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Promotion of Proton Conductivity by Encapsulation of Metal‐Organic Polyhedra in Metal‐Organic Frameworks
Author(s) -
Wang BinCheng,
Feng ZhiYing,
Hao BiaoBiao,
Zhang ChenXi,
Wang QingLun
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101213
Subject(s) - metal organic framework , conductivity , materials science , thermal conduction , proton , polyhedron , metal , porosity , chemical engineering , composite material , chemistry , metallurgy , organic chemistry , engineering , mathematics , physics , geometry , adsorption , quantum mechanics
A Zr‐based metal‐organic polyhedron (MOP) was self‐assembled in a porous MOF host, DUT‐68, successfully to synthesize MOP‐1@DUT‐68. The MOP guest (MOP‐1) has a diameter of about 20 Å, larger than that of the square windows (pore sizes of ∼14 Å) of DUT‐68 but smaller than that of the rhombicuboctahedral cage (27.7 Å), which means that the migration and leaching of MOP‐1 could be effectively prohibited if MOP‐1 is encapsulated in the MOF′s cavities. The proton conductivity of MOP‐1@DUT‐68 is 1.14×10 −3 S cm −1 (at 80 °C under 98 % relative humidity), which is three orders of magnitude higher than that of DUT‐68. Compared with MOP‐1⊂DUT‐68, which was synthesized by impregnation, MOP‐1@DUT‐68 is more prone to form faster proton‐conduction pathways and thus provides higher proton conductivity.