Direct CO2 delivery with hollow stainless steel/graphene foam electrode for enhanced methane production in microbial electrosynthesis

Re-evaluating the Contribution of a Fe-Based Current Collector to Bioelectrochemical Methanogenesis: Role and Mechanisms

“…After switching the operation mode from continuous to batch mode to investigate the periodic CO 2 electromethanogenesis, the average CH 4 production rate for both cathodes decreased slightly due to the diffusion limitation of available CO 2 , but Bio FeCF still held a superior catalytic ability toward CO 2 electromethanogenesis over Bio CF even after 300 days, indicative of its long-term prominent stability (Figure 1c, Figure S4). The CH 4 producing rate and FE CH4 of Bio FeCF in this study outperformed most of the reported biocathodes which have been modified by redox mediator, 2 metal or metal oxides, 17,18 stainless steel and graphene foam hybrid 3 D electrode, 19 etc. (Figure 1d, Table S1).…”

Microbial electrosynthesis: carbonaceous electrode materials for CO2 conversion

“…The biofilm formation on the electrode is crucial to ensure high levels of electron transfer during the bioconversion process since electrochemically active microorganisms are the essential factors affecting MES performance 46 . The electron transfer mechanism serves as the prime factor in CO2 conversion, and catalytic sites must easily bind to the CO2 molecules 47 . Extracellular electron transfer (EET) is a critical step in MES, and several investigations have been conducted to uncover the molecular pathways involved in the EET.…”

“…46 The electron transfer mechanism serves as the prime factor in CO 2 conversion, and catalytic sites must easily bind to the CO 2 molecules. 47 Extracellular electron transfer (EET) is a critical step in MES, and several investigations have been conducted to uncover the molecular pathways involved in EET. The actual mechanism, on the other hand, remains a mystery.…”

Quantitative and Non‐Quantitative Assessments of Enzymatic Electrosynthesis: A Case Study of Parameter Requirements

“…Electro‐biotechnological production processes can be divided in microbial and enzymatic electrosynthesis (MES or EES). In MES, the metabolic pathways of organisms are used to produce complex molecules such as bioplastics or terpenes as well as bulk chemicals such as acetate, methane and isopropanol [2–8] . In contrast, EES addresses mostly single reaction steps or small cascades up to 3 enzymatic reactions.…”

“…In MES, the metabolic pathways of organisms are used to produce complex molecules such as bioplastics or terpenes as well as bulk chemicals such as acetate, methane and isopropanol. [2][3][4][5][6][7][8] In contrast, EES addresses mostly single reaction steps or small cascades up to 3 enzymatic reactions. EES has gained prominence because of its use of renewable energy inputs as well as highly specific enzyme biocatalysts and its capability of performing reactions with high yields.…”