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The Influence of Carbonaceous Matrices and Electrocatalytic MnO2 Nanopowders on Lithium-Air Battery Performances

AutorMinguzzi, Alessandro; Longoni, Gianluca; Cappelletti, Giuseppe; Pargoletti, Eleonora; Di Bari, Chiara; Locatelli, Cristina; Marelli, Marcello; Rondinini, Sandra; Vertova, Alberto
Fecha de publicación6-ene-2016
EditorMultidisciplinary Digital Publishing Institute
CitaciónNanomaterials 6 (1): 10 (2016)
ResumenHere, 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. MnO<sub>2</sub> 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 MnO<sub>2</sub> (M_hydro_1.0%Ag) allows reaching very high specific capacity close to 1400 mAh·g<sup>−1</sup>. Considerably high charge retention through cycles is also observed, due to the presence of silver as a dopant for the electrocatalytic MnO<sub>2</sub> nanoparticles.
Versión del editorhttps://doi.org/10.3390/nano6010010
URIhttp://hdl.handle.net/10261/149175
DOI10.3390/nano6010010
Identificadoresdoi: 10.3390/nano6010010
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