Geoelectrochemical CO production: Implications for the autotrophic origin of life

Norio Kitadai, Ryuhei Nakamura, Masahiro Yamamoto, Ken Takai, Yamei Li, Akira Yamaguchi, Alexis Gilbert, Yuichiro Ueno, Naohiro Yoshida, Yoshi Oono

Research output: Contribution to journalArticle

Abstract

Wächtershäuser’s proposal of the autotrophic origin of life theory and subsequent laboratory demonstrations of relevant organic reactions have opened a new gate for the exploration of the origin of life. However, this scenario remains controversial because, at present, it requires a high pressure of CO as a source of carbon and reducing energy, although CO must have been a trace C species on the Hadean Earth. We show that, simulating a geoelectrochemical environment in deep-sea hydrothermal fields, CO production with up to ~40% Faraday efficiency was attainable on CdS in CO2-saturated NaCl solution at ≤–1 V (versus the standard hydrogen electrode). The threshold potential is readily generated in the H2-rich, high-temperature, and alkaline hydrothermal vents that were probably widespread on the early komatiitic and basaltic ocean crust. Thus, Wächtershäuser’s scenario starting from CO2 was likely to be realized in the Hadean ocean hydrothermal systems.

Original languageEnglish (US)
Article numbereaao7265
JournalScience Advances
Volume4
Issue number4
DOIs
StatePublished - Apr 4 2018

ASJC Scopus subject areas

  • General

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    Kitadai, N., Nakamura, R., Yamamoto, M., Takai, K., Li, Y., Yamaguchi, A., Gilbert, A., Ueno, Y., Yoshida, N., & Oono, Y. (2018). Geoelectrochemical CO production: Implications for the autotrophic origin of life. Science Advances, 4(4), [eaao7265]. https://doi.org/10.1126/sciadv.aao7265