scholarly journals Carbon Xerogels Hydrothermally Doped with Bimetal Oxides for Oxygen Reduction Reaction

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2446 ◽  
Author(s):  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Nickel Ferrite ◽  
Cobalt Ferrite ◽  
Hydrothermal Process ◽  
Reduction Reaction ◽  
Equivalent Series Resistance ◽  
Carbon Xerogel ◽  
Carbon Xerogels ◽  
Nickel Cobaltite

A total of two carbon xerogels doped with cobalt and nickel were prepared by the sol–gel method. The obtained carbon xerogels underwent further surface modification with three binary metal oxides namely: nickel cobaltite, nickel ferrite, and cobalt ferrite through the hydrothermal method. The mesopore volumes of these materials ranged between 0.24 and 0.40 cm3/g. Moreover, there was a morphology transformation for the carbon xerogels doped with nickel cobaltite, which is in the form of nano-needles after the hydrothermal process. Whereas the carbon xerogels doped with nickel ferrite and cobalt ferrite maintained the normal carbon xerogel structure after the hydrothermal process. The prepared materials were tested as electrocatalysts for oxygen reduction reaction using 0.1 M KOH. Among the prepared carbon xerogels cobalt-doped carbon xerogel had better electrocatalytic performance than the nickel-doped ones. Moreover, the carbon xerogels doped with nickel cobaltite showed excellent activity for oxygen reduction reaction due to mesoporosity development. NiCo2O4/Co-CX showed to be the best electrocatalyst of all the prepared electrocatalysts for oxygen reduction reaction application, exhibiting the highest electrocatalytic activity, lowest onset potential Eonset of −0.06 V, and the lowest equivalent series resistance (ESR) of 2.74 Ω.

scholarly journals Binary and Ternary 3D Nanobundles Metal Oxides Functionalized Carbon Xerogels as Electrocatalysts toward Oxygen Reduction Reaction

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3531 ◽  
Author(s):  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas
Keyword(s):  
Oxygen Reduction Reaction ◽  
Metal Oxides ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Basic Medium ◽  
Equivalent Series Resistance ◽  
Mesopore Volume ◽  
Carbon Xerogel ◽  
Carbon Xerogels ◽  
High Electronic Conductivity

A series of carbon xerogels doped with cobalt, nickel, and iron have been prepared through the sol–gel method. The doped carbon xerogels were further functionalized with binary and ternary transition metal oxides containing Co, Ni, and Zn oxides by the hydrothermal method. A development in the mesopore volume is achieved for functionalized carbon xerogel doped with iron. However, in the functionalization of carbon xerogel with ternary metal oxides, a reduction in pore diameter and mesopore volume is found. In addition, all functionalized metal oxides/carbon are in the form of 3D nanobundles with different lengths and widths. The prepared samples have been tested as electrocatalysts for oxygen reduction reaction (ORR) in basic medium. All composites showed excellent oxygen reduction reaction activity; the low equivalent series resistance of the Zn–Ni–Co/Co–CX composite was especially remarkable, indicating high electronic conductivity. It has been established that the role of Zn in this type of metal oxides nanobundles-based ORR catalyst is not only positive, but its effect could be enhanced by the presence of Ni.

scholarly journals Binary and Ternary 3D nanobundles Transition Metal Oxides Functionalized Carbon Xerogels as Electrocatalysts toward Oxygen Reduction Reaction

2020 ◽  
Author(s):  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction Reaction ◽  
Metal Oxides ◽  
Oxygen Reduction ◽  
Transition Metal Oxides ◽  
Reduction Reaction ◽  
Excellent Performance ◽  
Carbon Xerogel ◽  
Carbon Xerogels

This work describes preparation of novel binary and ternary transition metal oxides functionalized carbon xerogel. The characterization data reveals that the functionalized metal oxides are in the form of nanobundles with different lengths and widths. these prepared electrocatalysts show excellent performance as electrocatalysts for oxygen reduction reaction.

scholarly journals Binary and Ternary 3D nanobundles Transition Metal Oxides Functionalized Carbon Xerogels as Electrocatalysts toward Oxygen Reduction Reaction

2020 ◽  
Author(s):  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction Reaction ◽  
Metal Oxides ◽  
Oxygen Reduction ◽  
Transition Metal Oxides ◽  
Reduction Reaction ◽  
Excellent Performance ◽  
Carbon Xerogel ◽  
Carbon Xerogels

This work describes preparation of novel binary and ternary transition metal oxides functionalized carbon xerogel. The characterization data reveals that the functionalized metal oxides are in the form of nanobundles with different lengths and widths. these prepared electrocatalysts show excellent performance as electrocatalysts for oxygen reduction reaction.

scholarly journals Carbon-Supported Mo2C for Oxygen Reduction Reaction Electrocatalysis

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1805
Author(s):  
Dušan Mladenović ◽  
Milica Vujković ◽  
Slavko Mentus ◽  
Diogo M. F. Santos ◽  
Raquel P. Rocha ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Double Layer ◽  
Molybdenum Carbide ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Carbon Xerogel ◽  
Electrocatalytic Properties ◽  
Molybdenum Carbides

