Bimetallic MPt (M: Co, Cu, Ni) alloy nanoparticles assembled on reduced graphene oxide as high performance cathode catalysts for rechargable lithium-oxygen batteries
| Autor: | Carlotta Francia, Julia Ginette Nicole Amici, Svetoslava Vankova, Önder Metin, Tansel Şener, Melike Sevim |
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| Rok vydání: | 2016 |
| Předmět: |
Bimetallic alloy nanoparticles
Electrocatalyst Lithium-oxygen battery Platinum Reduced graphene oxide Mechanics of Materials Mechanical Engineering 2506 Materials Chemistry Metals and Alloys Materials science Inorganic chemistry Oxide Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention chemistry.chemical_compound law Oleylamine Bimetallic strip Graphene 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences chemistry Metal acetylacetonates 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 683:231-240 |
| ISSN: | 0925-8388 |
| Popis: | In this work, the performance of bimetallic MPt (M: Co, Cu, Ni) alloy nanoparticles (NPs) assembled on reduced graphene oxide (rGO) as cathode catalysts for rechargable nonaqueous lithium-oxygen (Li-O-2) batteries was investigated. Monodisperse MPt alloy NPs were prepared by using one-pot protocol comprising the thermal decomposition of metal acetylacetonates in the presence of oleylamine (OAm) serving as surfactant, reducing agent and solvent. As-synthesized MPt alloy NPs were then assembled on reduced graphene oxide (rGO) via liquid self-assembly method. Both colloidal MPt alloy NPs and rGO assembled ones were characterized by TEM, XRD and ICP-MS. Next, the cathode performance of rGO-MPt catalysts were evaluated by studying the galvanostatic discharge-charge profiles that were carried out in a Li-O-2 cells using a solution of 0.5 M LiTFSI in DMSO as an electrolyte at an applied current density of 0.05 mA cm(-2). The Li-O-2 cells with rGO-MPt cathode catalysts provide the discharge capacities reaching up to about 9.0 mAh cm(-2). Among three rGO-MPt catalysts tested for the Li-O-2 battery, rGO-Co48Pt52 provided the highest discharge capacity of 9898 mAh g(-1) and 80 cycles at the curtailed capacity of 0.75 mAh cm(-2) whereas the rGO-Ni47Pt53 catalyst showed the most stable cycle-life. (C) 2016 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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