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... Reversible vapochromism in the NIR region is achieved for a mixed-valence platinum complex with lipid counterions, from which exclusion of crystallization water by organic vapor alters the lipid molecular orientation, which amplifies the information to changes in the 1D coordination structure and the electronic state. ...
platinum, etc ; biomass; biosorbents; biosorption; wastes; Show all 5 Subjects
Abstract:
... The increasing demand of rare earth elements and platinum group metals requires alternative approaches for their recycling from waste. Decades of fundamental laboratory research on biosorption area have emphasised that bio-based materials (biosorbents) display high and versatile potential of metal preconcentration. However, the transposition of this potential into successful practical strategies f ...
platinum, etc ; composite polymers; copolymerization; zinc; Show all 4 Subjects
Abstract:
... Acrylate monomers with metal complexes were designed to build polymer metal complexes. The ideal copolymerization of monomers with zinc and platinum was performed to obtain random copolymers with a feeding metal composition. The successful nano-colloid preparation from the polymers further highlighted the potential of the method for building multimetallic materials. ...
platinum, etc ; catalytic activity; iridium; osmium; rhodium; ruthenium; Show all 6 Subjects
Abstract:
... The synthesis and applications of nanoparticles formed from various platinum-group metals have been intensively investigated for many years because such systems have many important commercial applications, mainly as heterogeneous catalysts. Because of the very large number of data concerning nanoparticles of the platinum-group metals, in this review we focus only on nanoparticles formed from less ...
platinum, etc ; electrochemistry; enzymes; hydrogen peroxide; polyphenols; tea; Show all 6 Subjects
Abstract:
... To address the environmental hazards associated with traditional chemicals in fabricating metal nanoparticles, greener synthetic method using plant-derived material would be a good choice. In this study, platinum nanoparticles (Pt NPs) were greenly fabricated by tea polyphenol (Tp) and applied in hydrogen peroxide (H₂O₂) detection. As-prepared Pt NPs have been characterized by a series of analysis ...
platinum, etc ; alkali treatment; oxalic acid; pulp; temperature; wastes; Show all 6 Subjects
Abstract:
... Spent automotive catalytic converters are one of the fastest-growing waste streams that could be considered as a potential industrially demanded source of platinum group metals (PGMs), rare earth metals (REEs), and other critical elements. In this research, an integrated recycling approach was proposed based on the characteristics of the waste and its refractory nature. The proposed process focuse ...
platinum, etc ; alloys; catalytic activity; combustion; nanocrystals; palladium; propylene; steam; Show all 8 Subjects
Abstract:
... Low-temperature removal of noxious environmental emissions plays a critical role in minimizing the harmful effects of hydrocarbon fuels. Emission-control catalysts typically consist of large quantities of rare, noble metals (e.g., platinum and palladium), which are expensive and environmentally damaging metals to extract. Alloying with cheaper base metals offers the potential to boost catalytic ac ...
platinum, etc ; adsorption; catalysts; catalytic activity; fuel cells; hydrogen production; Show all 6 Subjects
Abstract:
... The water gas shift (WGS) reaction is a key process in the industrial hydrogen production and the development and application of the proton exchange membrane fuel cell. Metal oxide-supported highly dispersed Pt has been proved as an efficient catalyst for the WGS reaction. In this work, a series of supported 0.5Pt/xCe–10Ti (x = 1, 3, or 5) catalysts with different Ce/Ti molar ratios were prepared ...
platinum, etc ; catalysts; catalytic activity; chlorine; ethanol; gold; methanol; oxidation; Show all 8 Subjects
Abstract:
... The development of efficient and durable electrocatalysts is the only way to achieve commercial fuel cells. A new, efficient method was utilized for epitaxial growth of gold quantum dots using atomically platinum chlorine species with porous graphdiyne as a support (PtCl₂Au(111)/GDY), for obtaining successful multicomponent quantum dots with a size of 2.37 nm. The electrocatalyst showed a high mas ...
platinum, etc ; carbon; carbon nanotubes; catalysts; durability; electrochemistry; nanocomposites; pyrolysis; Show all 8 Subjects
Abstract:
... Pt-nanoparticle-supported graphene nanoplatelets (Pt/GNPs) and multiwalled carbon nanotube composite (Pt/MWCNTs) electrocatalysts for the oxygen reduction reaction (ORR) can be prepared using a one-pot method through the pyrolytic decomposition of the platinum precursor, platinum(ii) bis(acetylacetonate) (Pt(acac)₂) in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([C₄mim][Tf₂N]) o ...
platinum, etc ; adsorption; catalysts; desorption; dissociation; hydrogen production; oxygen; synergism; Show all 8 Subjects
Abstract:
... Seamless separation of intermediates (OHₐd and Hₐd) to different active sites at the atomic scale is realized on a Ni–O catalyst that is functionalized with low-coordinated oxygen and abundant vacancies. During alkaline hydrogen evolution reaction (HER), the former enables active states for Hₐd adsorption/desorption; meanwhile, nearby Niᵟ⁺ vacancies allow an optimal interaction with OHₐd. Conseque ...
