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

Nanomaterials

Alessandro Minguzzi¹  Gianluca Longoni⁴  Giuseppe Cappelletti¹  Eleonora Pargoletti¹  Chiara Di Bari³  Cristina Locatelli¹  Marcello Marelli²  Sandra Rondinini¹  Alberto Vertova¹  Hermenegildo Garc໚⁵ 

[1] Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy;CNR-ISTM/ISTeM, via Fantoli 15/16, 20138 Milano, Italy;Istituto de Catalisis y Petroleoquimica, Consejo Superior de Investigaciones Cientificas, C/Marie Curie 2, L10, 28049 Madrid, Spain;Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, via Roberto Cozzi 55, 20125 Milano, Italy;;Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy

关键词: manganese dioxide nanoparticles;    silver doping;    mesoporous carbon;    gas diffusion electrode (GDE);    Li-air battery;   

DOI  :  10.3390/nano6010010

来源: mdpi

【 摘 要 】

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·g⁻¹. Considerably high charge retention through cycles is also observed, due to the presence of silver as a dopant for the electrocatalytic MnO₂ nanoparticles.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.