Journal
SOLAR RRL
Volume 4, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201900422
Keywords
composites; dendrimers; photochemistry; solar thermal fuels; surface modifications
Funding
- National Natural Science Foundation of China [51373025, 51773002]
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Molecular solar thermal fuels have received more and more attention recently to meet the ever-increasing global energy demands. However, molecular solar fuels are still impeded by low storage energy and short half-life. Herein, novel molecular solar fuels are prepared from azobenzenes grafted on graphene with layer-by-layer dendritic hyperbranched structures. The storage performances of photoactive molecular fuels can be increased significantly via layer-by-layer dendritic amplification. The energy density of three-layer hyperbranched fuels can reach up to 104 W h kg(-1) (374 J g(-1)), which is more than three times that of pristine azobenzenes (32 W h kg(-1) or 115 J g(-1)). Moreover, the storage half life of three-layer hyperbranched fuels can reach 80 h, which is much longer than that of pristine azobenzenes (2.5 h). This strategy of fabricating the azobenzene-graphene hybrids with hyperbranched structures paves a new way for the development of high-performance molecular solar thermal fuels.
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