Search results for: John P. Ferraris

Items from 1 to 20 out of 49 results

article

Fabrication of carbon nanofiber electrodes using poly(acrylonitrile-co-vinylimidazole) and their energy storage performance

Kyung-Hye Jung, So Jeong Kim, Ye Ji Son, John P. Ferraris

Carbon Letters > 2019 > 29 > 2 > 177-182

For electrodes in electrochemical double-layer capacitors, carbon nanofibers (CNFs) were prepared by thermal treatment of precursor polymer nanofibers, fabricated by electrospinning. Poly(acrylonitrile-co-vinylimidazole) (PAV) was employed as a precursor polymer of carbon nanofibers due to the effective cyclization of PAV polymer chains during thermal treatment compared to a typical precursor, polyacrylonitrile...

article

Amine-functionalized (Al) MIL-53/VTEC™ mixed-matrix membranes for H2/CO2 mixture separations at high pressure and high temperature

Edson V. Perez, Grace J.D. Kalaw, John P. Ferraris, Kenneth J. Balkus, more

Journal of Membrane Science > 2017 > 530 > C > 201-212

VTEC™ PI-1388 and 20wt% (Al) NH₂-MIL-53/VTEC™ PI-1388 mixed-matrix membranes (MMMs) with different thicknesses were tested for gas permeation of H₂ and CO₂ from 5 to 30bar and from 35 to 300°C. 50/50 H₂/CO₂ mixtures were also tested at 30bar and 250°C with stage cuts that ranged from 0.05 to 1. Gas permeation data show that the affinity of (Al) NH₂-MIL-53 for VTEC™ PI-1388 is strong enough to perform...

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Supercapacitors utilizing electrodes derived from polyacrylonitrile fibers incorporating tetramethylammonium oxalate as a porogen

Sahila Perananthan, Jeliza S. Bonso, John P. Ferraris

Carbon > 2016 > 106 > C > 20-27

Thermally sensitive tetramethylammonium oxalate (TMAO) is incorporated as an in situ porogen into freestanding nonwoven nanofibers of polyacrylonitrile (PAN) produced by electrospinning. Supercapacitor electrode materials are prepared by a series of thermal treatments on these fibers, including stabilization followed by a single step carbonization and CO₂ activation. The specific surface areas of...

article

In-situ synthesis of vanadium pentoxide nanofibre/exfoliated graphene nanohybrid and its supercapacitor applications

Arup Choudhury, Jeliza S. Bonso, Melissa Wunch, Kap Seung Yang, more

Journal of Power Sources > 2015 > 287 > C > 283-290

A novel nanohybrid material composed of vanadium pentoxide nanofibres (VNFs) and exfoliated graphene were prepared by in-situ growth of VNFs onto graphene nanosheets, and explicated as electrode material for supercapacitor applications. The existence of non-covalent interactions between VNFs and graphene surfaces was confirmed by Raman and Fourier transform infrared (FTIR) spectroscopes. Morphological...

article

Composite membranes with a highly selective polymer skin for hydrogen separation

Sumudu N. Wijenayake, Nimanka P. Panapitiya, Cindy N. Nguyen, Yu Huang, more

Separation and Purification Technology > 2014 > 135 > C > 190-198

This study reports the fabrication of a highly hydrogen selective cross-linked polymer skin on a highly permeable mixed matrix membrane. Selective polymer skins were prepared by spin coating a thin layer of 6FDA-durene polymer onto ZIF-8/6FDA-durene mixed matrix membranes followed by subsequent cross-linking of the 6FDA-durene layer with ethylene diamine (EDA) vapor. Resultant membrane yielded significantly...

article

MIL-53 frameworks in mixed-matrix membranes

Josephine O. Hsieh, Kenneth J. Balkus, John P. Ferraris, Inga H. Musselman

Microporous and Mesoporous Materials > 2014 > 196 > Complete > 165-174

The MIL-53 metal–organic framework (MOF) is known to change reversibly from an open-pore framework (MIL-53-ht) to a closed-pore framework (MIL-53-lt) depending on the temperature, pressure, or guest molecules absorbed. Three frameworks of the additive, MIL-53-as synthesized (MIL-53-as), MIL-53-ht, and MIL-53-lt, were prepared, characterized, and combined with Matrimid® to form mixed-matrix membranes...

article

Metal-organic polyhedra 18 mixed-matrix membranes for gas separation

Edson V. Perez, Kenneth J. Balkus, John P. Ferraris, Inga H. Musselman

Journal of Membrane Science > 2014 > 463 > Complete > 82-93

Crystals of highly soluble metal-organic polyhedra 18 (MOP-18) were synthesized and used as additives in Matrimid ^® 5218 to form mixed-matrix membranes. The MOP-18 linker was functionalized with long alkyl chains to help the crystals dissolve in common organic solvents. Scanning electron microscopy images revealed that the MOP-18 molecules do not aggregate into large particles even at loadings...

article

Stabilization of immiscible polymer blends using structure directing metal organic frameworks (MOFs)

