General Synthesis of N-Doped Macroporous Graphene-Encapsulated Mesoporous Metal Oxides and Their Application as New Anode Materials for Sodium-Ion Hybrid Supercapacitors
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- Title
- General Synthesis of N-Doped Macroporous Graphene-Encapsulated Mesoporous Metal Oxides and Their Application as New Anode Materials for Sodium-Ion Hybrid Supercapacitors
- Authors
- Kim, M.S.; Lim, E.; Kim, S.; Jo, C.; Chun, J.; Lee, J.
- Date Issued
- 2017-01
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- A general method to synthesize mesoporous metal oxide@N-doped macroporous graphene composite by heat-treatment of electrostatically co-assembled amine-functionalized mesoporous silica/metal oxide composite and graphene oxide, and subsequent silica removal to produce mesoporous metal oxide and N-doped macroporous graphene simultaneously is reported. Four mesoporous metal oxides (WO3? x, Co3O4, Mn2O3, and Fe3O4) are encapsulated in N-doped macroporous graphene. Used as an anode material for sodium-ion hybrid supercapacitors (Na-HSCs), mesoporous reduced tungsten oxide@N-doped macroporous graphene (m-WO3? x @NM-rGO) gives outstanding rate capability and stable cycle life. Ex situ analyses suggest that the electrochemical reaction mechanism of m-WO3? x @NM-rGO is based on Na+ intercalation/de-intercalation. To the best of knowledge, this is the first report on Na+ intercalation/de-intercalation properties of WO3? x and its application to Na-HSCs. ? 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- Keywords
- Anodes; Doping (additives); Electrodes; Graphene; Hybrid materials; Ions; Manganese; Metal ions; Metallic compounds; Metals; Silica; Amine-functionalized mesoporous silica; Electrochemical reactions; Graphene composites; Hybrid supercapacitors; Mesoporous metal oxides; N-doped; New anode material; Sodium ions; Mesoporous materials
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92138
- DOI
- 10.1002/adfm.201603921
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- ADVANCED FUNCTIONAL MATERIALS, vol. 27, no. 3, 2017-01
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