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Intercalation of Lamellar Mineral Kaolinite with 2‐Picolinic Acid: Facile Preparation, Crystal Structure Optimization, and Proton Conductivity
Author(s) -
Huang XiaoQing,
Yang Hao,
Zhao ShunPing,
Liu JianLan,
Ren XiaoMing
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500550
Subject(s) - chemistry , kaolinite , picolinic acid , lamellar structure , thermogravimetric analysis , intercalation (chemistry) , proton , conductivity , anhydrous , infrared spectroscopy , activation energy , powder diffraction , crystal structure , inorganic chemistry , analytical chemistry (journal) , crystallography , nuclear chemistry , mineralogy , organic chemistry , physics , quantum mechanics
Kaolinite intercalated with 2‐picolinic acid was prepared and characterized by scanning electron microscopy, powder X‐ray diffraction, infrared spectroscopy, and thermogravimetric analysis. The proton conductivity ( σ ) of the material is 1.85 × 10 –10 S cm –1 at 353 K and gradually increases to 1.7 × 10 –7 S cm –1 at 393 K under N 2 (anhydrous environment) with an activation energy of E a = 1.93 eV, whereas σ = 1.56 × 10 –7 S cm –1 under 80 % relative humidity at 353 K with E a = 0.91 eV. The crystal structure optimized with the Cambridge Sequential Total Energy Package discloses the absence of a dense H‐bond network in the layer space of kaolinite, which explains the low proton conductivity and high proton transfer activation energy of the intercalated proton conductor.