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https://hdl.handle.net/2440/75797
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Type: | Journal article |
Title: | Hydrolytically stable phosphorylated hybrid silicas for proton conduction |
Author: | Jin, Y. Qiao, S. da Costa, J. Wood, B. Ladewig, B. Lu, G. |
Citation: | Advanced Functional Materials, 2007; 17(16):3304-3311 |
Publisher: | Wiley - VCH Verlag GmbH & Co |
Issue Date: | 2007 |
ISSN: | 1616-301X 1616-3028 |
Statement of Responsibility: | Yonggang Jin, Shizhang Qiao, João C. Diniz da Costa, Barry J. Wood, Bradley P. Ladewig, and Gao Qing Lu |
Abstract: | <jats:title>Abstract</jats:title><jats:p>A new approach to the synthesis of fully immobilized phosphorus functionalized hybrid proton conductive gels based on phosphonic acid grafting is presented in this paper. The hybrid silicas with different amounts of phosphonic acid have been prepared and characterized using Fourier‐transform infrared spectroscopy, X‐ray photoelectron spectroscopy, Brunauer–Emmett–Teller surface area analysis, thermogravimetric analysis, and electrochemical techniques. The proton conductivity of the materials depend strongly on hydration, which increases by four orders of magnitude over the relative humidity (RH) range of 20 to 100 %, up to a maximum of 0.027 S cm<jats:sup>–1</jats:sup> at 100 °C and 100 % RH. For the reported samples, proton conduction is believed to occur within a dynamic hydrogen‐bond network formed by functionalized P–OH groups and water molecules by the Grotthuss mechanism. However, the proton conductive sites (P–OH) are likely to be partially immobilized by strong protonic receptors (N atoms in amines), which reduces the free P–OH groups and restricts proton transfer. Hydration may cause a bonding structural rearrangement, which results in more free P–OH groups as active proton conductive sites and, therefore, greatly increased proton conductivity is observed.</jats:p> |
Keywords: | Hydrolytic stability Phosphorylated silicas Proton conduction |
Rights: | © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/adfm.200700350 |
Published version: | http://dx.doi.org/10.1002/adfm.200700350 |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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