title: Nanoparticles of mesoporous SO3H-functionalized Si-MCM-41 with superior proton conductivity.
abstract: Nanometer-sized mesoporous silica particles of around 100-nm diameter functionalized with a large amount of sulfonic acid groups are prepared using a simple and fast in situ co-condensation procedure. A highly ordered hexagonal pore structure is established by applying a pre-hydrolysis step in a high-dilution synthesis approach, followed by adding the functionalization agent to the reaction mixture. The high-dilution approach is advantageous for the in situ functionalization since no secondary reagents for an effective particle and framework formation are needed. Structural data are determined via electron microscopy, nitrogen adsorption, and X-ray diffraction, proton conductivity values of the functionalized samples are measured via impedance spectroscopy. The obtained mesoporous SO(3)H-MCM-41 nanoparticles demonstrate superior proton conductivity than their equally loaded micrometer-sized counterparts, up to 5 x 10(-2) S cm(-1). The mesoporosity of the particles turns out to be very important for effective proton transport since non-porous silica nanoparticles exhibit worse efficient proton transport, and the obtained particle size dependence might open up a new route in rational design of highly proton conductive materials.
authors.affiliation: Institut für Physikalische Chemie und Elektrochemie, Gottfried Wilhelm Leibniz Universität Hannover, Callinstrasse 3A, 30167 Hannover, Germany.
authors.forename: Roland
authors.initials: R
authors.lastname: Marschall
authors.forename: Inga
authors.initials: I
authors.lastname: Bannat
authors.forename: Armin
authors.initials: A
authors.lastname: Feldhoff
authors.forename: Lianzhou
authors.initials: L
authors.lastname: Wang
authors.forename: Gao Qing Max
authors.initials: GQ
authors.lastname: Lu
authors.forename: Michael
authors.initials: M
authors.lastname: Wark
mesh_terms: D004553:Electric Conductivity; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D016062:Porosity; D011522:Protons; D012822:Silicon Dioxide / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: C509968:MCM-41; D011522:Protons; D012822:Silicon Dioxide