期刊
ELECTROCHIMICA ACTA
卷 85, 期 -, 页码 444-449出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.08.023
关键词
Electrocatalyst; Li-air batteries; Oxygen electrode
资金
- Solid State and Materials Chemistry Program of the Division of Materials Research at the National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006113] Funding Source: National Science Foundation
A key constituent in developing lithium-air batteries is the oxygen electrode, which facilitates the oxygen reduction reaction during the discharge process and the oxidation reaction of Li2O2 during the charge process. In this article, we report on the electrocatalytic activity of platinum, iridium, and platinum-iridium alloy in an oxygen electrode. The average crystallite size of the previous metal nanoparticles was less than 2 nm, which were uniformly dispersed on the surface of chained Ketjenblack powder. Both chronoamperometry analysis and cell testing showed that Pt-Ir/C electrode exhibited superior activity and is the best electrode in this research. The discharge potentials for all three catalysts are similar, similar to 2.81 V vs. Li/Lit(+), and the discharge overpotential (similar to 0.15 V) is very low. The charge overpotential for Pt-Ir/C composites was around 0.6 V. (C) 2012 Elsevier Ltd. All rights reserved.
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