The role and fate of capping ligands in colloidally prepared metal nanoparticle catalysts

2018 ◽  
Vol 47 (17) ◽  
pp. 5889-5915 ◽  
Author(s):  
Liane M. Rossi ◽  
Jhonatan L. Fiorio ◽  
Marco A. S. Garcia ◽  
Camila P. Ferraz
Keyword(s):  
Rational Design ◽  
Metal Nanoparticle ◽  
Partial Removal ◽  
Nanoparticle Catalysts ◽  
Capping Ligands

In this Perspective article, we highlight emerging opportunities for the rational design of catalysts upon the choice, exchange, partial removal or pyrolysis of ligands.

scholarly journals Transition-Metal Nanoparticle Catalysts Anchored on Carbon Supports via Short-Chain Alginate Linkers

2021 ◽  
Author(s):  
Joakim Tafjord ◽  
Erling Rytter ◽  
Anders Holmen ◽  
Rune Myrstad ◽  
Ingeborg-Helene Svenum ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Nanoparticle ◽  
Short Chain ◽  
Carbon Supports ◽  
Nanoparticle Catalysts

scholarly journals Polymer-supported CuPd nanoalloy as a synergistic catalyst for electrocatalytic reduction of carbon dioxide to methane

2015 ◽  
Vol 112 (52) ◽  
pp. 15809-15814 ◽  
Author(s):  
Sheng Zhang ◽  
Peng Kang ◽  
Mohammed Bakir ◽  
Alexander M. Lapides ◽  
Christopher J. Dares ◽  
...  
Keyword(s):  
State Of The Art ◽  
Metal Nanoparticle ◽  
Local Concentration ◽  
Electrocatalytic Reduction ◽  
Catalytic Current ◽  
Faradaic Efficiency ◽  
Nanoparticle Catalysts ◽  
Ultrafine Metal ◽  
Current Densities ◽  
Energy Strategies

Developing sustainable energy strategies based on CO2 reduction is an increasingly important issue given the world’s continued reliance on hydrocarbon fuels and the rise in CO2 concentrations in the atmosphere. An important option is electrochemical or photoelectrochemical CO2 reduction to carbon fuels. We describe here an electrodeposition strategy for preparing highly dispersed, ultrafine metal nanoparticle catalysts on an electroactive polymeric film including nanoalloys of Cu and Pd. Compared with nanoCu catalysts, which are state-of-the-art catalysts for CO2 reduction to hydrocarbons, the bimetallic CuPd nanoalloy catalyst exhibits a greater than twofold enhancement in Faradaic efficiency for CO2 reduction to methane. The origin of the enhancement is suggested to arise from a synergistic reactivity interplay between Pd–H sites and Cu–CO sites during electrochemical CO2 reduction. The polymer substrate also appears to provide a basis for the local concentration of CO2 resulting in the enhancement of catalytic current densities by threefold. The procedure for preparation of the nanoalloy catalyst is straightforward and appears to be generally applicable to the preparation of catalytic electrodes for incorporation into electrolysis devices.

Soluble porous carbon cage-encapsulated highly active metal nanoparticle catalysts

2021 ◽  
Author(s):  
Hangyu Liu ◽  
Liyu Chen ◽  
Chun-Chao Hou ◽  
Yong-Sheng Wei ◽  
Qiang Xu
Keyword(s):  
Porous Carbon ◽  
Metal Organic Framework ◽  
Metal Nanoparticle ◽  
Hydrogen Peroxide Decomposition ◽  
Carbon Cage ◽  
Nanoparticle Catalysts ◽  
Highly Active ◽  
Active Metal ◽  
Peroxide Decomposition ◽  
Metal Organic

Metal nanoparticles are encapsulated within soluble porous carbon cages by a silica-shelled metal–organic framework pyrolysis approach. The catalyst shows high catalytic activities for hydrogen peroxide decomposition and ammonia borane hydrolysis.

Transformation of Silanes into Silanols using Water and Recyclable Metal Nanoparticle Catalysts

ChemCatChem ◽  
2012 ◽  
Vol 4 (4) ◽  
pp. 521-524 ◽  
Author(s):  
Mina Jeon ◽  
Junghoon Han ◽  
Jaiwook Park
Keyword(s):  
Metal Nanoparticle ◽  
Nanoparticle Catalysts

Nanofabrication of Densely Packed Metal—Polymer Arrays for Surface-Enhanced Raman Spectrometry

2005 ◽  
Vol 59 (12) ◽  
pp. 1501-1508 ◽  
Author(s):  
M. A. De Jesús ◽  
K. S. Giesfeldt ◽  
J. M. Oran ◽  
N. A. Abu-Hatab ◽  
N. V. Lavrik ◽  
...  
Keyword(s):  
Rational Design ◽  
Substrate Surface ◽  
Surface Enhanced Raman Spectroscopy ◽  
Metal Nanoparticle ◽  
Laser Source ◽  
Homogeneous Distribution ◽  
Excitation Wavelength ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanoscale Features

A key element to improve the analytical capabilities of surface-enhanced Raman spectroscopy (SERS) resides in the performance characteristics of the SERS-active substrate. Variables such as shape, size, and homogeneous distribution of the metal nanoparticles throughout the substrate surface are important in the design of more analytically sensitive and reliable substrates. Electron-beam lithography (EBL) has emerged as a powerful tool for the systematic fabrication of substrates with periodic nanoscale features. EBL also allows the rational design of nanoscale features that are optimized to the frequency of the Raman laser source. In this work, the efficiency of EBL fabricated substrates are studied by measuring the relative SERS signals of Rhodamine 6G and 1,10-phenanthroline adsorbed on a series of cubic, elliptical, and hexagonal nanopatterned pillars of ma-N 2403 directly coated by physical vapor deposition with 25 nm films of Ag or Au. The raw analyte SERS signals, and signals normalized to metal nanoparticle surface area or numbers of loci, are used to study the effects of nanoparticle morphology on the performance of a rapidly created, diverse collection of substrates. For the excitation wavelength used, the nanoparticle size, geometry, and orientation of the particle primary axis relative to the excitation polarization vector, and particularly the density of nanoparticles, are shown to strongly influence substrate performance. A correlation between the inverse of the magnitude of the laser backscatter passed by the spectrometer and SERS activities of the various substrate patterns is also noted and provides a simple means to evaluate possible efficient coupling of the excitation radiation to localized surface plasmons for Raman enhancement.

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