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Proton Conductivity of Naphthalene Sulfonate Formaldehyde Resin‐Doped Mesoporous Niobium and Tantalum Oxide Composites
Author(s) -
Turley Jonathan P.,
Romer Frederik,
Trudeau Michel L.,
Dias Marcos L.,
Smith Mark E.,
Hanna John V.,
Antonelli David M.
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402546
Subject(s) - materials science , conductivity , mesoporous material , thermogravimetric analysis , oxide , niobium oxide , tantalum , composite material , sulfonic acid , chemical engineering , chemistry , polymer chemistry , organic chemistry , catalysis , metallurgy , engineering
Proton conductivity in a series of mesoporous niobium and tantalum metal oxide (mX 2 O 5 ) composites of naphthalene sulfonic acid formaldehyde resin (NSF) that are resistant to moisture loss at temperatures greater than 50 °C is reported. The investigation focuses on the effect to proton conductivity by changing pore size and metal in the mesostructure of the mX 2 O 5 system and thus, a series of mX 2 O 5 ‐NSF composites were synthesized with C 6 , C 12 , and C 18 templates. These were characterized by XRD, thermogravimetric analysis, nitrogen adsorption, and scanning TEM and then studied using impedance spectroscopy to establish proton conductivity values at various temperatures ranging from 25 to 150 °C. The most promising sample displayed a conductivity of 21.96 mS cm −1 at 100 °C, surpassing the literature value for Nafion 117 (ca. 8 mS cm −1 ). 1 H and 13 C solid state NMR studies the mX 2 O 5 ‐NSF composites demonstrate that the oligomeric nature of the NSF is preserved while in contact with the mX 2 O 5 surface, thus facilitating conductivity.