High-Current-Density CO2-to-CO Electroreduction on Ag-Alloyed Zn Dendrites at Elevated Pressure
Résumé
High-surface-area Ag-Zn-alloyed electrodes undertake the rapid conversion of CO 2 to CO. This has the combined benefit of removing CO 2 and producing an industrially relevant chemical synthon. At atmospheric pressure, the electrodes plateau in activity owing to the mass-transport limitation of CO 2. The use of elevated CO 2 pressures (up to 9.5 bar) allowed industrially relevant CO production rates of up to À286 mA.cm À2 to be reached, revealing the high intrinsic activity of the so-generated Ag-Zn alloys. HIGHLIGHTS An electrodeposition strategy produced hierarchically porous Ag-Zn alloys These Ag-Zn surfaces demonstrated >90% selectivity for CO 2 electroreduction to CO CO 2 mass transport limited the CO production rate to $À21 mA.cm À2 at 1 atm At elevated pressure (up to 9.5 bar) of CO 2 , CO production reached À286 mA.cm À2 Lamaison et al., Joule 4, 1-12 February 19, 2020 ª