Carbon-supported bimetallic Pt-Co cathode catalysts have been previously identified as higher activity alternatives to conventional Pt/C catalysts for fuel cells. In this work, a series of Pt-Co/C catalysts were synthesized using electroless deposition (ED) of Pt on a Co/C catalyst prepared by modified charge enhanced dry impregnation. X-ray diffraction (XRD) and scanning transmission electron ...

More than a decade’s worth of research has led to significant progress toward an understanding of the growth behavior of nanowires (NWs). Among all of the different bottom-up and top-down strategies, vapor deposition has unique advantages in producing high quality NW structures. This paper reviews the current understandings of the thermodynamics and kinetics of NW nucleation and growth behavior...

A model for III-V nanowire (NW) growth in molecular beam epitaxy (MBE) is developed, which describes the NW by surface diffusion of adatoms influenced shadowing effect. It shown that effect strongly influences kinetics dense ensembles NWs. new solution length as a function its radius and deposition thickness obtained. comparison given theoretical experimental lengths InP NWs grown on either ads...

The shapes of as-grown/as-etched two-dimensional (2D) islands are the most recognizable features chemical vapor deposition (CVD) process which reveal a lot information about environment growth/etching, effect substrate and growth/etching kinetics. Here, we summarize experimentally observed CVD-grown 2D materials from previous reports, theoretical understanding on corresponding mechanisms simula...

Interfacial deposition stability at the Li-metal-solid electrolyte interface in all solid-state batteries is governed by stress-transport-electrochemistry coupling conjunction with polycrystalline/amorphous solid architecture. In this work, we delineate optimal microstructure comprising grains, grain boundaries, and voids possessing desirable ionic conductivity elastic modulus for superior tran...

There is a growing recognition that accurate predictions of plant and ecosystem responses to global change require a better understanding of the mechanisms that control acquisition of growth-limiting resources. One such key mechanism is root physiological capacity to acquire nutrients. Changes in kinetics of root nitrogen (N) uptake might influence the extent to which terrestrial ecosystems wil...

Capture numbers are used in models of nucleation and growth on surfaces, and have been widely applied to predict nucleation densities and other quantities via rate equations. In conventional nucleation theory, much effort has historically been expended on obtaining good expressions for capture numbers in the diffusionlimited case. However, recent experiments and calculations have shown that wea...

the purpose of this study was to investigate the deposition of the hydroxyapatite (ha) coating via the electrophoresis procedure. the ha deposition was performed in an ethanol, methanol, acetone and isopropanol suspension. methanol was found to be the best deposition media. among the different environmental conditions, including the encapsulation of the samples under two vacuum types of pressur...

The influence of the lattice strain on the kinetics of the oxygen reduction reaction (ORR) was investigated at the surface of Nd2NiO4+δ (NNO). Nanoscale dense NNO thin films with tensile, compressive and no strain along the c-axis were fabricated by pulsed laser deposition on single-crystalline Y0.08Zr0.92O2 substrates. The ORR kinetics on the NNO thin film cathodes was investigated by electroc...

The proposed work will combine chemical kinetics and hydrodynamics in target and test-loop lead-bismuth eutectic (LBE) systems to model system corrosion effects. This approach will result in a predicative tool that can be validated with corrosion test data, used to systematically design tests and interpret the results, and provide guidance for optimization in LBE system designs. The task includ...