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Type: Artigo
Title: Ag-Co electrocatalysts for rechargeable lithium-O-2 batteries: O-2 pressure and current density effects
Author: Costa, Josiel Martins
de Almeida Neto, Ambrosio Florencio
Abstract: In this study, we evaluated the Ag-Co alloy as a catalyst in the Li-O-2 battery electrode aiming to improve the electrochemical performance of the energy system. Ag-Co alloys were obtained by cyclic voltammetry from an electrolytic bath. The influence of O-2 pressure (1.5, 2.0, and 2.5 atm) and current density (25, 50, and 75 mu A cm(-2)) on the charge and discharge on the cell were studied. It was observed that a medium value of O-2 pressure and current density was favorable to obtain a high capacity. Energy-dispersive X-ray presented that the cyclic voltammetry technique did not favor cobalt deposition. Scanning electron microscopy showed homogeneity of the deposits with the presence of cracks and small crystals. X-ray diffraction evidenced Li2O as well as the Raman spectra for nickel foam electrode. Oxygen evolution reaction was improved with Ag-Co catalyst according to linear sweep voltammetry and cyclic voltammetry analysis. Steel mesh electrode showed higher discharge capacity (336 mAh g(c)(-1)) when compared with nickel foam (115 mAh g(c)(-1)) which suggests that materials with lower cost can be used as electrodes in Li-O-2 batteries
Subject: Eletrodeposição
Ligas (Metalurgia)
Country: Estados Unidos
Editor: Springer
Rights: Fechado
Identifier DOI: 10.1007/s12678-019-00540-7
Date Issue: 2019
Appears in Collections:IQ - Artigos e Outros Documentos

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