Sentences with phrase «noble metal»

Instead of noble metal nanoparticles, they used single atoms of nickel.

A new concept might help to efficiently treat exhaust gases after the cold start of engines and in urban traffic and to reduce the consumption of expensive noble metal.

Large quantities of the expensive noble metal are still required for the electrodes in the fuel cells at which the chemical conversion processes take place.

«It had not been known that oxides can perform as well as noble metals as bifunctional catalysts,» said Lee.

«We show that our multivalent oxygen sponges can undergo such a redox process at as low as 200 degrees Celsius, which is comparable to the working temperature of noble metal catalysts,» Lee said.

A long - standing discrepancy between experimental and theoretical values for the lifetimes of holes in the surface - state electron bands on noble metal surfaces is resolved; previous determinations of both are found to have been in error.

Shikuan Yang explained: «First we need to use noble metal nanoparticles, like gold.

This innovation address the problem of efficiency degradation caused by decreased surface area associated with noble metal aggregation experienced in conventional catalysts.

Designed around the whole retractable hard top concept, the 488 Spider has a spaceframe chassis made of 11 different aluminium alloys combined with other noble metals such as magnesium, each one used in a highly specific way.

This synthesis route is capable of developing alternative catalysts of noble metals for many eco-friendly technologies such as fuel cell vehicles, hydrogen generation from water and CO2 reduction.

Designed around the concept of the retractable hard top, the 488 Spider has a spaceframe chassis made of 11 different aluminium alloys combined with other noble metals, such as magnesium, each one used in a highly specific way.

Electrons move freely through metals and sometimes begin to oscillate collectively on their surface under the effect of light, as in noble metals such as gold and silver.

These plasmons are essentially light waves trapped at the surface of nanoscale noble metal structures.

Yet, for all their varied uses, these alloys are complex, often containing five or six different elements, including expensive noble metals like gold or palladium.

However, the high costs of the scarce noble metals render their widespread application economically less viable.

A few noble metals, such as gold and platinum, can avoid HER and convert CO2 to CO; however, these metals are relatively rare and too expensive to serve as cost - efficient catalysts.

With a deep understanding of the mechanisms of electrode reactions in DMFCs, the researchers designed and produced noble metal - based heterogeneous electrocatalysts with enhanced catalytic activity and high selectivity for MOR and ORR.

The latest experiments from Strasser's research group indicate that substantial increases in efficiency may also be possible for the reaction splitting water to produce oxygen in electrolysers, for which the even more expensive noble metal iridium is used.

The researchers are using the device to study how soft - landed noble metal clusters modify carbon dioxide to upgrade this common pollutant to more valuable chemical feedstocks.

«Engineering Ordered and Nonordered Porous Noble Metal Nanostructures: Synthesis, Assembly, and Their Applications in Electrochemistry.»

In addition, more efficient burning helps to control the hydrocarbons in the exhaust gas and reduces the amount of noble metals needed for exhaust purification.

The highly dispersive LNT catalyst uses noble metal particles, such as platinum, microparticulated to approximately 40 % and arranged effectively.

Recent exhibitions include Inside the Garden at Smack Mellon (Brooklyn, 2018), Full Circle at the University of Washington's Henry Art Gallery (Seattle, 2017), and Noble Metal at Braverman Gallery (Tel Aviv, 2017).

Abundant metal - based molecular catalysts offer scalability, but only if they match noble metal activities.

In the development of fuel cells the effort of generations of scientist and engineers have led to efficient and stable catalysts based on noble metals.

As a result, a reduction in noble metals and stable exhaust emission control have become possible, enabling the use of a clean diesel engine compatible with the post-new long - term regulations in automatic transmission - equipped cars.

Noble metals such as platinum are useful as catalysts for versatile chemical reactions including fuel cell vehicles and reduction of CO2 emission.

Researchers have developed a new synthesis route for alternative catalysts of noble metals for versatile chemical reactions that could help address environmental concerns.

Porous nanosized structures that can hold platinum and other noble metals can be directly used in such a way as to circumvent the problems of today's carbon - supported catalysts.

According to research leader Bas de Bruin the concept of metallo - radical catalysis enables chemists to move away from the current use of expensive noble metal catalysts and use cheap metals instead.

We are now left with just eight candidates, the noble metals: platinum, palladium, rhodium, iridium, osmium, ruthenium, silver and gold.

TND Guest Contributor: Nathan McDonald Sprott Money Blog India, known for its close connection to precious metals and the value its citizens place on the noble metal, has always been one of the world's largest...

«The structure of the noble metal nanoparticles can be influenced by short - term modifications of the engine operation mode, for instance,» Gänzler says.

«The special thing is that we can adjust the size and state of the noble metal nanoparticles on the surface of the catalytic converter.

Based on the findings, current and future new types of catalytic converters can be improved and their economic efficiency can be increased, as the noble metal concentration can be reduced by up to 50 %.

«For this reason Hydrogenases are potentially interesting alternatives to noble metals,» says Prof. Dr. Wolfgang Schuhmann (Professorship for analytical chemistry at the RUB).

They developed just by using elements available to living organisms, that means without any noble metals.

«Perovskite oxides with strongly correlated electrons are robust under harsh chemical environments and fairly inexpensive compared to noble metal catalysts.»

The performance of the new catalyst was better than that of platinum, a noble metal that is known to excel at driving both oxygen evolution and reduction reactions.

«New synthesis route for alternative catalysts of noble metals.»

Gold is known as a noble metal because it is relatively unreactive.

«In this work, we discovered a highly active and stable electrocatalyst based on earth - abundant elements, which even outperforms the noble metal based ones,» she said.

Encouragingly, the DMFCs operated extremely well with high - concentration methanol as fuel by sufficiently making use of the structural uniqueness and electronic coupling effects among the different domains of the noble metal - based heterogeneous electrocatalysts.

Chen said oxygen evolution reactions often depend upon an electrocatalyst using a «noble metal» — iridium, platinum or ruthenium.

Although the metal phthalocyanine molecules do not react chemically with the noble metal gold, the gold's electrons sense the spin magnetic moments on the molecule and transmit this information to the neighbouring molecule.

The synthesis method also gives rise to the potential for new strategies for controlling the crystalline phase of nanomaterials made from the noble metals.

Although much progress has been made in recent years in the development of catalysts devoid of noble metals, photosensitizers still rely, in the main, on molecular compounds containing rare and costly metals, such as ruthenium and iridium, or on inorganic semiconductor materials containing cadmium, a toxic metal.