Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 39, Pages 12716-12720Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201806596
Keywords
bifunctional groups; covalent organic frameworks; intramolecular charge transfer; reversible electrochemical reaction; solar energy storage
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Funding
- National Natural Science Foundation of China [21501173, 21603229, 21771177, 21601190, 21872147, 21805277]
- Natural Science Foundation of Fujian Province [2014J05027, 2016J01080, 2018J05030]
- National Key R&D Program of China [2016YFB0100100]
- Strategic Priority Research Program of the CAS [XDB20000000]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH019]
- Science and Technology Planning Project of Fujian Province [2014H2008]
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A covalent organic framework integrating naphthalenediimide and triphenylamine units (NT-COF) is presented. Two-dimensional porous nanosheets are packed with a high specific surface area of 1276m(2)g(-1). Photo/electrochemical measurements reveal the ultrahigh efficient intramolecular charge transfer from the TPA to the NDI and the highly reversible electrochemical reaction in NT-COF. There is a synergetic effect in NT-COF between the reversible electrochemical reaction and intramolecular charge transfer with enhanced solar energy efficiency and an accelerated electrochemical reaction. This synergetic mechanism provides the key basis for direct solar-to-electrochemical energy conversion/storage. With the NT-COF as the cathode materials, a solar Li-ion battery is realized with decreased charge voltage (by 0.5V), increased discharge voltage (by 0.5V), and extra 38.7% battery efficiency.
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