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Efficient Hydrogen Delivery for Microbial Electrosynthesis via 3D-Printed Cathodes.

Frauke Kracke1, Jörg S Deutzmann1, Buddhinie S Jayathilake2

  • 1Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, United States.

Frontiers in Microbiology
|August 20, 2021
PubMed
Summary

3D-printed electrodes enhance microbial electrosynthesis by optimizing hydrogen (H2) delivery. This innovation achieves high methane production rates and efficiency, overcoming previous limitations in current supply for sustainable bioenergy.

Keywords:
3D-printingadditive manufacturing (3D printing)bioelectrochemical systemcurrent densitygas fermentationhydrogen mass transfermicrobial electrosynthesis

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Area of Science:

  • Biotechnology
  • Electrochemistry
  • Microbial Engineering

Background:

  • Microbial electrosynthesis offers advantages over traditional fermentation for bioenergy production.
  • Efficient in situ hydrogen (H2) delivery is crucial but technically challenging.
  • Current methods struggle with biocompatible, high-volume current supply.

Purpose of the Study:

  • To investigate the use of 3D-printed electrodes for improved H2 delivery in microbial electrosynthesis.
  • To optimize H2 delivery for enhanced electromethanogenesis.
  • To address limitations in current density and biocompatibility.

Main Methods:

  • Utilized 3D-printed carbon aerogel cathodes plated with nickel-molybdenum.
  • Employed a model system with Methanococcus maripaludis for H2-mediated electromethanogenesis.
  • Varied cathode surface area and current density to study H2 delivery efficiency.

Main Results:

  • Achieved an unprecedented volumetric methane production rate of 2.2 L/L/day.
  • Demonstrated a high coulombic efficiency of 99%.
  • Found that low current density (<1 mA/cm2) via high surface area cathodes is critical for efficiency, fast start-up, and stable performance.

Conclusions:

  • 3D-printed electrodes offer a flexible solution for fine-tuning H2 delivery.
  • Optimized current density and electrode design mitigate bubble formation and pH gradients.
  • This approach resolves critical limitations for in situ electron delivery in microbial electrosynthesis, paving the way for scalable bioenergy production.