Yu-Ping Ku; Konrad Ehelebe; Andreas Hutzler; Markus Bierling; Thomas Böhm; Andrea Zitolo; Mykhailo Vorokhta; Nicolas Bibent; Florian D. Speck; Dominik Seeberger; Ivan Khalakhan; Karl J. J. Mayrhofer; Simon Thiele; Frédéric Jaouen; Serhiy Cherevko
platinum, etc ; atomic absorption spectrometry; catalysts; durability; electrochemistry; electrodes; longevity; oxygen; Show all 8 Subjects
Abstract:
... The electrochemical activity of modern Fe–N–C electrocatalysts in alkaline media is on par with that of platinum. For successful application in fuel cells (FCs), however, also high durability and longevity must be demonstrated. Currently, a limited understanding of degradation pathways, especially under operando conditions, hinders the design and synthesis of simultaneously active and stable Fe–N– ...
Cassiano A. R. Bernardino; Claudio F. Mahler; Ricardo E. Santelli; Bernardo F. Braz; Renata C. Borges; Julia O. Fernandes; Anna C. S. Gomes; Fernando H. Cincotto; Luís A. B. Novo
platinum, etc ; automobiles; organic matter; pH; population density; roadsides; traffic; urbanization; Brazil; Show all 9 Subjects
Abstract:
... The contamination of soils due to traffic-related activities has been an ever-growing concern since the mid-20th century. This global issue impacts both rural soils often used for agriculture and grazing, and urban soils in densely populated urban areas. Therefore, this work aimed to evaluate the distribution of catalytic converters-related elements (Pd, Pt, Rh, Mo, and Ni) in roadside soils from ...
platinum, etc ; X-ray diffraction; catalysts; catalytic activity; cleavage (chemistry); phosphides; rhodium; Show all 7 Subjects
Abstract:
... To enhance the hydrodesulfurization (HDS) activity of SiO₂-supported Rh phosphide catalysts, various second metal-added Rh–P catalysts were developed; furthermore, the effect of the addition of the second metal on the HDS performance was examined. The second metals (M: Ru, Pt, and Ir) were selected as per the Sabatier principle. In situ X-ray diffraction revealed the formation of an Rh₂P phase in ...
platinum, etc ; carbon; catalytic activity; chemoselectivity; hydrogenation; nitroaromatic compounds; porous media; sulfur; Show all 8 Subjects
Abstract:
... Chemoselective hydrogenation of unsaturated organic compounds is a significant research topic in the catalysis field. Herein, a sulfur-doped ordered mesoporous carbon (SMC) material was prepared to anchor ultrafine platinum (Pt) clusters for the chemoselective hydrogenation of halogenated nitroarenes. The confinement effect of the ordered pores and the strong metal-support interaction caused by Pt ...
platinum, etc ; X-ray diffraction; carbon; lactams; ligands; moieties; organic chemistry; pyridines; Show all 8 Subjects
Abstract:
... Bowl-shaped aromatic molecules, buckybowls, are attractive molecules because of the unique properties derived from their curved-π scaffolds. Doping heteroatoms into buckybowl frameworks is a powerful method to change their structural and electronical properties. Herein, we report the synthesis of C₇₀ fragment buckybowl, homosumanene, and heterahomosumanenes having a lactone moiety and a lactam moi ...
platinum, etc ; catalysts; durability; electrolytes; hydrogen; hydrogen production; industrial applications; nitrides; reaction kinetics; Show all 9 Subjects
Abstract:
... Developing high-active electrocatalyst to improve the efficiency of hydrogen evolution reaction (HER) is critical to achieve clean hydrogen. However, the low mass activity and high cost of this technology still limits its wide commercial application. Herein, a new kind of hybrid material is designed by introducing trace Pt species onto a mixed metal nitride matrixs (denoted as NiWNₓ), presenting a ...
platinum, etc ; acetates; acetic acid; analytical chemistry; aqueous solutions; artificial intelligence; thermodynamics; voltammetry; Show all 8 Subjects
Abstract:
... Artificial intelligence (AI) is used to quantitatively analyze the voltammetry of the reduction of acetic acid in aqueous solution generating thermodynamic and kinetic data. Specifically, the variation of the steady-state current for the reduction of protons at a platinum microelectrode as a function of the bulk concentration of acetic acid is recorded and analyzed giving data in close agreement w ...
platinum, etc ; catalytic activity; electrodes; energy; hydrogen; hydrogen production; oxidation; reaction kinetics; synergism; Show all 9 Subjects
Abstract:
... The development of hydrogen energy is limited by the high cost of platinum group metals (PGM). There is an urgent need to design efficient PGM-free electrocatalysts in the hydrogen electrode. Herein, Janus Ni/W bimetallic materials are proposed as an effective PGM-free bifunctional hydrogen electrocatalyst. By constructing the bimetallic materials, a synergistic effect is realized to enhance the r ...
platinum, etc ; cancer therapy; carcinogenesis; colorectal neoplasms; curcumin; doxorubicin; drug therapy; immunostimulants; manganese; Show all 9 Subjects
Abstract:
... Metallodrug platinum compounds are indispensable components in the current standard combination for colorectal cancer treatment yet with severe additional adverse effects compromising the clinical outcomes. Having tumor microenvironment modulation and immunostimulatory effect, bio-compatible manganese (Mn) materials hold great promise for developing alternate metallodrug combination treatments. In ...