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  • 标题:Covalent functionalization of graphene by azobenzene with molecular hydrogen bonds for long-term solar thermal storage
  • 本地全文:下载
  • 作者:Yiyu Feng ; Hongpo Liu ; Wen Luo
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2013
  • 卷号:3
  • DOI:10.1038/srep03260
  • 出版社:Springer Nature
  • 摘要:Reduced graphene oxide-azobenzene (RGO-AZO) hybrids were prepared via covalent functionalization for long-term solar thermal storage. Thermal barrier (Δ Ea ) of cis to tran reversion and thermal storage (Δ H ) were improved by molecular hydrogen bonds (H-bonds) through ortho - or para -substitution of AZO. Intramolecular H-bonds thermally stabilized cis - ortho -AZO on RGO with a long-term half-life of 5400 h (Δ Ea = 1.2 eV), which was much longer than that of RGO- para -AZO (116 h). RGO- para -AZO with one intermolecular H-bond showed a high density of thermal storage up to 269.8 kJ kg−1 compared with RGO- ortho -AZO (149.6 kJ kg−1) with multiple intra- and intermolecular H-bonds of AZO according to relaxed stable structures. Thermal storage in experiment was the same order magnitude to theoretical data based on Δ H calculated by density functional theory and packing density. Photoactive RGO-AZO hybrid can be developed for high-performance solar thermal storage by optimizing molecular H-bonds.
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