Bimetallic MPt (M: Co, Cu, Ni) alloy nanoparticles assembled on reduced graphene oxide as high performance cathode catalysts for rechargable lithium-oxygen batteries

SEVİM M., FRANCIA C., AMICI J., VANKOVA S., SENER T., Metin O.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.683, ss.231-240, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 683
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.jallcom.2016.05.094
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.231-240
  • Anahtar Kelimeler: Platinum, Bimetallic alloy nanoparticles, Reduced graphene oxide, Electrocatalyst, Lithium-oxygen battery, ENHANCED ELECTROCATALYTIC ACTIVITY, REDUCTION REACTION, LI-O-2 BATTERIES, BIFUNCTIONAL CATALYST, DIMETHYL-SULFOXIDE, AIR BATTERIES, CARBON, LI, ELECTROLYTE, ARRAYS
  • Atatürk Üniversitesi Adresli: Evet

Özet

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.