01799nas a2200181   4500008004100000022001400041245012100055210006900176260000900245300001400254490000600268520112600274100002601400700001601426700003001442700001801472856012701490       2017                        eng d  a2044-475300aDiverse reactivity trends of Ni surfaces in Au@Ni core-shell nanoparticles probed by near ambient pressure (NAP) XPS0 aDiverse reactivity trends of Ni surfaces in AuNi coreshell nanop  cOCT   a4489-44980 v73 aA mild temperature sequential reduction method in aqueous medium is reported for the synthesis of Au@Ni nanoparticles with a core-shell morphology. The nickel shell thickness with a gold core in the nanostructure can be tuned from 2 nm up to about 10 nm. Near ambient pressure XPS (NAPXPS) studies under oxygen atmosphere show that Au-80@Ni-20 with an extremely thin nickel shell (similar to 2 nm) follows a distinctly different decomposition pathway of metastable Ni(OOH) species compared to those with larger shell thickness which behave more like individual nickel surfaces. Thus, Ni(OOH) on Au-80@Ni-20 decomposes to metallic Ni at 100 degrees C and is found to resist oxidation at 0.1 mbar oxygen at this temperature. Those with a larger nickel shell thickness behave more like monometallic Ni in terms of their decomposition and oxidation properties. The Au@Ni system with an ultra thin metallic nickel overlayer (2 nm) shows high catalytic activity and selectivity for phenylacetylene hydrogenation under mild conditions which outweighs their monometallic counterparts and those with higher nickel shell thickness.1 aBharathan, Vysakh, A.1 aJain, Ruchi1 aGopinath, Chinnakonda, S.1 aVinod, C., P.  uhttps://library.ncl.res.in/content/diverse-reactivity-trends-ni-surfaces-auni-core-shell-nanoparticles-probed-near-ambient