نتایج جستجو برای: platinum nanoparticles

تعداد نتایج: 127093  

Journal: :Interface focus 2015
Kosei Ueno Tomoya Oshikiri Xu Shi Yuqing Zhong Hiroaki Misawa

We have successfully developed a plasmon-induced artificial photosynthesis system that uses a gold nanoparticle-loaded oxide semiconductor electrode to produce useful chemical energy as hydrogen and ammonia. The most important feature of this system is that both sides of a strontium titanate single-crystal substrate are used without an electrochemical apparatus. Plasmon-induced water splitting ...

Journal: :Nature chemistry 2014
Patricia Hernandez-Fernandez Federico Masini David N McCarthy Christian E Strebel Daniel Friebel Davide Deiana Paolo Malacrida Anders Nierhoff Anders Bodin Anna M Wise Jane H Nielsen Thomas W Hansen Anders Nilsson Ifan E L Stephens Ib Chorkendorff

Low-temperature fuel cells are limited by the oxygen reduction reaction, and their widespread implementation in automotive vehicles is hindered by the cost of platinum, currently the best-known catalyst for reducing oxygen in terms of both activity and stability. One solution is to decrease the amount of platinum required, for example by alloying, but without detrimentally affecting its propert...

Journal: :Journal of colloid and interface science 2014
Haiyang Cheng Xiangchun Meng Limin He Weiwei Lin Fengyu Zhao

Polyethylene glycol stabilized platinum nanoparticles were immobilized on solid supports such as γ-Al2O3, SBA-15, TiO2 and active carbon, forming supported polyethylene glycol stabilized platinum nanoparticles (SPPNs). In the hydrogenation of p-chloronitrobenzene (p-CNB) in supercritical carbon dioxide (scCO2), the SPPN showed high selectivity to p-chloroaniline (>99.3%) in the whole range of c...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2008
Gordana N Ostojic John R Ireland Mark C Hersam

A method for noncovalent functionalization of DNA-wrapped single-walled carbon nanotubes (SWNTs) using platinum-based DNA cross-linkers is investigated. In particular, cisplatin and potassium tetrachloroplatinate are shown to bind to DNA that encapsulates SWNTs in aqueous solution. The bound platinum salt can then be reduced to decorate the DNA-encapsulated SWNTs with platinum nanoparticles. Th...

Journal: :Advanced materials 2011
Arne Kloke Felix von Stetten Roland Zengerle Sven Kerzenmacher

Porous platinum is of high technological importance due to its various applications in fuel cells, sensors, stimulation electrodes, mechanical actuators and catalysis in general. Based on a discussion of the general principles behind the reduction of platinum salts and corresponding deposition processes this article discusses techniques available for platinum electrode fabrication. The numerous...

Journal: :The Journal of chemical physics 2005
Byeongdu Lee Sönke Seifert Stephen J Riley George Tikhonov Nancy A Tomczyk Stefan Vajda Randall E Winans

The size evolution of platinum nanoparticles formed on a SiO2/Si(111) substrate as a function of the level of surface coverage with deposited clusters has been investigated. The anisotropic shapes of sub-nanometer-size nanoparticles are changed to isotropic on the amorphous substrate as their sizes increased. Using anomalous grazing incidence small-angle x-ray scattering (AGISAXS), the scatteri...

2013
Mahdieh Razmi Ali Akbar Saboury

Introduction: Clinical application of platinum-based anticancer drugs is largely limited by severe toxicity. Drug delivery systems are highly desired for improving the efficacy and applicability of these drugs. This study describes an alternative strategy for the delivery of a new synthesized Pt(II) complex (bipyridin morpholin dithio carbomate Pt(II) nitrate) by its encapsulating in the Beta-C...

2005
Kwong-Yu Chan Jiawen Ren Jin Liu Huanting Wang Jie Ding Kwok-Ying Tsang Chun Lee Hong Kong

Performance of low temperature fuel cells depends critically on the nanostructures of the material components in the electrodes and membranes. Some studies are reported here for 1) mixed metal nanoparticles supported on mesoporous carbon and 2) modification of nanopores of Nafion via in-situ polymerization of furfuryl alcohol. The anodic oxidation of small organic molecules such as alcohols in ...

2005
Chao Liu Xiaowei Wu Timothy Klemmer Nisha Shukla Dieter Weller PennsylVania Anup G. Roy Mihaela Tanase David Laughlin

FePt/iron oxide core/shell nanoparticles are synthesized by a two step polyol process with 1,2hexadecanediol as the reducing reagent. Monodispersed 2.6-nm FePt nanoparticles are first obtained by reduction of iron(III) acetylacetonate and platinum(II) acetylacetonate. These preformed FePt nanoparticles are then used as seeds and an iron oxide shell is formed in the second synthesis step. The ro...

Journal: :Journal of Electroanalytical Chemistry 2021

The methanol oxidation reaction is studied at the single nanoparticle scale under aqueous alkaline conditions. Upon impacting a potentiostated electrode and after ≤ 1 ms steady-state limited catalytic current induced to occur platinum (nominal diameter 50 nm); magnitude of close that seen for both larger arrays nanoparticles polycrystalline ‘bulk’ material suggesting entity activity preserved i...

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