Yina Guo

Abstract: Single-site heterogeneous catalysis with isolated Pd atoms was reported earlier, mainly for oxidation reactions and for Pd catalysts supported on oxide surfaces. In the present work, we show that single Pd atoms on nitrogen-functionalized mesoporous carbon, observed by aberration-corrected scanning transmission electron microscopy (ac STEM), contribute significantly to the catalytic activity for hydrogen production from vapor-phase formic acid decomposition, providing an increase by 2–3 times in comparison to Pd catalysts supported on nitrogen-free carbon or unsupported Pd powder. Some gain in selectivity was also achieved. According to X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) studies after ex situ reduction in hydrogen at 573 K, these species exist in a Pd2+ state coordinated by nitrogen species of the support. Extended density functional theory (DFT) calculations confirm that an isolated Pd atom can be the active site for the reaction, giving decompos...

TL;DR: The formation of Cu2SnSe3 tetrapod nanocrystals is reported using a hot injection colloidal synthesis and the ternary copper chalcogenide nanocry crystals nucleate with a cubic core with four short wurzite arms.

TL;DR: In all catalysts derived from Pd acetate, metal particles visible by conventional TEM had similar sizes, but the adsorption capacity towards CO responded strongly to N-doping of the carbon surface, and a decrease in the CO/Pd values was accompanied by a significant increase in the reaction rate.

TL;DR: In this paper, a novel cryogenic treatment was proposed to reduce residual stresses induced during quenching of aluminum alloys by using a hole drilling strain gauge method, and the results showed that this treatment can relieve up to 71% of the residual stresses compared to 29% related to the traditional cold water as the reheating medium.

TL;DR: The extraction of cell surface proteins from R. oryzae using common detergents and reducing agent and their effect on the size and shape of the biosynthetic AuNPs are explored, finding them suitable for biomedical applications.