Zr(HPO4)(2) based organic/inorganic nanohybrids as new proton conductors

Xu, Zhi Ping, Jin, Yonggang, Diniz Da Costa, Joe C. and Lu, Gao Qing (Max) (2008) Zr(HPO4)(2) based organic/inorganic nanohybrids as new proton conductors. Solid State Ionics, 178 31-32: 1654-1659. doi:10.1016/j.ssi.2007.10.020

Author Xu, Zhi Ping
Jin, Yonggang
Diniz Da Costa, Joe C.
Lu, Gao Qing (Max)
Title Zr(HPO4)(2) based organic/inorganic nanohybrids as new proton conductors
Journal name Solid State Ionics   Check publisher's open access policy
ISSN 0167-2738
Publication date 2008-01-15
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.ssi.2007.10.020
Volume 178
Issue 31-32
Start page 1654
End page 1659
Total pages 6
Editor J. Maier
Place of publication Netherlands
Publisher Elsevier BV, North-Holland
Collection year 2009
Language eng
Subject C1
090404 Membrane and Separation Technologies
030302 Nanochemistry and Supramolecular Chemistry
030604 Electrochemistry
850401 Fuel Cells (excl. Solid Oxide)
Abstract In this study, sulfanilic acid was intercalated into an alpha-Zr(HPO4)(2) with the aim to enhance the proton conductivity via the acidic -SO3H groups. TGA results suggest that intercalation really takes place and a four-day reaction leads to the intercalation of 0.72 guest molecules (sulfanilic acids) per alpha-Zr(HPO4)(2). We find that the hybrid material undergoes three-step decomposition pathways: dehydration (40-150 degrees C), decomposition of benzene ring (150-470 degrees C), and finally de-SOx (470-1000 degrees C). The sulfanilic acid/alpha-Zr(HPO4)(2) hybrid shows a proton conductivity of 2.80 x 10(-3) S/cm, one order higher than the original alpha-Zr(HPO4)(2) (2.04 x 10(-4) S cm(-1)) measured at a relative humidity of 100% and 22 degrees C. The conductivity is strongly dependent on the relative humidity, and sharply increases at over 80% relative humidity. The activation energy for the proton transport in the hybrid is 0.33 and 0.15 eV at 60% and 100% relative humidity, respectively, in the temperature range of 22-100 degrees C, further reflecting the influence of humidity on the proton conduction.
Keyword proton conduction
zirconium phosphate
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Chemical Engineering Publications
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Created: Thu, 26 Mar 2009, 15:46:17 EST by Amanda Lee on behalf of School of Chemical Engineering