Nimanka P. Panapitiya, Sumudu N. Wijenayake, Yu Huang, David Bushdiecker, more

Polymer > 2014 > 55 > 8 > 2028-2034

We have developed a novel approach for compatibilizing immiscible polymer blends using metal organic frameworks (MOFs). For the first time we demonstrated that the droplet diameter of the dispersed phase in a 1:1 immiscible polymer blend composed of 6FDA-DAM:DABA [copolymer of 4,4-hexafluoroisopropylidene diphthalic anhydride (6FDA), 2,4,6-trimethyl-1,3-phenylenediamine and 3,5-diaminobenzoic acid...

article

Manganese oxide nanorod–graphene/vanadium oxide nanowire–graphene binder-free paper electrodes for metal oxide hybrid supercapacitors

Sanjaya D. Perera, Mark Rudolph, Ruperto G. Mariano, Nour Nijem, more

Nano Energy > 2013 > 2 > 5 > 966-975

In this study MnO ₂ nanorodes (MNR) were fabricated on reduced graphene oxide (rGO) sheets using a facile hydrothermal synthesis route. As prepared binder free MNR-rGO electrodes exhibited promising electrochemical performance. A similar approach was employed to prepare V ₂ O ₅ nanowire (VNW) on rGO electrodes as anodes for supercapacitor applications. The VNW-rGO anode and...

article

Vanadium oxide nanowire – Graphene binder free nanocomposite paper electrodes for supercapacitors: A facile green approach

Sanjaya D. Perera, Anjalee D. Liyanage, Nour Nijem, John P. Ferraris, more

Journal of Power Sources > 2013 > 230 > Complete > 130-137

Vanadium oxide has attracted interest for energy storage applications due to its high theoretical capacitance and stable layered structure. The low electronic conductivity, of V ₂ O ₅ necessitates combining with conducting materials, typically carbon. However combining with conductive carbon materials may require binders, which compromise the active surface. In this study, V ₂...

article

Perfluorocyclobutyl (PFCB)-based polymer blends for proton exchange membrane fuel cells (PEMFCs)

Grace Jones D. Kalaw, Judy Anne N. Wahome, Yuanqin Zhu, Kenneth J. Balkus, more

Journal of Membrane Science > 2013 > 431 > Complete > 86-95

A phase-separated morphology, as observed in block copolymers, for proton exchange materials (PEM) is expected to result in improved PEM fuel cell performance. Blending hydrophilic and hydrophobic polymers provides an easier route to this phase-separated morphology especially for an otherwise difficult block copolymer synthesis. Blends of hydrophilic and hydrophobic perfluorocyclobutyl (PFCB) polymers...

article

Preparation and electrochemical properties of carbon nanofibers derived from polybenzimidazole/polyimide precursor blends

Kyung-Hye Jung, John P. Ferraris

Carbon > 2012 > 50 > 14 > 5309-5315

Carbon nanofibers (CNFs) were fabricated by thermal treatment of electrospun nanofibers obtained from precursor blends of polybenzimidazole (PBI) and Matrimid®. The microcarbon structures of CNFs obtained from PBI, and the 50:50 and 75:25 blends were studied using XRD and Raman spectra. Nitrogen adsorption/desorption measurements revealed that surface area and porosity of CNFs increased with an increase...

article

Alkaline deoxygenated graphene oxide for supercapacitor applications: An effective green alternative for chemically reduced graphene

Sanjaya D. Perera, Ruperto G. Mariano, Nour Nijem, Yves Chabal, more

Journal of Power Sources > 2012 > 215 > Complete > 1-10

Graphene is a promising electrode material for energy storage applications. The most successful method for preparing graphene from graphite involves the oxidation of graphite to graphene oxide (GO) and reduction back to graphene. Even though different chemical and thermal methods have been developed to reduce GO to graphene, the use of less toxic materials to generate graphene still remains a challenge...

article

Carbon nanofiber electrodes for supercapacitors derived from new precursor polymer: Poly(acrylonitrile-co-vinylimidazole)

Kyung-Hye Jung, Wenjin Deng, Dennis W. Smith, John P. Ferraris

Electrochemistry Communications > 2012 > 23 > Complete > 149-152

Carbon nanofibers were prepared using electrospinning and thermal treatment of a new precursor, poly(acrylonitrile-co-vinylimidazole). Raman spectroscopy confirmed carbonization. Steam activation resulted in high surface area of 1120m ² /g. Coin cells were assembled using ethylmethylimidazolium bis(trifluoromethylsulfonyl) imide (EMITFSI) as the electrolyte. Cyclic voltammetry showed classic...

article

Highly conductive, mesoporous carbon nanofiber web as electrode material for high-performance supercapacitors

Bo-Hye Kim, Kap Seung Yang, John P. Ferraris

Electrochimica Acta > 2012 > 75 > Complete > 325-331

Polyacrylonitrile/poly(methyl methacrylate) (PMMA) fibers containing graphene are prepared by the electrospinning method, and hierarchical porous carbon nanofibers (CNFs) are obtained after subsequent heat treatment. The hierarchical porous CNFs have an improved structure and properties because of the increased surface area, unique nanotexture and increased electrical conductivity due to the dispersion...

