“…Considering this reason, EC-CO 2 RR catalysis was focused on minimizing the hydrogen evolution to achieve higher CO 2 RR Faradaic efficiency (FE). − However, value-added products synthesized should be reacted with hydrogen. Instead, if the syngas with a desired, the H 2 :CO ratio can be produced from the electrochemical catalytic CO 2 RR, and it may be directly used in a thermo-catalytic process such as Fischer–Tropsch synthesis. , Nevertheless, most catalysts applied in the EC-CO 2 RR process, providing a limited versatility due to the products ratio, are not suitable for typical syngas application. Consequently, how to tune the H 2 :CO ratio under control in accordance with the sequent thermo-reaction is the key factor to the electrochemical catalysis of CO 2 RR. − …”