Molybdenum carbide (Mo2C)-based electrocatalysts were prepared using two different carbon supports, commercial carbon nanotubes (CNTs) and synthesised carbon xerogel (CXG), to be studied from the point of view of both capacitive and electrocatalytic properties. Cation type (K+ or Na+) in the alkaline electrolyte solution did not affect the rate of formation of the electrical double layer at a low scan rate of 10 mV s−1. Conversely, the different mobility of these cations through the electrolyte was found to be crucial for the rate of double-layer formation at higher scan rates. Molybdenum carbide supported on carbon xerogel (Mo2C/CXG) showed ca. 3 times higher double-layer capacity amounting to 75 mF cm−2 compared to molybdenum carbide supported on carbon nanotubes (Mo2C/CNT) with a value of 23 mF cm−2 due to having more than double the surface area size. The electrocatalytic properties of carbon-supported molybdenum carbides for the oxygen reduction reaction in alkaline media were evaluated using linear scan voltammetry with a rotating disk electrode. The studied materials demonstrated good electrocatalytic performance with Mo2C/CXG delivering higher current densities at more positive onset and half-wave potential. The number of electrons exchanged during oxygen reduction reaction (ORR) was calculated to be 3, suggesting a combination of four- and two-electron mechanism.

Hydrothermal Synthesis, Characterization and Electrocatalytic Activity of La0.8Sr0.2MnO3 Nanocubes for Oxygen Reduction Reaction

2007 ◽  
Vol 119 ◽  
pp. 275-278 ◽  
Author(s):  
Upendra A. Joshi ◽  
Jae Sung Lee
Keyword(s):  
Hydrothermal Synthesis ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Hydrothermal Process ◽  
Reduction Reaction ◽  
Xrd Pattern ◽  
Phase Purity ◽  
Cyclic Voltametry ◽  
Reduction Current

The La0.8Sr0.2MnO3 nanocubes have been synthesized by simple precipitation followed by hydrothermal process. The as-obtained nanocubes were characterized by SEM, TEM, EDS, XRD and ICP-AA. The SEM and TEM images clearly showed cube type morphology of reaction product. The XRD pattern gave evidence for the phase purity and high crystallinity of the La0.8Sr0.2MnO3 nanocubes. The ICP-AA analysis along with EDS confirms the stoichiometry of the product. Electrochemical activity for oxygen reduction reaction was carried out in 1 M KOH. The oxygen reduction current measured by cyclic voltametry showed six times higher value for nanocubes than that of bulk catalysts of same composition.

Efficient oxygen reduction reaction using mesoporous Ni-doped Co3O4 nanowire array electrocatalysts

2015 ◽  
Vol 3 (36) ◽  
pp. 18372-18379 ◽  
Author(s):  
Xili Tong ◽  
Xinhui Xia ◽  
Congxiu Guo ◽  
Yongqi Zhang ◽  
Jiangping Tu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Nanowire Array ◽  
Hydrothermal Process ◽  
Transfer Characteristic ◽  
Reduction Reaction ◽  
Electrochemical Activity ◽  
Nanowire Arrays ◽  
Simple Hydrothermal Process

Mesoporous Ni-doped Co3O4 nanowire arrays synthesized via a simple hydrothermal process exhibit high electrochemical activity and a four-electron transfer characteristic, with superior tolerance to methanol and CO, and better stability compared to a commercial Pt/C catalyst.

Graphitic mesoporous carbon xerogel as an effective catalyst support for oxygen reduction reaction

2016 ◽  
Vol 41 (21) ◽  
pp. 9204-9210 ◽  
Author(s):  
Hong Jin ◽  
Jinyang Li ◽  
Lianxing Gao ◽  
Fuyu Chen ◽  
Huamin Zhang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Mesoporous Carbon ◽  
Catalyst Support ◽  
Reduction Reaction ◽  
Carbon Xerogel ◽  
Effective Catalyst

scholarly journals Tailoring Synthesis Conditions of Carbon Xerogels towards Their Utilization as Pt-Catalyst Supports for Oxygen Reduction Reaction (ORR)

Catalysts ◽  
2012 ◽  
Vol 2 (4) ◽  
pp. 466-489 ◽  
Author(s):  
Cinthia Alegre ◽  
David Sebastián ◽  
Estela Baquedano ◽  
María Elena Gálvez ◽  
Rafael Moliner ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Pt Catalyst ◽  
Catalyst Supports ◽  
Synthesis Conditions ◽  
Carbon Xerogels

scholarly journals Synergy between iron oxide sites and nitrogen-doped carbon xerogel/diamond matrix for boosting the oxygen reduction reaction

2022 ◽  
Author(s):  
Abdalla Abdelwahab ◽  
Ahmed A. Farghali ◽  
Abeer Enaiet Allah
Keyword(s):  
Fuel Cells ◽  
Iron Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Facile Synthesis ◽  
Carbon Xerogel ◽  
Innovative Design ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

The innovative design and facile synthesis of efficient and stable electrocatalysts for the oxygen reduction reaction (ORR) are crucial in the field of fuel cells.

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