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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| Authors: | Min Su Kim Eunho Lim Seongbeen Kim Changshin Jo Jinyoung Chun Jinwoo Lee |
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| Affiliation: | 1. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea;2. School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea |
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| 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. |
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| Keywords: | mesoporous metal oxides N‐doped graphene sodium‐ion hybrid supercapacitors sodium‐ion intercalation anodes |
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