S. Ogale

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James Elkins

School of the Art Institute of Chicago

Nicole Herbots

Arizona State University

Alberto Pimpinelli

Université Clermont Auvergne

Armando Marques-Guedes

UNL - New University of Lisbon

Virginie Boucher

CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)

Sefaattin Tongay

University of California, Berkeley

Prof.Dr. İbrahim USLU

Gazi University

Bryan M Wong

University of California, Riverside

Kiran Dasari

University of Illinois at Urbana-Champaign

Khaled Dine

University of Dr moulay taher

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Papers by S. Ogale

Hierarchically Nanoperforated Graphene as a High Performance Electrode Material for Ultracapacitors

by S. Ogale, Anil Suryawanshi, and Sreekuttan Unni

Small, 2013

High performance is reported for a symmetric ultracapacitor (UC) cell made up of hierarchically p... more High performance is reported for a symmetric ultracapacitor (UC) cell made up of hierarchically perforated graphene nanosheets (HPGN) as an electrode material with excellent values of energy density (68.43 Wh kg⁻¹) and power density (36.31 kW kg⁻¹). Perforations are incorporated in the graphite oxide (GO) and graphene system at room temperature by using silica nanoparticles as template. The symmetric HPGN-based UC cell exhibits excellent specific capacitance (Cs) of 492 F g⁻¹ at 0.1 A g⁻¹ and 200 F g⁻¹ at 20 A g⁻¹ in 1 M H₂SO₄ electrolyte. This performance is further highlighted by galvanostatic charge-discharge study at 2 A g⁻¹ over a large number (1000) of cycles exhibiting 93% retention of the initial Cs. These property features are far superior as compared to those of symmetric UC cells made up of only graphene nanosheets (GNs), i.e. graphene sheets without perforations. The latter exhibit Cs of only 158 F g⁻¹ at 0.1 A g⁻¹ and the cells is not stable at high current density.

Triple nanocomposites of CoMn2O4, Co3O4 and reduced graphene oxide for oxidation of aromatic alcohols

by S. Ogale, Anil Suryawanshi, Ajay Jha, and Narayan Biradar

Catalysis Science & Technology, 2014

A composite of reduced graphene oxide (RGO) with oxides of manganese and cobalt together was prep... more A composite of reduced graphene oxide (RGO) with oxides of manganese and cobalt together was prepared by a solvothermal method. During synthesis, both the reduction of graphene oxide as well as the growth of nanorod shaped CoMn 2 O 4 and Co 3 O 4 occurred simultaneously having a crystallite size of~8 nm calculated from X-ray diffraction (XRD). The as-obtained triple nanocomposite material designated as RGO-MnCoO exhibited excellent activity for the liquid phase aerobic oxidation of aromatic alcohols under base-free conditions selectively giving the corresponding aldehydes (>85%). RGO loading was varied in the range of 1-10%, among which 1% RGO-MnCoO showed maximum catalytic activity enhancement of 24% as compared to the bare mixed oxide (MnCo-MO) for the oxidation of vanillyl alcohol. HR-TEM of RGO-MnCoO revealed that it was a composite material having uniform nanotubes of~25 nm length and 6 nm diameter with a fringe pattern showing the and planes and lattice spaces of 0.26 nm and 0.22 nm, respectively, for the spinel CoMn 2 O 4 . The detailed studies on the morphology, size and composition of the as-prepared RGO-MnCoO nanocomposite by XRD, XPS, N 2 -adsorption/desorption and O 2 -TPD techniques were used to understand the role of RGO in the enhancement of catalytic activity for oxidation reaction.

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Large scale synthesis of graphene quantum dots (GQDs) from waste biomass and their use as an efficient and selective photoluminescence on–off–on probe for Ag + ions

by S. Ogale and Anil Suryawanshi

Nanoscale, 2014

Graphene quantum dots (GQDs) are synthesized from bio-waste and are further modified to produce a... more Graphene quantum dots (GQDs) are synthesized from bio-waste and are further modified to produce amine-terminated GQDs (Am-GQDs) which have higher dispersibility and photoluminescence intensity than those of GQDs. A strong fluorescence quenching of Am-GQDs (switch-off) is observed for a number of metal ions, but only for the Ag(+) ions is the original fluorescence regenerated (switch-on) upon addition of L-cysteine.

Indanthrone derived disordered graphitic carbon as promising insertion anode for sodium ion battery with long cycle life

by S. Ogale, Anil Suryawanshi, and Satyawan Nagane

Electrochimica Acta, 2014

Keywords: Na-ion battery anode disordered carbon indanthrone A B S T R A C T We report facile, on... more Keywords: Na-ion battery anode disordered carbon indanthrone A B S T R A C T We report facile, one step synthesis of disordered graphitic carbon by high temperature (1000 C) pyrolysis of indanthrone dye (ID). The pyrolysed carbon is disordered in nature and the same is clearly evidenced by various analytical techniques like X-ray diffraction, Raman spectroscopy and high resolution transmission electron microscopy. Na-insertion properties of such indanthrone dye derived disordered graphitic carbon (IDDGC) is evaluated in half-cell assembly (Na/IDDGC). The test cell delivered a reversible capacity of $160 mAh g À1 at current density of 25 mA g À1 . In addition, excellent cycling profiles are noted for such IDDGC, which retains $67% of initial reversible capacity after 500 cycles. The present study clearly highlights the importance of disorder in the graphitic carbon for efficient Na-ion storage.

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Starch (Tapioca) to carbon dots: an efficient green approach to an on-off-on photoluminescence probe for fluoride ion sensing

by Aniruddha Basu, Anil Suryawanshi, and S. Ogale

The Analyst, Jan 2, 2015

Photoluminescent carbon dots of 4-5 nm size were prepared from starch (Tapioca Sago) through a so... more Photoluminescent carbon dots of 4-5 nm size were prepared from starch (Tapioca Sago) through a solution method under mild conditions. The as-prepared carbon dots were used as photoluminescence probes for highly anion selective fluoride ion detection in aqueous solutions. A ready-to-use device is also demonstrated.

Doubling of photocatalytic H2 evolution from g-C3N4 via its nanocomposite formation with multiwall carbon nanotubes: Electronic and morphological effects

by S. Ogale and Anil Suryawanshi

International Journal of Hydrogen Energy, 2012

Visible-light water splitting a b s t r a c t Nanocomposite of graphitic carbon nitride (g-C 3 N ... more Visible-light water splitting a b s t r a c t Nanocomposite of graphitic carbon nitride (g-C 3 N 4 ) with optimum concentration of multiwall carbon nanotubes (MWCNTs) is shown to render 100% improvement in its photocatalytic activity for visible-light induced water splitting. Our study reveals that in addition to the charge transfer effects, morphological changes in g-C 3 N 4 introduced by mild MWCNT reinforcement play a vital role in the photocatalytic activity. We present results of structural and opto-electronic characterizations in support of these inferences.

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Concurrent synthetic control of dopant (nitrogen) and defect complexes to realize broadband (UV–650 nm) absorption in ZnO nanorods for superior photo-electrochemical performance

by Onkar Game, S. Ogale, Anil Suryawanshi, and Upendra Singh

Hierarchically Nanoperforated Graphene as a High Performance Electrode Material for Ultracapacitors

by S. Ogale, Anil Suryawanshi, and Sreekuttan Unni

Small, 2013