Electrochemical Hydrogenation of Toluene to Methylcyclohexane over Rh-Modified Pt Nanoparticles: Effect of Rh Coverage and Electrochemical Surface Area

Pt nanoparticles supported on nitrogen doped carbon (Pt/CN) catalysts with different surface areas were obtained and characterized by transmission electron microscope （TEM） and brunner-emmet-teller （BET）. The characterized results showed that Pt nanoparticles dispersed uniformly on the support surface, and the surface area of the Pt/CN catalyst increased with the increase of annealing temperature. Subsequently, the catalytic performance of Pt/CN catalysts for methylcyclohexane dehydrogenation was studied. The activity of Pt/CN catalysts in methylcyclohexane dehydrogenation increased with the increase of the surface area, Pt/CN-1000 catalyst has the largest surface area and the highest catalytic activity, with the methylcyclohexane conversion of 99% and the TOF value of 424.78 h-1 at 180 ℃ for 150 minutes.

Download Full-text

Elucidating the degradation mechanism of the cathode catalyst of PEFCs by a combination of electrochemical methods and X-ray fluorescence spectroscopy

Physical Chemistry Chemical Physics ◽

10.1039/c6cp03795j ◽

2016 ◽

Vol 18 (32) ◽

pp. 22407-22415 ◽

Cited By ~ 10

Author(s):

J. Monzó ◽

D. F. van der Vliet ◽

A. Yanson ◽

P. Rodriguez

Keyword(s):

Fluorescence Spectroscopy ◽

Surface Area ◽

Degradation Mechanism ◽

Electrochemical Methods ◽

Cathode Catalyst ◽

Degradation Mechanisms ◽

Electrochemical Surface Area ◽

X Ray

In this study, we report a methodology which enables the determination of the degradation mechanisms responsible for catalyst deterioration under different accelerated stress protocols (ASPs) by combining measurements of the electrochemical surface area (ECSA) and Pt content (by X-ray fluorescence).

Download Full-text

Structure-dependent selective hydrogenation of cinnamaldehyde over high-surface-area CeO 2 -ZrO 2 composites supported Pt nanoparticles

Chemical Engineering Journal ◽

10.1016/j.cej.2017.04.026 ◽

2017 ◽

Vol 322 ◽

pp. 234-245 ◽

Cited By ~ 31

Author(s):

Shaoping Wei ◽

Yitong Zhao ◽

Guoli Fan ◽

Lan Yang ◽

Feng Li

Keyword(s):

Surface Area ◽

Selective Hydrogenation ◽

High Surface ◽

High Surface Area ◽

Pt Nanoparticles

Download Full-text

Influence of Growth Mechanism and Potential Cycling on the Active Surface Area of Electrodeposited Highly Porous Pt Nanoparticles

ECS Meeting Abstracts ◽

10.1149/ma2018-01/18/1207 ◽

2018 ◽

Keyword(s):

Surface Area ◽

Growth Mechanism ◽

Pt Nanoparticles ◽

Active Surface ◽

Active Surface Area ◽

Potential Cycling ◽

Highly Porous

Download Full-text

Improvement of Catalytic Activity of Platinum Nanoparticles Decorated Carbon Graphene Composite on Oxygen Electroreduction for Fuel Cells

Processes ◽

10.3390/pr7090586 ◽

2019 ◽

Vol 7 (9) ◽

pp. 586 ◽

Cited By ~ 7

Author(s):

Halima Begum ◽

Young-Bae Kim

Keyword(s):

Catalytic Activity ◽

Fuel Cells ◽

Surface Area ◽

High Performance ◽

Pt Nanoparticles ◽

Reduction Reaction ◽

Graphene Sheets ◽

Crossover Effect ◽

Onset Potential ◽

Monolayer Dispersion

High-performance platinum (Pt)-based catalyst development is crucially important for reducing high overpotential of sluggish oxygen reduction reaction (ORR) at Pt-based electrocatalysts, although the high cost and scarcity in nature of Pt are profoundly hampering the practical use of it in fuel cells. Thus, the enhancing activity of Pt-based electrocatalysts with minimal Pt-loading through alloy, core−shell or composite making has been implemented. This article deals with enhancing electrocatalytic activity on ORR of commercially available platinum/carbon (Pt/C) with graphene sheets through a simple composite making. The Pt/C with graphene sheets composite materials (denoted as Pt/Cx:G10−x) have been characterized by several instrumental measurements. It shows that the Pt nanoparticles (NPs) from the Pt/C have been transferred towards the π-conjugated systems of the graphene sheets with better monolayer dispersion. The optimized Pt/C8:G2 composite has higher specific surface area and better degree of graphitization with better dispersion of NPs. As a result, it shows not only stable electrochemical surface area but also enhanced ORR catalytic activity in respect to the onset potential, mass activity and electron transfer kinetics. As shown by the ORR, the Pt/C8:G2 composite is also better resistive to the alcohol crossover effect and more durable than the Pt/C.

Download Full-text