02095nas a2200229 4500008004100000022001400041245009200055210006900147260007100216300001600287490000800303520124300311100002201554700002001576700002001596700002001616700002101636700002401657700002901681700002901710856012601739 2011 eng d a1932-744700aSelectivity tailoring in liquid phase oxidation over MWNT-Mn3O4 nanocomposite catalysts0 aSelectivity tailoring in liquid phase oxidation over MWNTMn3O4 n a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAUG a15440-154480 v1153 a

Highly selective multiwalled nanotubes (MWNT)-Mn3O4 nano-composite catalyst was designed for liquid phase oxidation of p-cresol, which gave highest selectivity of 90% to the first step oxidation product, p-hydroxy benzyl alcohol. Mn3O4 nanoparticles and MWNT-Mn3O4 nanocomposites were synthesized by coprecipitation route using mixed precursors under controlled conditions. The phase purity of Mn3O4 and the formation of MWNT-Mn3O4 nanocomposites were confirmed by X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. High-resolution transmission electron microscopy revealed the selective exposure of (101) and (001) planes of Mn3O4 nanoparticles in the MWNT-Mn3O4 composite, while lowering in oxidizing capacity of MWNT-Mn3O4 nanocomposite confirmed by cyclic voltametry was due to incorporation of electron rich MWNT. Thus, selectivity tuning of the new material (MWNT-Mn3O4 nanocomposite) was found to be due to alteration in both geometric as well as electronic properties. A plausible reaction pathway also has been proposed involving the predominant role of nucleophilic lattice oxygen (O2-) species due to exposure of particular crystal planes giving highest selectivity to p-hydroxy benzyl alcohol.

1 aBiswal, Mandakini1 aDhas, Vivek, V.1 aMate, Vivek, R.1 aBanerjee, Abhik1 aPachfule, Pradip1 aAgrawal, Kanika, L.1 aOgale, Satishchandra, B.1 aRode, Chandrashekhar, V. uhttps://library.ncl.res.in/content/selectivity-tailoring-liquid-phase-oxidation-over-mwnt-mn3o4-nanocomposite-catalysts-002280nas a2200241 4500008004100000022001400041245013700055210006900192260010600261300001200367490000800379520132200387653002801709653002201737653000901759653002101768100002401789700002201813700002401835700002501859700002501884856012901909 2014 eng d a0013-468600aElectronically and catalytically functional carbon cloth as a permeable and flexible counter electrode for dye sensitized solar cell0 aElectronically and catalytically functional carbon cloth as a pe aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAR a248-2530 v1233 a

In this work we demonstrate that a conducting carbon cloth obtained by one-step pyrolysis of easily available cellulose fabric competes favorably with the commonly employed expensive platinum/FTO system as a counter electrode for dye sensitized solar cell (DSSC). In view of the low carbonization temperature (1000 degrees C) which forbids full graphitization, the nature of carbon in this case is represented by topologically randomly assembled nanoscale graphene units (turbostratic carbon). This morphology has high density of edge states and oxygen containing surface groups rendering multitude of catalytic sites for the reduction of I-3(-). Moreover the cloth is permeable to the dye and/or liquid electrolyte and its absorption properties also help retain the electrolyte. A fairly high efficiency of 5.8% is achieved using such cloth as a counter electrode as against 7% with the conventional Pt/FTO system. Moreover, the permeable property of the cloth eliminates a complete step of drilling hard TCO substrates for final dispensing of electrolyte into the device and the sealing process is also facile. In fact even the dye can be dispensed through the cloth. Finally, the flexibility of the carbon cloth can adapt easily to flexible/wearable DSSC designs. (C) 2014 Elsevier Ltd. All rights reserved.

10aconducting carbon cloth10acounter electrode10aDSSC10awithout drilling1 aTathavadekar, Mukta1 aBiswal, Mandakini1 aAgarkar, Shruti, A.1 aGiribabu, Lingamallu1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/electronically-and-catalytically-functional-carbon-cloth-permeable-and-flexible-counter-001250nas a2200217 4500008004100000022001400041245016800055210006900223260000800292300001600300490000600316520043000322100002200752700002200774700002400796700001900820700001900839700001900858700002500877856013000902 2014 eng d a2040-336400aLarge 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+ ions0 aLarge scale synthesis of graphene quantum dots GQDs from waste b cMAR a11664-116700 v63 a

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.

1 aSuryawanshi, Anil1 aBiswal, Mandakini1 aMhamane, Dattakumar1 aGokhale, Rohan1 aPatil, Shankar1 aGuin, Debanjan1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/large-scale-synthesis-graphene-quantum-dots-gqds-waste-biomass-and-their-use-efficient-and02231nas a2200241 4500008004100000022001400041245013600055210006900191260000800260300001200268490000600280520141600286653001101702653001701713653001301730653002201743653001701765100002201782700002201804700001901826700002501845856011901870 2014 eng d a1864-563100aWater electrolysis with a conducting carbon cloth: subthreshold hydrogen generation and superthreshold carbon quantum dot formation0 aWater electrolysis with a conducting carbon cloth subthreshold h cMAR a883-8890 v73 a

A conducting carbon cloth, which has an interesting turbostratic microstructure and functional groups that are distinctly different from other ordered forms of carbon, such as graphite, graphene, and carbon nanotubes, was synthesized by a simple one-step pyrolysis of cellulose fabric. This turbostratic disorder and surface chemical functionalities had interesting consequences for water splitting and hydrogen generation when such a cloth was used as an electrode in the alkaline electrolysis process. Importantly, this work also gives a new twist to carbon-assisted electrolysis. During electrolysis, the active sites in the carbon cloth allow slow oxidation of its surface to transform the surface groups from COH to COOH and so forth at a voltage as low as 0.2V in a two-electrode system, along with platinum as the cathode, instead of 1.23V (plus overpotential), which is required for platinum, steel, or even graphite anodes. The quantity of subthreshold hydrogen evolved was 24mLcm(-2)h(-1) at 1V. Interestingly, at a superthreshold potential (>1.23V+overpotential), another remarkable phenomenon was found. At such voltages, along with the high rate and quantity of hydrogen evolution, rapid exfoliation of the tiny nanoscale (5-7nm) units of carbon quantum dots (CQDs) are found in copious amounts due to an enhanced oxidation rate. These CQDs show bright-blue fluorescence under UV light.

10aCarbon10aelectrolysis10aHydrogen10aphotoluminescence10aquantum dots1 aBiswal, Mandakini1 aDeshpande, Aparna1 aKelkar, Sarika1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/water-electrolysis-conducting-carbon-cloth-subthreshold-hydrogen-generation-and