No abstract

Alloying strategies are commonly used to design electrocatalysts that take on properties of their constituent elements. Herein, such a strategy is used to develop Zn–Cu alloyed electrodes with unique hierarchical porosity and tunable selectivity for CO2 versus H+ reduction. By varying the Zn/Cu ratio, tailored syngas mixtures are obtained without the production of other gaseous products, which is attributed to preferential CO‐ and H2‐forming pathways on the alloys. The syngas ratios are also significantly less sensitive to the applied potential in the alloys relative to pure metal equivalents; an essential quality when coupling electrocatalysis with renewable power sources that have fluctuating intensity. As such, industrially relevant syngas ratios are achieved at large currents (−60 mA) for extensive operating times (>9 h), demonstrating the potential of this strategy for fossil‐free fuel production.