Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 15, Pages 5011-5018Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202005474
Keywords
cobalt; conducting materials; organic– inorganic hybrid composites; metal– organic frameworks; postsynthetic modification
Categories
Funding
- National Natural Science Foundation [21671174]
- Thousand Talents Program of Zhongyuan
- Natural Science Foundation of Henan Province [182300410008]
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A 3D cobalt-based metal-organic framework with excellent electrical conductivity was synthesized, with its structure, stability, and conductivity successfully tuned through incorporating doped polyaniline and conducting ionic liquids.
A 3D Co-based metal-organic framework (Co-MOF) with two kinds of large pores filled by free Co2+ ions and ligands was synthesized and characterized. To expand the MOF structure and conductivity, the free Co2+ ions and ligands were exchanged by conductive ionic liquid EtpyBr and photosensitive AgNO3 through single crystal-to-single crystal transformation, which produced structure-changed 3D MOFs Co-MOF-Br and Co-Ag-MOF, which were characterized by single-crystal X-ray diffraction. Incorporating small quantities of doped polyaniline (PANI) with redox activity into the pores could further tune the stability and conductivity of the three MOFs. The PANI/MOFs all show outstanding electrical conductivity (approximate to 10(-2) S cm(-1)), and PANI/Co-MOF-Br has the largest p-type Seebeck coefficient of 66.6 mu V K-1. PANI/Co-MOF-Br and PANI/Co-Ag-MOF have 4 and 15 times higher photocurrent density compared with PANI/Co-MOF, respectively. This work sheds light on the design of advanced electrically conductive 3D MOFs.
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