Carbon Nanotubes-Supported Pt Electrocatalysts for O2 Reduction Reaction—Effect of Number of Nanotube Walls

2020 ◽  
Vol 20 (5) ◽  
pp. 2736-2745 ◽  
Author(s):  
Haohua Kuang ◽  
Yi Cheng ◽  
Cheng Qiang Cui ◽  
San Ping Jiang
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Electrocatalytic Activity ◽  
Supported Catalysts ◽  
Polymer Electrolyte Membrane ◽  
Pt Nanoparticles ◽  
Outer Wall ◽  
Reduction Reaction ◽  
O2 Reduction ◽  
Walled Cnts

Carbon nanotubes (CNTs) are one of the most common catalysts supports for the development of electrocatalysts for O2 reduction reaction (ORR) of electrochemical devices such as polymer electrolyte membrane fuel cells (PEMFCs) and metal-air batteries due to their high electrical conductivity and high stability. In addition to the electrical conductivity and stability, the number of inner tubes or walls also influence the electrocatalytic activity of the supported catalysts. Here we study the electrocatalytic activity of Pt nanoparticles (NPs) supported on CNTs (Pt/CNTs) as a function of number of walls towards ORR in both alkaline and acid solutions. The results indicate that the mechanism of ORR on Pt/CNTs does not change with the number of walls of CNTs support but the number of walls of CNTs supports has a significant effect on the electrocatalytic activity of supported Pt NPs. Pt NPs supported on double-walled CNTs (DWCNTs) exhibit a much better activity for ORR, as compared with that supported on single-walled and multi-walled CNTs (SWCNTs and MWCNTs). The high electrocatalytic activity of DWCNTs-supported Pt NPs is contributed to the fast electron transfer between the outer wall and inner tubes of DWCNTs for ORR through electron tunnelling process under the electrochemical polarization driving force.

scholarly journals Synthesis of Fe3O4/Pt Nanoparticles Decorated Carbon Nanotubes and Their Use as Magnetically Recyclable Catalysts

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Hongkun He ◽  
Chao Gao
Keyword(s):  
Carbon Nanotubes ◽  
Pt Nanoparticles ◽  
Reduction Reaction ◽  
Raw Material ◽  
Synthesis Process ◽  
High Catalytic Activity ◽  
Hydrolysis Method ◽  
Recyclable Catalysts ◽  
Temperature Solution ◽  
Average Size

We report a facile approach to prepare Fe3O4/Pt nanoparticles decorated carbon nanotubes (CNTs). The superparamagnetic Fe3O4nanoparticles with average size of4∼5 nm were loaded on the surfaces of carboxyl groups functionalized CNTs via a high-temperature solution-phase hydrolysis method from the raw material of FeCl3. The synthesis process of magnetic CNTs is green and readily scalable. The loading amounts of Fe3O4nanopartilces and the magnetizations of the resulting magnetic CNTs show good tunability. The Pt nanopaticles with average size of 2.5 nm were deposited on the magnetic CNTs through a solution-based method. It is demonstrated that the Fe3O4/Pt nanoparticles decorated CNTs have high catalytic activity in the reduction reaction of 4-nitrophenol and can be readily recycled by a magnet and reused in the next reactions with high efficiencies for at least fifteen successive cycles. The novel CNTs-supported magnetically recyclable catalysts are promising in heterogeneous catalysis applications.

Dendrimer confined Pt nanoparticles: electro-catalytic activity towards the oxygen reduction reaction and its application in polymer electrolyte membrane fuel cells

RSC Advances ◽  
2015 ◽  
Vol 5 (92) ◽  
pp. 75218-75228 ◽  
Author(s):  
A. Arunchander ◽  
S. Gouse Peera ◽  
V. Parthiban ◽  
Srinu Akula ◽  
Tintula Kottakkat ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Polymer Electrolyte Membrane ◽  
Pt Nanoparticles ◽  
Reduction Reaction ◽  
Electrolyte Membrane ◽  
Fuel Cell Cathodes ◽  
Cell Cathodes ◽  
Electro Catalytic Activity

Pt-DENs have been synthesized and immobilized on ester and anhydride functionalized Vulcan XC-72R. These catalysts are utilized as fuel cell cathodes and significant enhanced performances have been achieved with the Pt loading of 0.2 mg cm−2.

