Direct Solar-to-Electrochemical Energy Storage in a Functionalized Covalent Organic Framework.
Angew Chem Int Ed Engl
; 57(39): 12716-12720, 2018 Sep 24.
Article
en En
| MEDLINE
| ID: mdl-30094899
ABSTRACT
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 1276â
m2 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 0.5â
V), increased discharge voltage (by 0.5â
V), and extra 38.7 % battery efficiency.
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2018
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Article