metabolisms, producing thioestres. Although the aforementioned primordial CO2 fixation routes to thioestres are frequently proposed, none of them have any proof from experiments. Here, we show that nickel sulphide (NiS) gradually lowers to Ni0 under an electrochemical state that is achievable in early ocean hydrothermal systems while collecting surface-bound CO owing to CO2 electroreduction. Even at room temperature and a neutral pH, the resulting partially reduced NiS makes it easier to produce the Thioester (S-methyl thioacetate) from CO and methanethiol. NiS coprecipitating with FeS or CoS can increase the selectivity of this thioestre synthesis up to 56%. Given the significance of Ni in the aforementioned enzymatic activity, our shown thioestre production using the partly reduced NiS could have a significant impact.
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