Here, we report new gas diffusion electrodes (GDEs) prepared by mixing two different pore size carbonaceous matrices and pure and silver-doped manganese dioxide nanopowders, used as electrode supports and electrocatalytic materials, respectively. MnO2 nanoparticles are finely characterized in terms of structural (X-ray powder diffraction (XRPD), energy dispersive X-ray (EDX)), morphological (SEM, high-angle annular dark field (HAADF)-scanning transmission electron microscopy (STEM)/TEM), surface (Brunauer Emmet Teller (BET)-Barrett Joyner Halenda (BJH) method) and electrochemical properties. Two mesoporous carbons, showing diverse surface areas and pore volume distributions, have been employed. The GDE performances are evaluated by chronopotentiometric measurements to highlight the effects induced by the adopted materials. The best combination, hollow core mesoporous shell carbon (HCMSC) with 1.0% Ag-doped hydrothermal MnO2 (M_hydro_1.0%Ag) allows reaching very high specific capacity close to 1400 mAh g1. Considerably high charge retention through cycles is also observed, due to the presence of silver as a dopant for the electrocatalytic MnO2 nanoparticles.

The influence of carbonaceous matrices and electrocatalytic MnO2 nanopowders on lithium-air battery performances / A. Minguzzi, G. Longoni, G. Cappelletti, E. Pargoletti, C. Di Bari, C. Locatelli, M. Marelli, S. Rondinini, A. Vertova. - In: NANOMATERIALS. - ISSN 2079-4991. - 6:1(2016 Jan 06), pp. 10.1-10.15.

The influence of carbonaceous matrices and electrocatalytic MnO2 nanopowders on lithium-air battery performances

A. Minguzzi
Primo
;
G. Cappelletti
;
E. Pargoletti;C. Locatelli;S. Rondinini
Penultimo
;
A. Vertova
Ultimo
2016

Abstract

Here, we report new gas diffusion electrodes (GDEs) prepared by mixing two different pore size carbonaceous matrices and pure and silver-doped manganese dioxide nanopowders, used as electrode supports and electrocatalytic materials, respectively. MnO2 nanoparticles are finely characterized in terms of structural (X-ray powder diffraction (XRPD), energy dispersive X-ray (EDX)), morphological (SEM, high-angle annular dark field (HAADF)-scanning transmission electron microscopy (STEM)/TEM), surface (Brunauer Emmet Teller (BET)-Barrett Joyner Halenda (BJH) method) and electrochemical properties. Two mesoporous carbons, showing diverse surface areas and pore volume distributions, have been employed. The GDE performances are evaluated by chronopotentiometric measurements to highlight the effects induced by the adopted materials. The best combination, hollow core mesoporous shell carbon (HCMSC) with 1.0% Ag-doped hydrothermal MnO2 (M_hydro_1.0%Ag) allows reaching very high specific capacity close to 1400 mAh g1. Considerably high charge retention through cycles is also observed, due to the presence of silver as a dopant for the electrocatalytic MnO2 nanoparticles.
manganese dioxide nanoparticles; silver doping; mesoporous carbon; gas diffusion electrode (GDE); Li-air battery
Settore CHIM/02 - Chimica Fisica
6-gen-2016
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/366572
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