Zn-Cu Alloy Nanofoams as Efficient Catalysts for the Reduction of CO 2 to Syngas Mixtures with a Potential-Independent H 2 /CO Ratio

Abstract : Alloying strategies are commonly used to design electrocatalysts that take on properties of their constituent elements. Herein, we explore the use of such a strategy to develop Zn-Cu alloyed electrodes with unique hierarchical porosity and tunable selectivity for CO2 vs. H + reduction. By varying the Zn:Cu ratio, tailored syngas mixtures were attained with no other gaseous products, which we assign to preferential CO and H2 forming pathways on the alloys. The syngas ratios were also significantly less sensitive to the applied potential in the alloys relative to pure metal equivalents; an essential quality when coupling electrocatalysis to renewable power sources of fluctuating intensity. As such, industrially-relevant syngas ratios were achieved at large currents (-60 mA) for extensive operating times (> 9 h), demonstrating the potential of this strategy for fossil-free fuel production.
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Submitted on : Friday, July 12, 2019 - 4:57:08 PM
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Sarah Lamaison, David Wakerley, David Montero, Gwenaëlle Rousse, Dario Taverna, et al.. Zn-Cu Alloy Nanofoams as Efficient Catalysts for the Reduction of CO 2 to Syngas Mixtures with a Potential-Independent H 2 /CO Ratio. ChemSusChem, ChemPubSoc Europe/Wiley, 2019, 12 (2), pp.511-517. ⟨10.1002/cssc.201802287⟩. ⟨hal-02182388⟩

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