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

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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
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