Carbon Supported Pt-Ni Octahedral Electrocatalysts as a Model to Follow Nickel Corrosion and Particle Detachment

2021 ◽  
Author(s):  
Melina Zysler ◽  
Tal Klingbell ◽  
Charles D. Amos ◽  
Paulo Fereira ◽  
David Zitoun
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
High Potential ◽  
High Mass ◽  
Ni Nanoparticles ◽  
Particle Detachment ◽  
Degradation Processes ◽  
Acidic Conditions ◽  
Mass Activity

Pt-Ni nanoparticles (NPs) are used as electrocatalysts toward the oxygen reduction reaction due to their high mass activity. However, degradation processes at the high potential in the acidic conditions of...

Ultrafine Pt–Ni nanoparticles in hollow porous carbon spheres for remarkable oxygen reduction reaction catalysis

2021 ◽  
Author(s):  
Xian-Kai Wan ◽  
Gabor Samjeské ◽  
Hirosuke Matsui ◽  
Chaoqi Chen ◽  
Satoshi Muratsugu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Reduction Reaction ◽  
Ni Nanoparticles ◽  
Carbon Spheres ◽  
Oxygen Reduction Reaction Activity ◽  
Porous Carbon Spheres

Small-sized Pt–Ni nanoparticles were synthesized into hollow porous carbon spheres (HPCS) under molecule assistance. Pt–Ni nanoparticle/HPCS prepared in presence of 2,2′-Dipyridylamine showed excellent oxygen reduction reaction activity/durability.

scholarly journals Enhanced Electrocatalytic Activity and Stability toward the Oxygen Reduction Reaction with Unprotected Pt Nanoclusters

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 955 ◽  
Author(s):  
Jing Liu ◽  
Jiao Yin ◽  
Bo Feng ◽  
Tao Xu ◽  
Fu Wang
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Specific Activity ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Top Down ◽  
Methanol Tolerance ◽  
Pt Nanoclusters ◽  
Mass Activity

The Pt particles within diameters of 1–3 nm known as Pt nanoclusters (NCs) are widely considered to be satisfactory oxygen reduction reaction (ORR) catalysts due to higher electrocatalytic performance and cost effectiveness. However, the utilization of such smaller Pt NCs is always limited by the synthesis strategies, stability and methanol tolerance of Pt. Herein, unprotected Pt NCs (~2.2 nm) dispersed on carbon nanotubes (CNTs) were prepared via a modified top-down approach using liquid Li as a solvent to break down the bulk Pt. Compared with the commercial Pt/C, the resultant Pt NCs/CNTs catalyst (Pt loading: 10 wt.%) exhibited more desirable ORR catalytic performance in 0.1 M HClO4. The specific activity (SA) and mass activity (MA) at 0.9 V for ORR over Pt NCs/CNTs were 2.5 and 3.2 times higher than those over the commercial Pt/C (Pt loading: 20 wt.%). Meanwhile, the Pt NCs/CNTs catalyst demonstrated more satisfactory stability and methanol tolerance. Compared with the obvious loss (~69%) of commercial Pt/C, only a slight current decrease (~10%) was observed for Pt NCs/CNTs after the chronoamperometric measurement for 2 × 104 s. Hence, the as-prepared Pt NCs/CNTs material displays great potential as a practical ORR catalyst.

scholarly journals Ultrafine jagged platinum nanowires enable ultrahigh mass activity for the oxygen reduction reaction

Science ◽  
2016 ◽  
Vol 354 (6318) ◽  
pp. 1414-1419 ◽  
Author(s):  
Mufan Li ◽  
Zipeng Zhao ◽  
Tao Cheng ◽  
Alessandro Fortunelli ◽  
Chih-Yen Chen ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Platinum Nanowires ◽  
Mass Activity

The oxygen reduction reaction at the three-phase boundary: nanoelectrodes modified with Ag nanoclusters

2016 ◽  
Vol 193 ◽  
pp. 241-250 ◽  
Author(s):  
Jan Clausmeyer ◽  
Alexander Botz ◽  
Denis Öhl ◽  
Wolfgang Schuhmann
Keyword(s):  
Mass Transport ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Local Delivery ◽  
Model Systems ◽  
Alkaline Media ◽  
High Mass ◽  
Slow Diffusion ◽  
Ag Nanoclusters

Silver nanoclusters are deposited on bifunctional Θ-shaped nanoelectrodes consisting of a carbon nanoelectrode combined with a hollow nanopipette. The Θ-nanoelectrodes are used as model systems to study interfacial mass transport in gas diffusion electrodes and in particular oxygen-depolarized cathodes (ODC) for the oxygen reduction reaction (ORR) in chlor-alkali electrolysers. By local delivery of O2 gas to the electroactive Ag nanoclusters through the adjacent nanopipette, enhanced currents for the ORR at the Ag nanoparticles are recorded which are not accountable when considering the low solubility and slow diffusion of O2 in highly alkaline media. Instead, local oversaturation of O2 leads to current enhancement at the Ag nanoclusters. Due to the intrinsic high mass transport rates at the nanometric electrodes accompanied by local delivery of reactants, the method generally allows to study electrochemical reactions at single nanoparticles beyond the limitations induced by slow diffusion and low reactant concentration. Kinetic and mechanistic information, for instance derived from Tafel slopes, can be obtained from kinetic regimes not accessible to standard techniques.

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