High-temperature (HT) LiCoO2 recycled from spent lithium ion batteries as catalyst for oxygen evolution reaction
| Autor: | L. B. Magnago, M.B.J.G. Freitas, P.V.M. Dixini, V.C.B. Pegoretti, M.F.F. Lelis, A.K.S. Rocha |
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| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science Mechanical Engineering Oxygen evolution chemistry.chemical_element 02 engineering and technology Chronoamperometry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis Dielectric spectroscopy chemistry Chemical engineering Mechanics of Materials General Materials Science Lithium Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Materials Research Bulletin. 110:97-101 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2018.10.022 |
| Popis: | Development of novel materials based on inexpensive metals is crucial for renewable energy storage technologies. Furthermore, the recycling of compounds, such as lithium cobaltate (LiCoO2) from Li-ion battery cathodes, contributes to the recovery of important elements, such as Co and Li. The applicability of high-temperature (HT) LiCoO2 as a multifunctional material has been tested. In this work, HT LiCoO2 is used as an electrocatalyst for the oxygen evolution reaction (OER). Cyclic voltammetry and chronoamperometry tests show that the evolution of oxygen starts at 0.35 V accompanied by the formation of Co4+ ions. The activation free energy of the reaction calculated using Tafel plot is 28.0 kJ mol−1 and electrochemical impedance spectroscopy elucidates an equivalent circuit with a transfer charge resistance of 1.55 Ω, Warburg impedance of 150.3 Ω, and constant phase elements of 3.50 and 1.35 m F inside the pores and at the double layer, respectively. |
| Databáze: | OpenAIRE |
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