scholarly journals Nano-Pt Skin Coated Carbonized Wood Chips with High Catalytic Activity for Electrocatalytic Oxidation of Methanol

2018 ◽  
pp. 2758-2765
Author(s):  
Chunyong Zhang ◽  
Keyword(s):  
Catalytic Activity ◽  
Electrocatalytic Oxidation ◽  
Wood Chips ◽  
High Catalytic Activity ◽  
Oxidation Of Methanol ◽  
Carbonized Wood

Nanoporous twinned PtPd with highly catalytic activity and stability

2015 ◽  
Vol 3 (5) ◽  
pp. 2050-2056 ◽  
Author(s):  
Xuefeng Zhang ◽  
Pengfei Guan ◽  
Lidija Malic ◽  
Michel Trudeau ◽  
Federico Rosei ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Electrochemical Oxidation ◽  
High Density ◽  
Atomic Scale ◽  
High Catalytic Activity ◽  
Twin Boundaries ◽  
Oxidation Of Methanol ◽  
Overall Performance

Nanoporous composition-tunable PtPd catalysts, combining with a high density of twin boundaries and atomic-scale Pt–Pd interfaces, can be synthesized by a simple thermal-decomposition strategy. The most optimized PtPd represents the superior overall performance high catalytic activity and stability in the electrochemical oxidation of methanol.

Electrocatalytic Oxidation of Methanol on an Pd/Pyy/Niad-atoms Electrode

2013 ◽  
Vol 10 (5) ◽  
Author(s):  
Mohamed Abdelfattah Ibrahim ◽  
Taha Hanfy ◽  
A. A. Al-Ghamdi ◽  
Farid El-Tantawy ◽  
Hossam S. Rageb
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Electrocatalytic Oxidation ◽  
Oxidation Of Methanol

In this paper we study the effect of Niad-atoms on the activity of a Pd/Pyy nanocomposite anode, we find that the catalytic activity of an anode towards methanol oxidation increased by threefold in the presence of Niad-atoms.

Catalytic Activity of Porous Pd-Ni Thin Foam towards Electrooxidation of Methanol

2013 ◽  
Vol 16 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Ming Jin ◽  
Houyi Ma
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Low Cost ◽  
Nickel Content ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Oxidation Of Methanol ◽  
One Step ◽  
Dynamic Template ◽  
Electrooxidation Of Methanol

Porous Pd-Ni thin foam was fabricated by a rapid one-step electrodeposition process within hydrogen bubble dynamic template and characterized by SEM, EDS, and cyclic voltammetry. Morphology and composition of the foam can be modified significantly by applying different deposition conditions, such as concentration ratio of Pd (II) ions to Ni (II) ions in electrolytic solution and deposition time. Electrocatalytic activities of the foam towards methanol oxidation in alkaline media were investigated, which depend mainly on Pd components and its morphology. Low nickel content can assist Pd further enhance the electrocatalytic performance, particularly the tolerance to intermediates of methanol oxidation, while high nickel content brings adverse effect. The high catalytic activity and the low cost of the Pd-Ni foams enable them to be promising electrocatalysts for the oxidation of methanol in alkaline media.

High catalytic activity of ultrafine nanoporous palladium for electro-oxidation of methanol, ethanol, and formic acid

2009 ◽  
Vol 11 (10) ◽  
pp. 1896-1899 ◽  
Author(s):  
Xiaoguang Wang ◽  
Weimin Wang ◽  
Zhen Qi ◽  
Changchun Zhao ◽  
Hong Ji ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
High Catalytic Activity ◽  
Oxidation Of Methanol ◽  
Electro Oxidation

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

Ordered Intermetallic Nanoparticles with High Catalytic Activity Prepared by an Electrochemically Induced Phase Transformation

2019 ◽  
Author(s):  
Du Sun ◽  
yunfei wang ◽  
Kenneth Livi ◽  
chuhong wang ◽  
ruichun luo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffusion Mechanism ◽  
Reduction Reaction ◽  
Atomic Scale ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Magnetic Devices ◽  
Disordered Alloys ◽  
Ordered Intermetallic ◽  
Intermetallic Nanoparticles

<div> <p>The synthesis of alloys with long range atomic scale ordering (ordered intermetallics) is an emerging field of nanochemistry. Ordered intermetallic nanoparticles are useful for a wide variety of applications such as catalysis, superconductors, and magnetic devices. However, the preparation of nanostructured ordered intermetallics is challenging in comparison to disordered alloys, hindering progress in materials development. We report a process for converting colloidally synthesized ordered intermetallic PdBi<sub>2</sub> to ordered intermetallic Pd<sub>3</sub>Bi nanoparticles under ambient conditions by an electrochemically induced phase transition. The low melting point of PdBi<sub>2</sub> corresponds to low vacancy formation energies which enables the facile removal of the Bi from the surface, while simultaneously enabling interdiffusion of the constituent atoms via a vacancy diffusion mechanism under ambient conditions. The resulting phase-converted ordered intermetallic Pd<sub>3</sub>Bi exhibits 11x and 3.5x higher mass activty and high methanol tolerance for the oxygen reduction reaction compared to Pt/C and Pd/C, respectively,which is the highest reported for a Pd-based catalyst, to the best of our knowledge. These results establish a key development in the synthesis of noble metal rich ordered intermetallic phases with high catalytic activity, and sets forth guidelines for the design of ordered intermetallic compounds under ambient conditions.</p> </div>

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