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Noble metal
About: Noble metal is a research topic. Over the lifetime, 15113 publications have been published within this topic receiving 337947 citations.
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TL;DR: In the last decade, metallic nanoparticles of noble metal ions as gold and silver have received much attention mainly due to their colorimetric properties as mentioned in this paper, and these metallic functionalised nanoparticles offered an enormous possibility of applications in many scientific and technical fields.
Abstract: In the last decade, metallic nanoparticles of noble metal ions as gold and silver have received much attention mainly due to their colorimetric properties. These metallic functionalised nanoparticles offered an enormous possibility of applications in many scientific and technical fields. As hybrid materials combining large surfaces with important optic and electronic properties demonstrate to be highly sensitive to the presence of metal ions in their surroundings. Special attention has being paid to the applications of gold, silver and alloys nanoparticles as fluorescent and/or colorimetric systems for detection of metals, mainly in the presence of heavy and toxic metal ions. In the present review we have focused on the advances and novelties reported in the field during the last 5 years.
121 citations
TL;DR: A series of NiO/CeO2 catalysts were prepared by using the combustion method and characterized by using XRD, N2-physisorption, TEM, UV-visible, Raman, XPS, ICP-OES and H2-TPR as discussed by the authors.
121 citations
TL;DR: Here, the focus is on NA materials for chemical catalysis (except photocatalysis or electrocatalysis), and the design and fabrication for the optimization of catalytic performance are systematically summarized.
Abstract: Nanoalloys (NAs), which are distinctly different from bulk alloys or single metals, take on intrinsic features including tunable components and ratios, variable constructions, reconfigurable electronic structures, and optimizable performances, which endow NAs with fascinating prospects in the catalysis field. Here, the focus is on NA materials for chemical catalysis (except photocatalysis or electrocatalysis). In terms of composition, NA systems are divided into three groups, noble metal, base metal, and noble/base metal mixed NAs. Their design and fabrication for the optimization of catalytic performance are systematically summarized. Additionally, the correlations between the composition/structure and catalytic properties are also mentioned. Lastly, the challenges faced in current research are discussed, and further pathways toward their development are suggested.
121 citations
TL;DR: The total hydrodeoxygenation of carbohydrate-derived molecules to alkanes, a key reaction in the production of biofuel, was reviewed from the aspect of catalysis.
Abstract: The total hydrodeoxygenation of carbohydrate-derived molecules to alkanes, a key reaction in the production of biofuel, was reviewed from the aspect of catalysis. Noble metals (or Ni) and acid are the main components of the catalysts, and group 6 or 7 metals such as Re are sometimes added as modifiers of the noble metal. The main reaction route is acid-catalyzed dehydration plus metal-catalyzed hydrogenation, and in some systems metal-catalyzed direct CO dissociation is involved. The appropriate active metal, acid strength, and reaction conditions depend strongly on the reactivity of the substrate. Reactions that use Pt or Pd catalysts supported on Nb-based acids or relatively weak acids are suitable for furanic substrates. Carbohydrates themselves and sugar alcohols undergo CC dissociation easily. The systems that use metal-catalyzed direct CO dissociations can give a higher yield of the corresponding alkane from carbohydrates and sugar alcohols.
121 citations
TL;DR: In this article, hierarchically porous nitrogen and phosphorus codoped carbon nanofibers directly grown on conductive carbon paper are prepared through an electrochemically induced polymerization process in the presence of aniline monomer and phosphonic acid.
Abstract: Developing earth-abundant and active electrocatalysts for the oxygen evolution reaction (OER) as replacements for conventional noble metal catalysts is of scientific and technological importance for achieving cost-effective and efficient conversion and storage of renewable energy. However, most of the promising candidates thus far are exclusively metal-based catalysts, which are disadvantaged by relatively restricted electron mobility, corrosion susceptibility, and detrimental environmental influences. Herein, hierarchically porous nitrogen (N) and phosphorus (P) codoped carbon nanofibers directly grown on conductive carbon paper are prepared through an electrochemically induced polymerization process in the presence of aniline monomer and phosphonic acid. The resultant material exhibits robust stability (little activity attenuation after 12 h continuous operation) and high activity with low overpotential (310 mV at 10 mA cm(-2)) toward electrocatalytic oxygen production, with performance comparable to that of the precious iridium oxide (IrO2) benchmark. Experimental measurements reveal that dual doping of N and P can result in an increased active surface area and abundant active sites in comparison with the single doped and pristine carbon counterparts, and density functional theory calculations indicate that N and P dopants can coactivate the adjacent C atoms, inducing synergistically enhanced activity toward OER.
121 citations