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Article Dans Une Revue Applied Catalysis B: Environmental Année : 2022

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

Résumé

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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Dates et versions

hal-03408555 , version 1 (29-10-2021)

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Gabriel Antonio Cerrón-Calle, Ana S Fajardo, Carlos M Sánchez-Sánchez, Sergi Garcia-Segura. Highly reactive Cu-Pt bimetallic 3D-electrocatalyst for selective nitrate reduction to ammonia. Applied Catalysis B: Environmental, 2022, 302, pp.120844. ⟨10.1016/j.apcatb.2021.120844⟩. ⟨hal-03408555⟩
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