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. 2020 Jan 20;216(1):9. doi: 10.1007/s11214-020-0635-5

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© The Author(s) 2020

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Fig. 8 — Reduction of CO₂ by H₂ across Fe(Ni)S barriers within an alkaline hydrothermal vent. (A) Electrons can theoretically be transferred across semiconducting barriers containing Fe(Ni)S minerals from H₂ in alkaline hydrothermal solutions to CO₂ in relatively acidic ocean waters to form organics. (B–C) Organics formed would not get lost to the ocean as the microporous structure (Deborah Kelley, University of Washington) could foster their accumulation due to thermophoresis. Recast from Lane (2017)