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Ion-Exchange-Induced Selective Etching for the Synthesis of Amino-Functionalized Hollow Mesoporous Silica for Elevated-High-Temperature Fuel Cells

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- Title
- Ion-Exchange-Induced Selective Etching for the Synthesis of Amino-Functionalized Hollow Mesoporous Silica for Elevated-High-Temperature Fuel Cells
- Author/Creator
-
Zhang, Jin |
Liu, Jian |
Lu, Shanfu |
Zhu, Haijin |
Aili, David |
De Marco, R |
Xiang, Yan |
Forsyth, Maria |
Li, Qingfeng |
Jiang, S P
- Description
- As differentiated from conventional synthetic processes, amino-functionalized hollow mesoporous silica (NH2–HMS) has been synthesized using a new and facile strategy of ion-exchange-induced selective etching of amino-functionalized mesoporous silica (NH2-meso-silica) by an alkaline solution. Nuclear magnetic resonance (NMR) spectroscopy and in situ time-resolved small-angle X-ray scattering (SAXS) reveal that ion-exchange-induced selective etching arises from the gradient distribution of OH– in the NH2-meso-silica nanospheres. Moreover, the ion-exchange-induced selective etching mechanism is verified through a successful synthesis of hollow mesoporous silica. After infiltration with phosphotungstic acid (PWA), PWA–NH2–HMS nanoparticles are dispersed in the poly(ether sulfone)–polyvinylpyrrolidone (PES–PVP) matrix, forming a hybrid PWA–NH2–HMS/PES–PVP nanocomposite membrane. The resultant nanocomposite membrane with an optimum loading of 10 wt % of PWA–NH2–HMS showed an enhanced proton conductivity of 0.175 S cm–1 and peak power density of 420 mW cm–2 at 180 °C under anhydrous conditions. Excellent durability of the hybrid composite membrane fuel cell has been demonstrated at 200 °C. The results of this study demonstrated the potential of the facile synthetic strategy in the fabrication of NH2–HMS with controlled mesoporous structure for application in nanocomposite membranes as a technology platform for elevated-temperature proton exchange membrane fuel cells.
- Relation
- ACS Applied Materials and Interfaces / Vol. 9, No. 37, pp.31922-31930
- Relation
- http://dx.doi.org/10.1021/acsami.7b09591
- Year
- 2017
- Publisher
- American Chemical Society
- Subject
-
FoR 0904 (Chemical Engineering) |
FoR 0303 (Macromolecular and Materials Chemistry) |
FoR 0306 (Physical Chemistry (Incl. Structural)) |
proton exchange membrane fuel cells (PEMFCs) |
high-temperature proton exchange membranes (HT-PEMs) |
PES−PVP composite polymer |
amino-functionalized hollow mesoporous silica (NH2−HMS) |
phosphotungstic acid (PWA) |
ion-exchange-induced selective etching
- Resource Type
- Journal Article
- Identifier
- ISSN: 1944-8244
- Reviewed

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