A B S T R A C TThe electrochemical production of syngas would enable production of chemicals and transportation fuels from carbon dioxide, water and renewable energy, but a suitable process at the moment does not exist. In this paper we consider two options for syngas production: (i) CO 2 electrolysis to produce CO, water electrolysis to produce H 2 and then mixing the CO and H 2 to yield syngas; and (ii) the simultaneous coelectrolysis of CO 2 and H 2 O in a single electrolyzer. The results show that both processes can produce syngas at industrially important rates. In this paper we demonstrate CO 2 electrolysis at 100 mA/cm 2 , i.e., about 20 turnovers/s, and water electrolysis at 8 A/cm 2 at 2.0 V/cell, with about 1,600 turnovers/s. Both systems are stable for a thousand hours or more, i.e., millions of turnovers. We also demonstrate simultaneous CO and H 2 production in a single electrolyzer. These results demonstrate that syngas can be produced at industrially important rates via electrolysis.

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