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

Jin Zhang; Jian Liu; Shanfu Lu; Haijin Zhu; David Aili; Roland De Marco; Yan Xiang; Maria Forsyth; Qingfeng Li; San Ping Jiang

doi:10.1021/acsami.7b09591

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

Jin Zhang, Jian Liu, Shanfu Lu, Haijin Zhu, David Aili, Roland De Marco, Yan Xiang, Maria Forsyth, Qingfeng Li and San Ping Jiang

ACS Applied Materials and Interfaces, Vol.9(37), pp.31922-31930

2017

DOI: https://doi.org/10.1021/acsami.7b09591

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Abstract

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

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.

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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
Authors: Jin Zhang (Author) - Beihang University, China
Jian Liu (Author) - Curtin University
Shanfu Lu (Author) - Beihang University, China
Haijin Zhu (Author) - Deakin University
David Aili (Author) - Technical University of Denmark, Denmark
Roland De Marco (Author) - University of the Sunshine Coast
Yan Xiang (Author) - Beihang University, China
Maria Forsyth (Author) - Deakin University
Qingfeng Li (Author) - Technical University of Denmark, Denmark
San Ping Jiang (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: ACS Applied Materials and Interfaces, Vol.9(37), pp.31922-31930
Publisher: American Chemical Society
Date published: 2017
DOI: 10.1021/acsami.7b09591
ISSN: 1944-8244
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99450695302621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Nanoscience & Nanotechnology