水分解と生合成を組み合わせたハイブリッドシステムによる光合成を超えるCO2固定効率の実現
A biocompatible hybrid system was constructed by coupling an Earth-abundant inorganic water-splitting catalyst with the bacterium Ralstonia eutropha. Operating at low driving voltages, the catalyst generates molecular hydrogen and oxygen; the bacterium then consumes the hydrogen to fix CO2 into biomass and liquid fusel alcohols even under low CO2 concentrations in the presence of O2. The system achieves a CO2 reduction energy efficiency of approximately 50%, capturing 180 grams of CO2 per kilowatt-hour of electricity consumed. Integration with existing photovoltaic technology is projected to yield an overall efficiency of roughly 10%, surpassing the energy conversion efficiency of natural photosynthetic organisms.
An inorganic catalyst electrolyzes water to produce H2, which Ralstonia eutropha uses as an electron donor to reduce CO2 into biomass and fuel alcohols via autotrophic carbon fixation.
This is basic research at the cellular or molecular level. For human application, inhalation is the most promising delivery route, but inhalation carries explosion risk and concentration matters (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/27257255