scholarly journals Hydrogen Oxidation and Oxygen Reduction Reactions on an OsRu-Based Electrocatalyst Synthesized by Microwave Irradiation

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5692
Author(s):  
Ángela Selva-Ochoa ◽  
Javier Su-Gallegos ◽  
P. J. Sebastian ◽  
Lorena Magallón-Cacho ◽  
Edgar Borja-Arco
Keyword(s):  
Fuel Cells ◽  
Microwave Irradiation ◽  
Oxygen Reduction ◽  
Direct Methanol Fuel Cells ◽  
Hydrogen Oxidation ◽  
Linear Sweep Voltammetry ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Reduction Reactions ◽  
Oxygen Reduction Reactions

This work presents an OsRu-based electrocatalyst synthesis, by a rapid and efficient method through microwave irradiation. The outstanding electrocatalyst shows a dual catalytic activity, demonstrating both hydrogen oxidation and oxygen reduction reactions. The material is structural and morphologically characterized by FT-IR, X-ray diffraction, EDS, and SEM, indicating nanoparticulated Os and Ru metallic phases with a crystallite size of ∼6 nm, calculated by the Scherrer equation. The metal nanoparticles are apparently deposited on a carbonaceous sponge-like morphology structure. Its electrochemical characterization is performed in 0.5 M H2SO4 by the rotating disk electrode technique, employing cyclic and linear sweep voltammetry. Two different ink treatments have been studied to improve the obtained polarization curves. The material was also tested in the presence of methanol for the oxygen reduction reaction, showing an important resistance to this contaminant, making it viable for its use in direct methanol fuel cells (DMFCs) as a cathode and in polymer electrolyte fuel cells (PEMFCs) as an anode as much as a cathode.

Metal molybdate nanorods as non-precious electrocatalysts for the oxygen reduction

2015 ◽  
Vol 08 (03) ◽  
pp. 1540005 ◽  
Author(s):  
Tian Wu ◽  
Lieyu Zhang
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Large Scale ◽  
Linear Sweep Voltammetry ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Alkaline Media ◽  
One Pot ◽  
Metal Molybdate

Development of non-precious electrocatalysts with applicable electrocatalytic activity towards the oxygen reduction reaction (ORR) is important to fulfill broad-based and large-scale applications of metal/air batteries and fuel cells. Herein, nickel and cobalt molybdates with uniform nanorod morphology are synthesized using a facile one-pot hydrothermal method. The ORR activity of the prepared metal molybdate nanorods in alkaline media are investigated by using cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperomety in rotating disk electrode (RDE) techniques. The present study suggests that the prepared metal molybdate nanorods exhibit applicable electrocatalytic activities towards the ORR in alkaline media, promising the applications as non-precious cathode in fuel cells and metal–air batteries.

Selective catalysts for the hydrogen oxidation and oxygen reduction reactions by patterning of platinum with calix[4]arene molecules

2010 ◽  
Vol 9 (12) ◽  
pp. 998-1003 ◽  
Author(s):  
Bostjan Genorio ◽  
Dusan Strmcnik ◽  
Ram Subbaraman ◽  
Dusan Tripkovic ◽  
Goran Karapetrov ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Hydrogen Oxidation ◽  
Reduction Reactions ◽  
Oxygen Reduction Reactions

scholarly journals Methanol-Tolerant M–N–C Catalysts for Oxygen Reduction Reactions in Acidic Media and Their Application in Direct Methanol Fuel Cells

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 650 ◽  
Author(s):  
Carmelo Lo Vecchio ◽  
David Sebastián ◽  
María Lázaro ◽  
Antonino Aricò ◽  
Vincenzo Baglio
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Large Scale ◽  
High Efficiency ◽  
Direct Methanol Fuel Cells ◽  
Cell System ◽  
Rotating Disk Electrode ◽  
Capital Costs ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Direct methanol fuel cells (DMFCs) are emerging technologies for the electrochemical conversion of the chemical energy of a fuel (methanol) directly into electrical energy, with a low environmental impact and high efficiency. Yet, before this technology can reach a large-scale diffusion, specific issues must be solved, in particular, the high cost of the cell components. In a direct methanol fuel cell system, high capital costs are mainly derived from the use of noble metal catalysts; therefore, the development of low-cost electro-catalysts, satisfying the target requirements of high performance and durability, represents an important challenge. The research is currently addressed to the development of metal–nitrogen–carbon (M–N–C) materials as cheap and sustainable catalysts for the oxygen reduction reaction (ORR) in an acid environment, for application in polymer electrolyte fuel cells fueled by hydrogen or alcohol. In particular, this mini-review summarizes the recent advancements achieved in DMFCs using M–N–C catalysts. The presented analysis is restricted to M–N–C catalysts mounted at the cathode of a DMFC or investigated in rotating disk electrode (RDE) configuration for the ORR in the presence of methanol in order to study alcohol tolerance. The main synthetic routes and characteristics of the catalysts are also presented.

Polymer Electrolyte Fuel Cells Employing Heteropolyacids as Redox Mediators for Oxygen Reduction Reactions: Pt-Free Cathode Systems

2016 ◽  
Vol 8 (28) ◽  
pp. 18119-18125 ◽  
Author(s):  
Toshiaki Matsui ◽  
Eri Morikawa ◽  
Shintaro Nakada ◽  
Takeou Okanishi ◽  
Hiroki Muroyama ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Redox Mediators ◽  
Reduction Reactions ◽  
Oxygen Reduction Reactions

Mn-Co oxide/PEDOT as a bifunctional electrocatalyst for oxygen evolution/reduction reactions

2015 ◽  
Vol 1777 ◽  
pp. 1-6 ◽  
Author(s):  
Elaheh Davari ◽  
Douglas G. Ivey
Keyword(s):  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Linear Sweep Voltammetry ◽  
Microstructural Characterization ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Bifunctional Electrocatalyst ◽  
Bifunctional Electrocatalysts ◽  
Anodic Electrodeposition

ABSTRACTBifunctional electrocatalysts, which facilitate the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), are vital components in advanced metal-air batteries. Results are presented for carbon-free, nanocrystalline, rod-like, Mn-Co oxide/PEDOT bifunctional electrocatalysts, prepared by template-free sequential anodic electrodeposition. Electrochemical characterization of synthesized electrocatalysts, with and without a conducting polymer (PEDOT) coating, was performed using cyclic voltammetry (CV) and linear sweep voltammetry (LSV). In addition, microstructural characterization was conducted using SEM, TEM, STEM and XPS. Mn-Co oxide/PEDOT showed improved ORR/OER performance relative to Mn-Co oxide and PEDOT. On the basis of rotating disk electrode (RDE) experiments, Mn-Co oxide/PEDOT displayed the desired 4-electron transfer oxygen reduction pathway. Comparable ORR activity and superior OER activity relative to commercial Pt/C were observed.

Sign in / Sign up

Export Citation Format

Share Document