The electrochemical reduction of CO for sustainable fuel production has gained attention, but the reaction mechanism needs further clarification. Here the authors delve into the discussion regarding whether the rate-determining step for the generation of multi-carbon products is the C-C coupling or the hydrogenation of CO, and provide evidence for dimerization of two *CO as the pivotal step in this process.
- Wanyu Deng
- Peng Zhang
- Jinlong Gong