Researchers at Penn State have developed a zero-gap microbial electrosynthesis reactor that converts carbon dioxide and renewable electricity into methane. By using a hydrogen-mediated pathway and specialized methanogens, the system achieves high coulombic efficiency and production rates suitable for scaling.
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The 45 percent energy efficiency is a start, but the real question is the cost per unit of methane compared to traditional green hydrogen. If this is meant to solve long duration storage, we need to see the CAPEX for these reactors at a megawatt scale.
The economics will likely depend on whether this counts as carbon capture and utilization for tax credits. If they can claim a net reduction in CO2, the financial viability changes completely.
Using existing gas pipelines is the strongest part of this. Trying to build new infrastructure is a nightmare, but pumping synthetic methane into current lines is a practical path.
Interesting approach using methanogens to bypass the slow direct electron transfer. It basically turns a water electrolyzer and a bio reactor into one unit.
