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Orr in non-aqueous solvent for Li-air batteries: The influence of doped MnO2-nanoelectrocatalyst

Articolo
Data di Pubblicazione:
2020
Abstract:
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 MnO2 . Herein, we tried to design nano-MnO2 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 LiNO3 as electrolyte). Two percent Co-doped MnO2 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.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Cobalt doping; Electrocatalyst; Iron doping; Li-air battery; Manganese dioxide nanoparticles; Organic solvent; Oxygen reduction reaction
Elenco autori:
Pargoletti E.; Salvi A.; Giordana A.; Cerrato G.; Longhi M.; Minguzzi A.; Cappelletti G.; Vertova A.
Autori di Ateneo:
CERRATO Giuseppina
GIORDANA Alessia
Link alla scheda completa:
https://iris.unito.it/handle/2318/1768518
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1768518/697993/Nanomaterials-2020_Cerrato_1.pdf
Pubblicato in:
NANOMATERIALS
Journal
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