Benchmarking of commercial Cu catalysts in CO 2 electro-reduction using a gas-diffusion type microfluidic flow electrolyzer.

In this work, three commercial Cu catalysts were benchmarked in the CO 2 RR using a gas-diffusion type microfluidic flow electrolyzer. We showed that commercial Cu could deliver a high FE of near 80% for C 2+ product formations at 300 mA cm -2 . By tuning the catalyst loading, a high reaction rate of near 1 A cm -2 with a C 2+ product FE over 70% was achieved. Our results demonstrated that commercial Cu could achieve similar or better performances compared to many current catalysts by design in the CO 2 RR using similar electrolyzers. In addition, we showed that high CO reduction reaction (CORR) performance could also be achieved on commercial Cu, and disparities between CO and CO 2 electrolysis were discussed.