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Hydrogen production in microbial electrolysis cells with biocathodes
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Journal Article
Hydrogen production in microbial electrolysis cells with biocathodes
2024
Overview
Efficient hydrogen production in biocathode-driven microbial electrolysis cells (MECs) can be obtained by electroautotrophic microbes with the ability to regenerate biocatalytic activity.Inoculation and enrichment of a pure defined culture in the cathode are critical for high performance in hydrogen production.Zero-gap MECs with anion exchange membranes (AEMs) enhance hydrogen production due to low internal resistance and better pH balance.Engineered microbes and optimized microbe–electrode interactions can further increase MEC performance and accelerate its commercialization.
Electroautotrophic microbes at biocathodes in microbial electrolysis cells (MECs) can catalyze the hydrogen evolution reaction with low energy demand, facilitating long-term stable performance through specific and renewable biocatalysts. However, MECs have not yet reached commercialization due to a lack of understanding of the optimal microbial strains and reactor configurations for achieving high performance. Here, we critically analyze the criteria for the inocula selection, with a focus on the effect of hydrogenase activity and microbe–electrode interactions. We also evaluate the impact of the reactor design and key parameters, such as membrane type, composition, and electrode surface area on internal resistance, mass transport, and pH imbalances within MECs. This analysis paves the way for advancements that could propel biocathode-assisted MECs toward scalable hydrogen gas production.
Electroautotrophic microbes at biocathodes in microbial electrolysis cells (MECs) can catalyze the hydrogen evolution reaction with low energy demand, facilitating long-term stable performance through specific and renewable biocatalysts. However, MECs have not yet reached commercialization due to a lack of understanding of the optimal microbial strains and reactor configurations for achieving high performance. Here, we critically analyze the criteria for the inocula selection, with a focus on the effect of hydrogenase activity and microbe–electrode interactions. We also evaluate the impact of the reactor design and key parameters, such as membrane type, composition, and electrode surface area on internal resistance, mass transport, and pH imbalances within MECs. This analysis paves the way for advancements that could propel biocathode-assisted MECs toward scalable hydrogen gas production.
Publisher
Elsevier Ltd,Elsevier Limited,Elsevier
Subject
