Volume 137, Issue 8 e202416027
Forschungsartikel
Open Access

Multivariate Approaches Boosting Lithium-Mediated Ammonia Electrosynthesis in Different Electrolytes

Anna Mangini

Anna Mangini

Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129 Italy

Contribution: Conceptualization (equal), Data curation (lead), ​Investigation (lead), Methodology (equal), Writing - original draft (lead)

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Jon Bjarke Valbæk Mygind

Jon Bjarke Valbæk Mygind

Department of Physics, Technical University of Denmark, Fysikvej, Kongens Lyngby, 2800 Denmark

Contribution: Conceptualization (lead), Data curation (supporting), Formal analysis (supporting), ​Investigation (equal), Writing - review & editing (equal)

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Sara Garcia Ballesteros

Corresponding Author

Sara Garcia Ballesteros

Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129 Italy

Contribution: Data curation (equal), Formal analysis (equal), Funding acquisition (equal), Methodology (equal), Project administration (supporting), Supervision (equal), Validation (equal), Writing - original draft (equal)

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Alessandro Pedico

Alessandro Pedico

Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129 Italy

Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce, 91, 10135 Torino, Italy

Contribution: Data curation (supporting), Formal analysis (supporting), Methodology (supporting)

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Marco Armandi

Marco Armandi

Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129 Italy

Contribution: Data curation (supporting), ​Investigation (supporting), Supervision (supporting), Writing - review & editing (equal)

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Ib Chorkendorff

Ib Chorkendorff

Department of Physics, Technical University of Denmark, Fysikvej, Kongens Lyngby, 2800 Denmark

Contribution: Conceptualization (equal), Funding acquisition (lead), Project administration (lead), Supervision (lead), Writing - review & editing (supporting)

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Federico Bella

Corresponding Author

Federico Bella

Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129 Italy

Contribution: Conceptualization (lead), Funding acquisition (lead), Project administration (lead), Supervision (lead), Writing - review & editing (lead)

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First published: 17 January 2025
Citations: 3

Abstract

Ammonia electrosynthesis through the lithium-mediated approach has recently reached promising results towards high activity and selectivity in aprotic media, reaching high Faradaic efficiency (FE) values and NH3 production rates. To fasten the comprehension and optimization of the complex lithium-mediated nitrogen reduction system, for the first time a multivariate approach is proposed as a powerful tool to reduce the number of experiments in comparison with the classical one-factor-at-a-time approach. Doehlert design and surface response methodology are employed to optimize the electrolyte composition for a batch autoclaved cell. The method is validated with the common LiBF4 salt, and the correlations between the FE and the amount of lithium salt and ethanol as proton donor are elucidated, also discussing their impact on the solid electrolyte interphase (SEI) layer. Moreover, a new fluorinated salt is proposed (i.e., lithium difluoro(oxalate) borate (LiFOB)), taking inspiration from lithium batteries. This salt is chosen to tailor the SEI layer, with the aim of obtaining a bifunctional interfacial layer, both stable and permeable to N2, the latter being an essential characteristic for batch systems. The SEI layer composition is confirmed strategic and its tailoring with LiFOB boosts FE values.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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