Co-supported catalysts on nitrogen and sulfur co-doped vertically-aligned carbon nanotubes for oxygen reduction reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32676-32684 ◽  
Author(s):  
Yunmei Liu ◽  
Bin Zhao ◽  
Ying Zhang ◽  
Huijuan Zhang ◽  
Ke Zhan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Performance ◽  
Supported Catalysts ◽  
Reduction Reaction ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Co Doped

A high-performance ORR catalyst of Co supported on nitrogen and sulfur co-doped VACNTs was fabricated by cobalt sputtering and subsequent annealing in decomposition atmosphere of NH4SCN.

scholarly journals Highly uniform distribution of Pt nanoparticles on N-doped hollow carbon spheres with enhanced durability for oxygen reduction reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 6303-6308 ◽  
Author(s):  
Qiurong Shi ◽  
Chengzhou Zhu ◽  
Mark H. Engelhard ◽  
Dan Du ◽  
Yuehe Lin
Keyword(s):  
Oxygen Reduction Reaction ◽  
Uniform Distribution ◽  
Polymer Electrolyte Membrane ◽  
Pt Nanoparticles ◽  
Reduction Reaction ◽  
Carbon Spheres ◽  
Electrolyte Membrane ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres ◽  
Highly Uniform

Carbon-supported Pt nanostructures currently exhibit great potential in polymer electrolyte membrane fuel cells.

scholarly journals Measurement and study of thermophysical properties of nanofluids with carbon nanotubes

2021 ◽  
Vol 2119 (1) ◽  
pp. 012117
Author(s):  
V Ya Rudyak ◽  
G R Dashapilov ◽  
A A Shupik
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Thermophysical Properties ◽  
Weight Concentration ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Single Walled Cnts ◽  
Walled Cnts

Abstract This article is devoted to the study of the thermophysical properties of nanofluids with single-walled and multi-walled carbon nanotubes (CNT). Their weight concentration varied from 0.05 to 0.2%. Nanofluids, based on ethylene glycol and water, were studied. Dispersants were also used. The diffusion of CNT had been systematically investigated by the method of dynamic light scattering and their effective hydrodynamic dimensions were determined. The rheology and viscosity of all nanofluids were studied. It is shown that nanofluids are either pseu-doplastic or viscoplastic. Their rheology changes with increasing CNT concentration and temperature. However, in all cases, the viscosity of nanofluids with single-walled CNTs is signifi-cantly higher than that of nanofluids with multi-walled CNTs. In the last part, the electrical conductivity of all these nanofluids and the dispersants effect on it are investigated.

Enhanced oxygen reduction reaction performance of size-controlled Pt nanoparticles on polypyrrole-functionalized carbon nanotubes

2019 ◽  
Vol 48 (21) ◽  
pp. 7130-7137 ◽  
Author(s):  
Kentaro Ichihashi ◽  
Satoshi Muratsugu ◽  
Shota Miyamoto ◽  
Kana Sakamoto ◽  
Nozomu Ishiguro ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Pt Nanoparticles ◽  
Reduction Reaction ◽  
Multi Wall Carbon Nanotubes ◽  
Nanoparticle Catalysts ◽  
Pyrrole Monomer ◽  
Reaction Performance ◽  
Size Controlled

Enhanced oxygen reduction reaction performances were achieved on size-controlled Pt nanoparticle catalysts prepared by the copolymerization of a Pt4-pyrrole complex and pyrrole monomer in the presence of multi-wall carbon nanotubes.

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