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Highly reactive Cu-Pt bimetallic 3D-electrocatalyst for selective nitrate reduction to ammonia

Abstract : Identifying electrocatalytic materials that generate fossil-free ammonia through N-recycling from polluted water sources is required. Bimetallic Cu-Pt foam electrodes were synthesized to enhance electrochemical reduction of nitrate (ERN) by the introduction of bimetallic catalytic sites. Electrodes were benchmarked against Cu foam using engineering figures of merit. Cu-Pt (180 s) electrode achieved 94% conversion of NO3--N in 120 min yielding 194.4 mg NH3- N L-1 gcat-1, with a selectivity towards ammonia (SNH3) of 84% and an electrical energy per order decrease by ~70% respect pristine Cu foam. Bimetallic electrodes with low Pt loadings (<0.50 wt%) demonstrated that synergistic effects of Cu-Pt nanointerfaces enabled hybridized mechanisms of catalytic electrochemical and hydrogenation reduction processes. These encouraging outcomes emphasize the potential of Cu-Pt foam electrodes to treat contaminated water sources with nitrate, while allowing a sustainable decentralized ammonia recovery. Enriched water for crops irrigation can therefore be a prospect use for this added value product.
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https://hal.archives-ouvertes.fr/hal-03408555
Contributor : Véronique Martin Connect in order to contact the contributor
Submitted on : Friday, October 29, 2021 - 11:06:33 AM
Last modification on : Tuesday, January 4, 2022 - 6:03:51 AM

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Gabriel Cerrón-Calle, Ana Fajardo, Carlos Sánchez-Sánchez, Sergi Garcia-Segura. Highly reactive Cu-Pt bimetallic 3D-electrocatalyst for selective nitrate reduction to ammonia. Applied Catalysis B: Environmental, Elsevier, 2022, pp.120844. ⟨10.1016/j.apcatb.2021.120844⟩. ⟨hal-03408555⟩

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