article

Exfoliated graphite nanoplatelets–V2O5 nanotube composite electrodes for supercapacitors

Jeliza S. Bonso, Abdelaziz Rahy, Sanjaya D. Perera, Nijem Nour, more

Journal of Power Sources > 2012 > 203 > Complete > 227-232

Exfoliated graphite nanoplatelet (xGnP) and V ₂ O ₅ nanotube (VNT) composite electrodes were fabricated and tested as electrodes for supercapacitors. Enhancement of the electrochemical performance of the composite over its component materials was demonstrated using cyclic voltammetry (CV), constant current charge/discharge testing and electrochemical impedance spectroscopy in aqueous...

article

Nafion-sulfonated dendrimer composite membranes for fuel cell applications

Anjalee D. Liyanage, John P. Ferraris, Inga H. Musselman, Duck-Joo Yang, more

Journal of Membrane Science > 2012 > 392-393 > Complete > 175-180

Novel proton conducting composite membranes were synthesized by blending Nafion ^® polymer with sulfonated organosilicon dendrimers (G3-S). Blending G3-S with Nafion resulted in stable, flexible membranes with loadings up to 10% by weight. The high amount of sulfonic acid groups on the dendrimer increased the ion exchange capacity and improved the water retention capability of the composite...

article

Vanadium Oxide Nanotube Spherical Clusters Prepared on Carbon Fabrics for Energy Storage Applications

Sanjaya D. Perera, Bijal Patel, Jeliza Bonso, Max Grunewald, more

ACS Applied Materials & Interfaces > 2011 > 3 > 11 > 4512 - 4517

article

Molecular sieving realized with ZIF-8/Matrimid® mixed-matrix membranes

Ma. Josephine C. Ordoñez, Kenneth J. Balkus, John P. Ferraris, Inga H. Musselman

Journal of Membrane Science > 2010 > 361 > 1-2 > 28-37

Zeolitic imidazolate frameworks (ZIFs), that have the potential for gas separation, were used as additives in mixed-matrix membranes (MMMs). ZIF-8, which exhibits the sodalite topology, is composed of zinc (II) ion clusters linked by imidazolate ligands. The ZIF-8 pore aperture is 3.4Å allowing it to readily absorb small molecules such as H ₂ and CO ₂ . ZIF-8/Matrimid ^® MMMs...

article

Harvesting Waste Thermal Energy Using a Carbon-Nanotube-Based Thermo-Electrochemical Cell

Renchong Hu, Baratunde A. Cola, Nanda Haram, Joseph N. Barisci, more

Nano Letters > 2010 > 10 > 3 > 838 - 846

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Search results for: John P. Ferraris

Fabrication of carbon nanofiber electrodes using poly(acrylonitrile-co-vinylimidazole) and their energy storage performance

Amine-functionalized (Al) MIL-53/VTEC™ mixed-matrix membranes for H2/CO2 mixture separations at high pressure and high temperature

Supercapacitors utilizing electrodes derived from polyacrylonitrile fibers incorporating tetramethylammonium oxalate as a porogen

In-situ synthesis of vanadium pentoxide nanofibre/exfoliated graphene nanohybrid and its supercapacitor applications

Composite membranes with a highly selective polymer skin for hydrogen separation

MIL-53 frameworks in mixed-matrix membranes

Metal-organic polyhedra 18 mixed-matrix membranes for gas separation

Stabilization of immiscible polymer blends using structure directing metal organic frameworks (MOFs)

Manganese oxide nanorod–graphene/vanadium oxide nanowire–graphene binder-free paper electrodes for metal oxide hybrid supercapacitors

Vanadium oxide nanowire – Graphene binder free nanocomposite paper electrodes for supercapacitors: A facile green approach

Perfluorocyclobutyl (PFCB)-based polymer blends for proton exchange membrane fuel cells (PEMFCs)

Preparation and electrochemical properties of carbon nanofibers derived from polybenzimidazole/polyimide precursor blends

Alkaline deoxygenated graphene oxide for supercapacitor applications: An effective green alternative for chemically reduced graphene

Carbon nanofiber electrodes for supercapacitors derived from new precursor polymer: Poly(acrylonitrile-co-vinylimidazole)

Highly conductive, mesoporous carbon nanofiber web as electrode material for high-performance supercapacitors

Exfoliated graphite nanoplatelets–V2O5 nanotube composite electrodes for supercapacitors

Nafion-sulfonated dendrimer composite membranes for fuel cell applications

Vanadium Oxide Nanotube Spherical Clusters Prepared on Carbon Fabrics for Energy Storage Applications

Molecular sieving realized with ZIF-8/Matrimid® mixed-matrix membranes

Harvesting Waste Thermal Energy Using a Carbon-Nanotube-Based Thermo-Electrochemical Cell

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