【摘 要】
：
The design of selective and efficient covalent organic frameworks(COFs)based electrocatalysts with tun-able morphology for efficient CO2 reduction reaction(CO2RR)to CH4 is highly desirable.Here,two kinds of anthraquinone-based COFs(i.e.,AAn-COF and OH-AAn
【机 构】
：
Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials,Jiangsu Key Laboratory of
论文部分内容阅读
The design of selective and efficient covalent organic frameworks(COFs)based electrocatalysts with tun-able morphology for efficient CO2 reduction reaction(CO2RR)to CH4 is highly desirable.Here,two kinds of anthraquinone-based COFs(i.e.,AAn-COF and OH-AAn-COF)with tunable 1D superstructures(e.g.,nanofibers(NF)and hollow tubes(HT))have been produced via Schiff-base condensation reaction.Interestingly,a rarely reported nanosheet-based self-template mechanism and a nanosheet-crimping mechanism have been demonstrated for the production of COF-based nanofibers and hollow tubes,respectively.Besides,the obtained COF-based superstructures can be post-modified with transition metals for efficient CO2RR.Specifically,AAn-COF-Cu(NF)and OH-AAn-COF-Cu(HT)exhibit superior faradaic-efficiency with CH4(FECH4)of 77％(-128.1 mA cm-2,-0.9 V)and 61％(-99.5 mA cmt-2,-1.0 V)in a flow-cell,respectively.Noteworthy,the achieved FECH4 of AAn-COF-Cu(NF)(77％)is the high-est one among reported crystalline COFs.This work provides a general methodology in exploring morphology-controlled COFs for electrocatalytic CO2RR.
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