Abstract
A simple one-pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders for application as anode materials in sodium-ion batteries was developed. The detailed mechanism of formation of the CoSex-rGO composite powders that were selected as the first target material in the spray pyrolysis process was studied. The crumple-structured CoSex-rGO composite powders prepared by spray pyrolysis at 800 °C had a crystal structure consisting mainly of Co0.85Se with a minor phase of CoSe2. The bare CoSex powders prepared for comparison had a spherical shape and hollow structure. The discharge capacities of the CoSex-rGO composite and bare CoSex powders in the 50th cycle at a constant current density of 0.3 A g-1 were 420 and 215 mA h g-1, respectively, and their capacity retentions measured from the second cycle were 80 and 46 %, respectively. The high structural stability of the CoSex-rGO composite powders for repeated sodium-ion charge and discharge processes resulted in superior sodium-ion storage properties compared to those of the bare CoSex powders. Spray composites: A simple one-pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders by a spray pyrolysis process was developed (see figure). This process could be applied in the preparation of crumple-structured cobalt selenide/rGO composite powders with various compositions for applications including anode materials for sodium-ion batteries.
Original language | English |
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Pages (from-to) | 4140-4146 |
Number of pages | 7 |
Journal | Chemistry - A European Journal |
Volume | 22 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2016 Mar 14 |
Keywords
- electrochemistry
- graphene
- metal selenides
- nanostructures
- sodium-ion batteries
ASJC Scopus subject areas
- Chemistry(all)