Direct Solar-to-Electrochemical Energy Storage in a Functionalized Covalent Organic Framework
Direct Solar-to-Electrochemical Energy Storage in a Functionalized Covalent Organic Framework
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功能化共价有机框架中的直接太阳能-电化学储能
DOI：
10.1002/anie.201806596
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发表时间：
2018-09-24
影响因子：
16.6
通讯作者：
Wang, Yaobing
中科院分区：
文献类型：
--
作者：
Lv, Jiangquan;Tan, Yan-Xi;Wang, Yaobing
提出了一种联结了萘二亚胺和三苯胺单元的共价有机骨架(NT-COF)。二维多孔纳米片具有1276m(2)g(-1)的高比表面积。光/电化学测量揭示了在NT-COF中从TPA到NDI的超高效分子内电荷转移和高度可逆的电化学反应。在NT-COF中，可逆电化学反应和分子内电荷转移之间存在协同效应，提高了太阳能效率，加速了电化学反应。这一协同机制为直接太阳能-电化学能量转换/储存提供了关键基础。以NT-COF为正极材料，实现了充电电压降低(0.5V)、放电电压提高(0.5V)，电池效率提高38.7%。
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.