Microbial bioelectrosynthesis of hydrogen: Current challenges and scale-up

Area of Science:

• Sustainable energy technologies
• Biotechnology
• Electrochemistry

Background:

• Fossil fuels are non-renewable, necessitating sustainable energy alternatives.
• Molecular hydrogen (H2) is a clean-burning, high-energy fuel with industrial applications.
• Current H2 production methods, like steam reforming, rely on non-renewable natural gas, while biosynthetic routes suffer from low yield and high costs.

Purpose of the Study:

• To review and critically analyze factors affecting the performance of microbial electrolysis cells (MECs) for H2 bioelectrosynthesis.
• To explore the potential for scaling up MEC technology for sustainable H2 production.

Main Methods:

• Review of existing literature on microbial electrolysis cells (MECs) for H2 production.
• Critical analysis of experimental parameters influencing MEC performance, including electrode material, reactor design, microbial consortia, and substrate.
• Discussion of scale-up potential for bioelectrosynthesis.

Main Results:

• Microbial electrolysis cells (MECs) improve the yield of biological H2 production by applying an electrochemical driving force.
• MEC performance is significantly influenced by key experimental parameters.
• The review critically analyzes these factors and their impact on H2 yield and efficiency.

Conclusions:

• MECs represent a promising approach for sustainable molecular hydrogen (H2) production.
• Optimizing experimental parameters is crucial for enhancing MEC performance and efficiency.
• Further research and development are needed to realize the scale-up potential of H2 bioelectrosynthesis using MECs.