Supportless oxygen reduction electrocatalysts of CoCuPt hollow nanoparticles

2010 ◽  
Vol 368 (1927) ◽  
pp. 4261-4274 ◽  
Author(s):  
Jianbo Wu ◽  
Zhenmeng Peng ◽  
Hong Yang
Keyword(s):  
Oxygen Reduction ◽  
Specific Activity ◽  
Reduction Reaction ◽  
Galvanic Replacement ◽  
Hollow Nanoparticles ◽  
Pt Alloy ◽  
Solution Route ◽  
Specific Activities ◽  
Pt Black ◽  
Alloy Catalyst

This paper describes a facile solution route to the synthesis of CoCuPt hollow nanoparticles that readily form chain-like structures in solution. The formation of porous CoCuPt nanostructure is through galvanic replacement with cobalt-containing cores as the templates. This approach does not require the further removal of templates and greatly simplifies the synthetic procedures. These porous CoCuPt nanoparticles can be used as supportless electrocatalysts that exhibit enhanced mass- and area-specific activities in the oxygen reduction reaction (ORR) over commercial Pt black catalysts. The highest ORR specific activity achieved so far for this ternary Pt-alloy catalyst is 0.37 mA cm −2 Pt which is more than double that for Pt black.

Enhanced Oxygen Reduction Reaction by Pd‐Pt Alloy Catalyst with Stabilized Platinum Skin

2020 ◽  
Vol 5 (12) ◽  
pp. 3486-3493
Author(s):  
Anita Swami ◽  
Indrajit Patil ◽  
Moorthi Lokanathan ◽  
Sagar Ingavale ◽  
Bhalchandra Kakade
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Pt Alloy ◽  
Alloy Catalyst

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 Development of Porous Pt Electrocatalysts for Oxygen Reduction and Evolution Reactions

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2398
Author(s):  
Marika Muto ◽  
Mayumi Nagayama ◽  
Kazunari Sasaki ◽  
Akari Hayashi
Keyword(s):  
Oxygen Reduction ◽  
Current Density ◽  
Polymer Electrolyte Membrane ◽  
Porous Metal ◽  
Pem Fuel Cells ◽  
Reduction Reaction ◽  
Electrolyte Membrane ◽  
Catalyst Layers ◽  
Pt Electrocatalysts ◽  
Pt Black

Porous Pt electrocatalysts have been developed as an example of carbon-free porous metal catalysts in anticipation of polymer electrolyte membrane (PEM) fuel cells and PEM water electrolyzers through the assembly of the metal precursor and surfactant. In this study, porous Pt was structurally evaluated and found to have a porous structure composed of connected Pt particles. The resulting specific electrochemical surface area (ECSA) of porous Pt was 12.4 m2 g−1, which was higher than that of commercially available Pt black. Accordingly, porous Pt showed higher oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity than Pt black. When the activity was compared to that of a common carbon-supported electrocatalyst, Pt/ketjen black (KB), porous Pt showed a comparable ORR current density (2.5 mA cm−2 at 0.9 V for Pt/KB and 2.1 mA cm−2 at 0.9 V for porous Pt), and OER current density (6.8 mA cm−2 at 1.8 V for Pt/KB and 7.0 mA cm−1 at 1.8 V), even though the ECSA of porous Pt was only one-sixth that of Pt/KB. Moreover, it exhibited a higher durability against 1.8 V. In addition, when catalyst layers were spray-printed on the Nafion® membrane, porous Pt displayed more uniform layers in comparison to Pt black, showing an advantage in its usage as a thin layer.

scholarly journals Poly (3, 4-ethylene dioxythiophene) Supported Palladium Catalyst prepared by Galvanic Replacement Reaction for Methanol Tolerant Oxygen Reduction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Pandia Rajathi M ◽  
Sheela Berchmans
Keyword(s):  
Oxygen Reduction ◽  
Direct Methanol Fuel Cells ◽  
High Surface ◽  
High Surface Area ◽  
Cost Effective ◽  
Reduction Reaction ◽  
Partial Substitution ◽  
Galvanic Replacement ◽  
Potential Cycling ◽  
Electrochemical Approach

AbstractHerein, we propose a facile electrochemical approach for the synthesis of Pd loaded poly 3, 4-ethylenedioxythiophene (PEDOT) electrodeposited on glassy carbon electrode (GCE) resulting in high surface area. The catalyst preparation is initiated with EDOT polymerization on GCE surface by electrochemical potential cycling method, followed by the electrodeposition of Cu from a 2 mM solution of CuSO4 in 0.1 M NaClO4 at a constant potential of +0.34 V vs. SHE in the form of Cu nanocubes on the PEDOT surface. Pd-PEDOT catalyst was then prepared by the partial substitution of copper by galvanic displacement with various concentrations of PdCl2. The prepared Pd/PEDOT electrocatalyst is found to be methanol resistant indicating its usefulness as fuel cell cathode. The prepared catalyst supports two electron transfer of oxygen reduction reaction in 0.5 M H2SO4. The effects of Pd and Cu contents and the quantity of PEDOT, mass and specific activities were studied. At a relatively low Pd loading of 0.57 ng/cm2, the Pd/PEDOT should be a cost-effective alternative cathode catalyst for direct methanol fuel cells, DMFCs. This work explains the usefulness of PEDOT as good catalyst supporting material which is prepared by an eco-friendly electrochemical route.

Highly enhanced durability of a graphitic carbon layer decorated PtNi3 alloy electrocatalyst toward the oxygen reduction reaction

2019 ◽  
Vol 55 (40) ◽  
pp. 5693-5696 ◽  
Author(s):  
Kui Sun ◽  
Jia Li ◽  
Feng Wang ◽  
Wenxiang He ◽  
Minfei Fei ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Carbon Layer ◽  
Reduction Reaction ◽  
Graphitic Carbon ◽  
Acidic Environment ◽  
First Time ◽  
Alloy Catalyst

An N-doped graphitic carbon layer was for the first time introduced to greatly enhance the durability of a PtNi3/C alloy catalyst in an acidic environment.

scholarly journals Nanostructured Pt-alloy electrocatalysts for PEM fuel cell oxygen reduction reaction

2010 ◽  
Vol 39 (6) ◽  
pp. 2184 ◽  
Author(s):  
Yonghong Bing ◽  
Hansan Liu ◽  
Lei Zhang ◽  
Dave Ghosh ◽  
Jiujun Zhang
Keyword(s):  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Pem Fuel Cell ◽  
Reduction Reaction ◽  
Pt Alloy ◽  
Nanostructured Pt

Hollow porous nanoparticles with Pt skin on a Ag–Pt alloy structure as a highly active electrocatalyst for the oxygen reduction reaction

2016 ◽  
Vol 4 (22) ◽  
pp. 8803-8811 ◽  
Author(s):  
Tao Fu ◽  
Jun Fang ◽  
Chunsheng Wang ◽  
Jinbao Zhao
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Bimetallic Nanoparticles ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Alloy Structure ◽  
Highly Active ◽  
Porous Nanoparticles ◽  
Pt Alloy

Novel hollow porous Ag–Pt bimetallic nanoparticles with better ORR catalytic performance than commercial Pt/C and Ag@Pt nanoparticles.

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