Amorphous NH_(2)-MIL-68 as an efficient electro-and photo-catalyst for CO_(2)conversion reactions  

作　　者：Lifei Liu Jianling Zhang Xiuyan Cheng Mingzhao Xu Xinchen Kang Qiang Wan Buxing Han Ningning Wu Lirong Zheng Chenyan Ma 

机构地区：[1]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Colloid,Interface and Chemical Thermodynamics,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Beijing Synchrotron Radiation Facility(BSRF),Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2023年第1期181-188,共8页纳米研究（英文版）

基　　金：This research was made possible as a result of a generous grant from Ministry of Science and Technology of China(No.2017YFA0403003);the National Natural Science Foundation of China(No.22033009).

摘　　要：To produce metal-organic framework(MOF)catalysts with both high activity and durability is interesting but challenging.We report an amorphous MOF(NH_(2)-MIL-68),which combines the advantages of(1)a large number of open metal sites,(2)the basic building blocks and connectivity of crystalline NH_(2)-MIL-68,and(3)hierarchically meso-and microporous structure.It exhibits high performances in electrocatalytic reduction of CO_(2)and photochemical cycloaddition of CO_(2)under mild conditions.For the former reaction,the maximum Faradaic efficiency for product formic acid(FEHCOOH)reaches 93.3%with a current density of 34.2 mA·cm^(−2)at^(−2).05 V vs.Ag/Ag+catalyzed by amorphous NH_(2)-MIL-68,while the crystalline NH_(2)-MIL-68 shows FEHCOOH of 67.7%with considerable productions of CO and H_(2)at the same experimental conditions.For the photochemical cycloaddition of CO_(2)with styrene oxide,the yield by amorphous NH_(2)-MIL-68 can reach 94.1%at 12 h,which is higher than the reported value under similar conditions.The structure–efficiency relationship of the catalyst for the two reactions was investigated.This work opens up new possibility for designing high-performance MOF and MOF-based catalysts.

关 键 词：amorphous metal-organic framework ELECTROCATALYST PHOTOCATALYST defect engineering missing ligand incorporation 

分 类 号：O64[理学—物理化学]