scholarly journals H2 Reduction Annealing Induced Phase Transition and Improvements on Redox Durability of Pt Cluster-Decorated Cu@Pd Electrocatalysts in Oxygen Reduction Reaction

ACS Omega ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 971-982 ◽  
Author(s):  
Dinesh Bhalothia ◽  
Cheng-Yang Lin ◽  
Che Yan ◽  
Ya-Tang Yang ◽  
Tsan-Yao Chen
Keyword(s):  
Phase Transition ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Reduction Annealing ◽  
Pt Cluster

Sub-nanometer Pt cluster decoration enhances the oxygen reduction reaction performances of NiOx supported Pd nano-islands

2020 ◽  
Vol 4 (2) ◽  
pp. 809-823 ◽  
Author(s):  
Dinesh Bhalothia ◽  
Sheng Dai ◽  
Sheng-Po Wang ◽  
Che Yan ◽  
Tzu-Hsi Huang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Galvanic Replacement ◽  
Hydration Kinetics ◽  
Defect Sites ◽  
Pt Cluster ◽  
Orr Activity ◽  
Supported Pd

With suitable Pt4+ loading for galvanic replacement, Pt clusters will fill in the defect sites on Ni@Pd–Pt (step 1 and step 2). In this event, the overlap between O2 splitting and hydration kinetics optimize the ORR activity of a Pt cluster decorated Ni@Pd NC.

Effects of Pt metal loading on the atomic restructure and oxygen reduction reaction performance of Pt-cluster decorated Cu@Pd electrocatalysts

2019 ◽  
Vol 3 (7) ◽  
pp. 1668-1681 ◽  
Author(s):  
Dinesh Bhalothia ◽  
Cheng-Yang Lin ◽  
Che Yan ◽  
Ya-Tang Yang ◽  
Tsan-Yao Chen
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Pd Nanoparticles ◽  
Reduction Reaction ◽  
Galvanic Replacement ◽  
Metal Loading ◽  
Disordered Structure ◽  
Pt Cluster ◽  
Reaction Performance

Galvanic replacement dominates the structure of Pt decorated Cu@Pd nanoparticles. With proper Pt loading, it converts Cu@Pd-Pt from a surface disordered structure to multiple twin particles (MTPS) and gain the highest stability in the oxygen reduction reaction among the experimental samples.

A phase-transition-assisted method for the rational synthesis of nitrogen-doped hierarchically porous carbon materials for the oxygen reduction reaction

2018 ◽  
Vol 6 (3) ◽  
pp. 878-883 ◽  
Author(s):  
Wei Li ◽  
Wei Ding ◽  
Jinxia Jiang ◽  
Qian He ◽  
Sicheng Tao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Reduction Reaction ◽  
Excellent Performance ◽  
Hierarchically Porous ◽  
Nitrogen Doped ◽  
Porous Carbon Materials

By a novel phase-transition-assisted strategy, the porosity of carbon materials can be fine tuned from the micrometer to the nanometer level, and the functionality of carbon surfaces can be better controlled to achieve an excellent performance for the catalysis of the oxygen reduction reaction.

N and S Co-doped Ordered Mesoporous Carbon: An Efficient Electrocatalyst for Oxygen Reduction Reaction in Microbial Fuel Cells

2020 ◽  
Vol 16 (4) ◽  
pp. 625-638
Author(s):  
Leila Samiee ◽  
Sedigheh Sadegh Hassani
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Microbial Fuel Cells ◽  
Carbon Materials ◽  
Reduction Reaction ◽  
Carbon Substrate ◽  
Promising Candidate ◽  
X Ray ◽  
Carbon Framework ◽  
Co Doped

Background: Porous carbon materials are promising candidate supports for various applications. In a number of these applications, doping of the carbon framework with heteroatoms provides a facile route to readily tune the carbon properties. The oxygen reduction reaction (ORR), where the reaction can be catalyzed without precious metals is one of the common applications for the heteroatom-doped carbons. Therefore, heteroatom doped catalysts might have a promising potential as a cathode in Microbial fuel cells (MFCs). MFCs have a good potential to produce electricity from biological oxidization of wastes at the anode and chemical reduction at the cathode. To the best of our knowledge, no studies have been yet reported on utilizing Sulfur trioxide pyridine (STP) and CMK-3 for the preparation of (N and S) doped ordered porous carbon materials. The presence of highly ordered mesostructured and the synergistic effect of N and S atoms with specific structures enhance the oxygen adsorption due to improving the electrocatalytic activity. So the optimal catalyst, with significant stability and excellent tolerance of methanol crossover can be a promising candidate for even other storage and conversion devices. Methods: The physico-chemical properties of the prepared samples were determined by Small Angle X-ray Diffraction (SAXRD), N2 sorption-desorption, Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microscopy (FESEM) and X-ray Photoelectron Spectroscopy (XPS). The prepared samples were further applied for oxygen reduction reaction (ORR) and the optimal cathode was tested with the Microbial Fuel Cell (MFC) system. Furthermore, according to structural analysis, The HRTEM, and SAXRD results confirmed the formation of well-ordered hexagonal (p6mm) arrays of mesopores in the direction of (100). The EDS and XPS approved that N and S were successfully doped into the CMK-3 carbon framework. Results: Among all the studied CMK-3 based catalysts, the catalyst prepared by STP precursor and pyrolysis at 900°C exhibited the highest ORR activity with the onset potential of 1.02 V vs. RHE and 4 electron transfer number per oxygen molecule in 0.1 M KOH. The high catalyst durability and fuel-crossover tolerance led to stable performance of the optimal cathode after 5000 s operation, while the Pt/C cathode-based was considerably degraded. Finally, the MFC system with the optimal cathode displayed 43.9 mW·m-2 peak power density showing even reasonable performance in comparison to a Pt/C 20 wt.%.cathode. Conclusions: The results revealed that the synergistic effect of nitrogen and sulfur co-doped on the carbon substrate structure leads to improvement in catalytic activity. Also, it was clearly observed that the porous structure and order level of the carbon substrate could considerably change the ORR performance.

Single copper sites dispersed on defective TiO2−x as a synergistic oxygen reduction reaction catalyst

2021 ◽  
Vol 154 (3) ◽  
pp. 034705
Author(s):  
Minchan Li ◽  
Ning Qin ◽  
Zongwei Ji ◽  
Qingmeng Gan ◽  
Zhenyu Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Copper Sites ◽  
Oxygen Reduction Reaction Catalyst

scholarly journals Biomass wood-derived efficient Fe–N–C catalysts for oxygen reduction reaction

2021 ◽  
Author(s):  
Dingding Li ◽  
Zheng Han ◽  
Kunyue Leng ◽  
Shenghua Ma ◽  
Yi Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction

Assessing the Oxygen Reduction Reaction by a 2-electron Mechanism on Ceria Surfaces

2021 ◽  
Author(s):  
Mauro C dos Santos ◽  
Lanna Lucchetti ◽  
James Almeida ◽  
Pedro Alves da Silva Autreto
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction

The 2-electron pathway of the oxygen reduction reaction is an unwanted process in the development of fuel cells. In contrast, it has gained the scientific community’s attention due to its...

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