01154nas a2200193   4500008004100000022001400041245009100055210006900146260011000215300001400325490000700339520038900346100001800735700001600753700002200769700003000791700001800821856012100839       2016                        eng d  a1359-734500aExploration of magnetically separable Ag@AgxNiy core/graded-alloy-shell nanostructures0 aExploration of magnetically separable AgAgxNiy coregradedalloysh  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUN  a8737-87400 v523 a<p>We report novel bimetallic Ag@AgxNiy core@graded-alloy-shell nanoparticles (CGAS NPs), i.e. single Ag core NPs shelled by an AgxNiy graded alloy and stabilized by the CTAB surfactant employing a novel synthesis method. These Ag@AgxNiy CGAS NPs demonstrated superior catalytic performance in the synthesis of biologically active 3-amino alkylated indoles under green conditions.</p>1 aKumar, Mukesh1 aSoni, Kiran1 aSatpati, Biswarup1 aGopinath, Chinnakonda, S.1 aDeka, Sasanka  uhttps://library.ncl.res.in/content/exploration-magnetically-separable-agagxniy-coregraded-alloy-shell-nanostructures02393nas a2200205   4500008004100000022001400041245012000055210006900175260000900244300001400253490000600267520164700273100002301920700001601943700002001959700002901979700003002008700001802038856013102056       2019                        eng d  a2050-748800aPromising visible-light driven hydrogen production from water on a highly efficient CuCo2S4 nanosheet photocatalyst0 aPromising visiblelight driven hydrogen production from water on   cMAR   a6985-69940 v73 a<p>Here we report the development of CuCo2S4 nanosheets (NSs) as a promising semiconductor photocatalyst for the first time for water splitting reactions under visible light ( 420 nm) conditions, without the support of any noble metal co-catalyst. These NSs were produced via a simple hydrothermal route and have desirable properties with a band gap of 2.24 eV, and are photo-catalytically active under visible light with an apparent quantum yield (AQY) of 2.48%. Under visible light, CuCo2S4 NSs exhibit excellent weight-normalized photoactivity that generates approximate to 25900 mol h(-1) H-2 for 1 g of material with sulphide + sulphite as the sacrificial agent under 7.68 mW cm(-2) illumination, which is the best evolution reported for any chalcogenide semiconductor material without any co-catalyst to date with unprecedented long-term operational stability (up to 12 h study time). The rate and number of hydrogen gas molecules produced are 8.2855 x 10(15) s(-1) cm(-2) which remained constant for three catalytic cycles with a turnover frequency (TOF) value of 0.017 s(-1). The effect of Cu substitution on photoactivity was also investigated for comparative studies and it was found that CuCo2S4 NSs show superior activity to Cu0.5Co2.5S4 and Co3S4. These CuCo2S4 NSs absorb the entire visible range of the spectrum from 420 to 800 nm, and have a highly populated density of states at the Fermi level and a high donor concentration of 7.22 x 10(18) cm(-3) which have been evaluated by Mott-Schottky analysis and favourable adsorption of H+ on S-sites and conversion to H-2 corroborate their efficient photocatalytic activity.</p>
1 aChauhan, Meenakshi1 aSoni, Kiran1 aKarthik, P., E.1 aReddy, Kasala, Prabhakar1 aGopinath, Chinnakonda, S.1 aDeka, Sasanka  uhttps://library.ncl.res.in/content/promising-visible-light-driven-hydrogen-production-water-highly-efficient-cuco2s4-nanosheet