☆ 4.8 Article

Iron Telluride-Decorated Reduced Graphene Oxide Hybrid Microspheres as Anode Materials with Improved Na-Ion Storage Properties

ACS APPLIED MATERIALS & INTERFACES (2016)

期刊

ACS APPLIED MATERIALS & INTERFACES

卷 8, 期 33, 页码 21343-21349

出版社

AMER CHEMICAL SOC

DOI: 10.1021/acsami.6b05758

关键词

iron telluride; sodium ion batteries; graphene; carbon hybrid; spray pyrolysis

类别

Nanoscience & Nanotechnology Materials Science, Multidisciplinary

资金

National Research Foundation of Korea (NRF) - Korea government [NRF-2015R1A2A1A15056049]
Energy Efficiency AMP
Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning
Ministry of Trade, Industry AMP
Energy, Republic of Korea [201320200000420, 20153030091450]

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摘要

Transition-metal telluride materials are studied as the anode materials for Na-ion batteries (NIBs). The FeTe2-reduced graphene oxide (rGO) hybrid powders (first target material) are prepared via spray pyrolysis and subsequent tellurization. The H2Te gas treatment transforms the Fe3O4 rGO powders to FeTe2-rGO hybrid powders with FeTe2 nanocrystals (various sizes <100 nm) embedded within the rGO. The FeTe2-rGO hybrid powders contain 5 wt % rGO. The Na-ion storage mechanism for FeTe2 in NIBS is described by FeTe2 + 4Na(+) + 4e(-)<-> Fe + 2Na(2)Te. The FeTe2-rGO hybrid discharge process forms metallic Fe nanocrystals and Na2Te by a conversion reaction of FeTe2 with Na ions. The discharge capacities of the FeTe2-rGO hybrid powders for the first and 80th cycles are 493 and 293 mA h g(-1), respectively. The discharge capacities of the bare FeTe2 powders for the first and 80th cycles are 462 and 83 mA h g(-1), respectively. The FeTe2-rGO hybrid powders have superior Na-ion storage properties compared to bare FeTe, powders owing to their high structural stability and electrical conductivity.

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