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ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst
One of the major drawbacks in Lithium-air batteries is the sluggish kinetics of the oxygen reduction reaction (ORR). In this context, better performances can be achieved by adopting a suitable electrocatalyst, such as MnO(2). Herein, we tried to design nano-MnO(2) tuning the final ORR electroactivit...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7558571/ https://www.ncbi.nlm.nih.gov/pubmed/32882878 http://dx.doi.org/10.3390/nano10091735 |
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author | Pargoletti, Eleonora Salvi, Annalisa Giordana, Alessia Cerrato, Giuseppina Longhi, Mariangela Minguzzi, Alessandro Cappelletti, Giuseppe Vertova, Alberto |
author_facet | Pargoletti, Eleonora Salvi, Annalisa Giordana, Alessia Cerrato, Giuseppina Longhi, Mariangela Minguzzi, Alessandro Cappelletti, Giuseppe Vertova, Alberto |
author_sort | Pargoletti, Eleonora |
collection | PubMed |
description | One of the major drawbacks in Lithium-air batteries is the sluggish kinetics of the oxygen reduction reaction (ORR). In this context, better performances can be achieved by adopting a suitable electrocatalyst, such as MnO(2). Herein, we tried to design nano-MnO(2) tuning the final ORR electroactivity by tailoring the doping agent (Co or Fe) and its content (2% or 5% molar ratios). Staircase-linear sweep voltammetries (S-LSV) were performed to investigate the nanopowders electrocatalytic behavior in organic solvent (propylene carbonate, PC and 0.15 M LiNO(3) as electrolyte). Two percent Co-doped MnO(2) revealed to be the best-performing sample in terms of ORR onset shift (of ~130 mV with respect to bare glassy carbon electrode), due to its great lattice defectivity and presence of the highly electroactive γ polymorph (by X-ray diffraction analyses, XRPD and infrared spectroscopy, FTIR). 5% Co together with 2% Fe could also be promising, since they exhibited fewer diffusive limitations, mainly due to their peculiar pore distribution (by Brunauer–Emmett-Teller, BET) that disfavored the cathode clogging. Particularly, a too-high Fe content led to iron segregation (by energy dispersive X-ray spectroscopy, EDX, X-ray photoelectron spectroscopy, XPS and FTIR) provoking a decrease of the electroactive sites, with negative consequences for the ORR. |
format | Online Article Text |
id | pubmed-7558571 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-75585712020-10-26 ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst Pargoletti, Eleonora Salvi, Annalisa Giordana, Alessia Cerrato, Giuseppina Longhi, Mariangela Minguzzi, Alessandro Cappelletti, Giuseppe Vertova, Alberto Nanomaterials (Basel) Article One of the major drawbacks in Lithium-air batteries is the sluggish kinetics of the oxygen reduction reaction (ORR). In this context, better performances can be achieved by adopting a suitable electrocatalyst, such as MnO(2). Herein, we tried to design nano-MnO(2) tuning the final ORR electroactivity by tailoring the doping agent (Co or Fe) and its content (2% or 5% molar ratios). Staircase-linear sweep voltammetries (S-LSV) were performed to investigate the nanopowders electrocatalytic behavior in organic solvent (propylene carbonate, PC and 0.15 M LiNO(3) as electrolyte). Two percent Co-doped MnO(2) revealed to be the best-performing sample in terms of ORR onset shift (of ~130 mV with respect to bare glassy carbon electrode), due to its great lattice defectivity and presence of the highly electroactive γ polymorph (by X-ray diffraction analyses, XRPD and infrared spectroscopy, FTIR). 5% Co together with 2% Fe could also be promising, since they exhibited fewer diffusive limitations, mainly due to their peculiar pore distribution (by Brunauer–Emmett-Teller, BET) that disfavored the cathode clogging. Particularly, a too-high Fe content led to iron segregation (by energy dispersive X-ray spectroscopy, EDX, X-ray photoelectron spectroscopy, XPS and FTIR) provoking a decrease of the electroactive sites, with negative consequences for the ORR. MDPI 2020-09-01 /pmc/articles/PMC7558571/ /pubmed/32882878 http://dx.doi.org/10.3390/nano10091735 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Pargoletti, Eleonora Salvi, Annalisa Giordana, Alessia Cerrato, Giuseppina Longhi, Mariangela Minguzzi, Alessandro Cappelletti, Giuseppe Vertova, Alberto ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst |
title | ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst |
title_full | ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst |
title_fullStr | ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst |
title_full_unstemmed | ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst |
title_short | ORR in Non-Aqueous Solvent for Li-Air Batteries: The Influence of Doped MnO(2)-Nanoelectrocatalyst |
title_sort | orr in non-aqueous solvent for li-air batteries: the influence of doped mno(2)-nanoelectrocatalyst |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7558571/ https://www.ncbi.nlm.nih.gov/pubmed/32882878 http://dx.doi.org/10.3390/nano10091735 |
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