Atomic hydrogen adsorption energies on bimetallic overlayer systems have been determined by periodic density functional theory calculations within the generalized gradient approximation. On the pseudomorphic Pd/Cu(111) surface, both the substrate interaction and the lattice compression of the Pd overlayer lead to smaller hydrogen binding energies. For pseudomorphic Cu/Pd(111), on the hand, the ...

The adsorption and thermal activation of copper(I)-N,N0-di-sec-butylacetamidinate on a Ni(110) single-crystal surface were characterized in connection with the use of that compound as a precursor for the growth of copper films via atomic layer deposition (ALD) processes. Studies were carried out under ultrahigh vacuum (UHV) conditions by using a combination of X-ray photoelectron spectroscopy (...

Expectations for hydrogen as a clean substitute of fossil fuels can be met in very near future, driven by the inevitable energy transition towards decarbonized economy. The green technology will play fundamental role transport, residential uses and, relevant way, industrial sector. This work aims to carry out an updated review possibilities sector achieve objectives and identify both opportunit...

Photocatalytic water splitting is a natural but challenging chemical way of harnessing renewable solar power to generate clean hydrogen energy. Here we report a potential hydrogen-evolving photochemical molecular device based on a self-assembled ruthenium-palladium heterometallic coordination cage, incorporating multiple photo- and catalytic metal centres. The photophysical properties are inves...

The recovery of clean energy in the form of methane-containing biogas is starting to receive tremendous attention in South Africa. However, it is unclear whether the transition from standard bio-methane production to waste-based bio-hydrogen production would improve or worsen the environmental and energetic performance as quantified by Life Cycle Assessment (LCA). The results of this study show...

Depletion of fossil fuels and environmental considerations have led engineers and scientists to anticipate the need to develop a clean, renewable and sustainable energy system. In general, they agree that in such a system hydrogen will be used as an energy carrier. One of the areas in which hydrogen will be replacing fossil fuels is air transportation, an area that has been under research for s...

Hydrogen adsorption on the InP (001)-(231) reconstruction has been characterized by vibrational spectroscopy and ab initio calculations with density functional theory. The (231) surface is covered with a complete layer of phosphorus dimers. The clean and hydrogen-terminated dimers have been modeled by In5P4Hx clusters with the proper number of covalent and dative bonds to accurately represent t...

Two-dimensional Fermi contours of clean and hydrogen-induced surface electronic states have been systematically measured vs coverage of H on W(110) using angle-resolved photoemission. We observe a new pair of spin-orbit-interaction-split surface states, whose splitting grows systematically with hydrogen coverage and whose Fermi contours are strongly nested due to their opposing curvatures. Mome...

Based on our integrated approach linking detailed process simulation with LCA, we are able to quantify benefits and potential trade-offs of clean hydrogen production in a consistent way.

Hydrogen is one of the prospective clean energies that could potentially address two pressing areas global concern, namely energy crises and environmental issues. Nowadays, fossil-based technologies are widely used to produce hydrogen release higher greenhouse gas emissions during process. Decarbonizing planet has been major goals in recent decades. To achieve this goal, it necessary find clean...