Explores the properties of cadmium zinc sulfide (CdxZn1-xS) nanoparticles.

Background:

  • * Semiconductor-microbe hybrid systems offer potential for enhanced energy conversion through synergistic interactions.
  • * Understanding ultrafast electron transfer kinetics at the semiconductor-microbe interface is crucial for optimizing system efficiency.
  • * The role of specific semiconductor materials and microbial redox pathways in photoelectron utilization is not fully understood.

Purpose of the Study:

  • * To investigate the impact of ultrafast electron transfer kinetics at CdxZn1-xS/Shewanella oneidensis MR-1 interfaces on energy conversion efficiency.
  • * To elucidate the mechanisms behind the enhanced reduction efficiency of direct blue 71 dye by CdxZn1-xS/MR-1 systems.
  • * To determine the influence of photoelectron lifetime and mobility on the performance of these hybrid systems.

Main Methods:

  • * Synthesis and characterization of CdxZn1-xS nanoparticles.
  • * Photoreduction experiments using direct blue 71 dye with CdxZn1-xS/MR-1 systems.
  • * Time-resolved spectroscopy and density functional theory (DFT) calculations to analyze electron transfer kinetics.
  • * Transcriptomic analysis and experiments with exogenous cytochrome c to study electron transfer pathways.

Main Results:

  • * CdS/MR-1 systems achieved 98% dye reduction, significantly outperforming ZnS/MR-1 (31%) within 1 hour.
  • * CdS/MR-1 exhibited longer photoelectron lifetime (1.14 ± 0.12 ps) and higher electron mobility (119.71 cm²/V·s) compared to ZnS/MR-1.
  • * Cytochrome c plays a key role in modulating electron transfer kinetics at the interface.
  • * Transcriptomic data indicated similar photoelectron transfer pathways, with CdS/MR-1's advantage attributed to kinetic factors.

Conclusions:

  • * Optimizing photoelectron transfer kinetics, specifically photoelectron lifetime and mobility, is critical for enhancing energy conversion efficiency in semiconductor-microbe hybrid systems.
  • * The superior performance of CdS/MR-1 is driven by favorable kinetics at the interface, leading to greater accumulation of bioavailable photoelectrons.
  • * This study provides foundational insights into the mechanisms of extracellular photoelectron utilization and microbial energy metabolism in hybrid systems.