File(s) under permanent embargo
Ion-exchange-induced selective etching for the synthesis of amino-functionalized hollow mesoporous silica for elevated-high-temperature fuel cells
journal contribution
posted on 2017-09-20, 00:00 authored by Jin Zhang, Jian Liu, Shanfu Lu, Haijin Zhu, David Aili, Roland De Marco, Yan Xiang, Maria ForsythMaria Forsyth, Qingfeng Li, San Ping JiangAs 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.
History
Journal
ACS applied materials and interfacesVolume
9Issue
37Pagination
31922 - 31930Publisher
ACS PublicationsLocation
Washington, D.C.Publisher DOI
eISSN
1944-8252Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, American Chemical SocietyUsage metrics
Categories
No categories selectedKeywords
PES−PVP composite polymeramino-functionalized hollow mesoporous silica (NH2−HMS)high-temperature proton exchange membranes (HT-PEMs)ion-exchange-induced selective etchingphosphotungstic acid (PWA)proton exchange membrane fuel cells (PEMFCs)Science & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials SciencePES-PVP composite polymeramino-functionalized hollow mesoporous silica (NH2-HMS)INTRACELLULAR CONTROLLED-RELEASEORDERED RADIAL MESOCHANNELSFACILE SYNTHESISACIDMEMBRANESSPHERESSHELLNANOPARTICLESCONDUCTIVITYELECTROLYTE
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC