{"refrec":{"BRefID":295122,"RR":"<b>Kitadai, N.; Nakamura, R.; Yamamoto, M.; Takai, K.; Li, Y.; Yamaguchi, A.; Gilbert, A.; Ueno, Y.; Yoshida, N.; Oono, Y.</b> (2018). Geoelectrochemical CO production: Implications for the autotrophic origin of life. <i>Science Advances 4(4)</i>: eaao7265. <a href=\"https://dx.doi.org/10.1126/sciadv.aao7265\" target=\"_blank\">https://dx.doi.org/10.1126/sciadv.aao7265</a>","BEntID":287199,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Science Advances 4(4)</i>: eaao7265. <a href=\"https://dx.doi.org/10.1126/sciadv.aao7265\" target=\"_blank\">https://dx.doi.org/10.1126/sciadv.aao7265</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Kitadai, N.; Nakamura, R.; Yamamoto, M.; Takai, K.; Li, Y.; Yamaguchi, A.; Gilbert, A.; Ueno, Y.; Yoshida, N.; Oono, Y.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Kitadai, N. <i>et al.</i>","Englishabstract":"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 CO<sub>2</sub>-saturated NaCl solution at ≤–1 V (versus the standard hydrogen electrode). The threshold potential is readily generated in the H<sub>2</sub>-rich, high-temperature, and alkaline hydrothermal vents that were probably widespread on the early komatiitic and basaltic ocean crust. 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