One-pot synthesis of Bi-reduced graphene oxide composite using supercritical acetone as anode for Na-ion batteries

Title
One-pot synthesis of Bi-reduced graphene oxide composite using supercritical acetone as anode for Na-ion batteries
Authors
정경윤박재호황지은김재훈
Issue Date
2020-05
Publisher
Chemical engineering journal
Citation
VOL 387, 124111
Abstract
A high-energy– density Bi-reduced graphene oxide (Bi-RGO) composite was synthesized using the quick one-pot supercritical acetone (scACT) method. The unique deoxygenation properties and ultrafast particle formation in scACT led to the simultaneous reduction of graphene oxide to reduced graphene oxide (RGO) and the formation of heterogeneously nucleated, nanosized Bi particles 10– 20 nm in size that were tightly anchored to the basal plane of RGO and homogeneously nucleated, large Bi particles 250– 950 nm in size. When tested as the anode of Na-ion batteries, the Bi-RGO composite delivered the high reversible capacity of 200 mAh g− 1 at 50 mA g− 1 and the high volumetric capacity of 60 Ah L− 1. In situ X-ray diffraction analysis revealed that the two-step alloying– dealloying Bi → NaBi → hexagonal Na3Bi or cubic Na3Bi reactions depended on the Bi particle size.
URI
http://pubs.kist.re.kr/handle/201004/70923
ISSN
1385-8947
Appears in Collections:
KIST Publication > Article
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