Facile and scalable synthesis of coal tar-derived, nitrogen and sulfur-codoped carbon nanotubes with superior activity for O2 reduction by employing an evocating agent

2015 ◽  
Vol 3 (45) ◽  
pp. 22723-22729 ◽  
Author(s):  
Ziwu Liu ◽  
Xin Fu ◽  
Xianyong Wei ◽  
Feng Peng
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Coal Tar ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
O2 Reduction ◽  
Acidic And Alkaline Media ◽  
Scalable Synthesis

Nitrogen and sulfur-codoped carbon nanotubes were synthesized with coal tar as nitrogen and sulfur precursors by employing the evocating agent of dicyandiamide. Resultant samples exhibited superior activities for the oxygen reduction reaction in both acidic and alkaline media.

scholarly journals Superior FexN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

2020 ◽  
Vol 9 (1) ◽  
pp. 843-852
Author(s):  
Hunan Jiang ◽  
Jinyang Li ◽  
Mengni Liang ◽  
Hanpeng Deng ◽  
Zuowan Zhou
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Current Density ◽  
Active Sites ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Acidic Media ◽  
Onset Potential ◽  
Acidic And Alkaline Media ◽  
The Stability

AbstractAlthough Fe–N/C catalysts have received increasing attention in recent years for oxygen reduction reaction (ORR), it is still challenging to precisely control the active sites during the preparation. Herein, we report FexN@RGO catalysts with the size of 2–6 nm derived from the pyrolysis of graphene oxide and 1,1′-diacetylferrocene as C and Fe precursors under the NH3/Ar atmosphere as N source. The 1,1′-diacetylferrocene transforms to Fe3O4 at 600°C and transforms to Fe3N and Fe2N at 700°C and 800°C, respectively. The as-prepared FexN@RGO catalysts exhibited superior electrocatalytic activities in acidic and alkaline media compared with the commercial 10% Pt/C, in terms of electrochemical surface area, onset potential, half-wave potential, number of electrons transferred, kinetic current density, and exchange current density. In addition, the stability of FGN-8 also outperformed commercial 10% Pt/C after 10000 cycles, which demonstrates the as-prepared FexN@RGO as durable and active ORR catalysts in acidic media.

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.

2D Layered non-precious metal mesoporous electrocatalysts for enhanced oxygen reduction reaction

2017 ◽  
Vol 5 (10) ◽  
pp. 4868-4878 ◽  
Author(s):  
Lili Huo ◽  
Baocang Liu ◽  
Geng Zhang ◽  
Rui Si ◽  
Jian Liu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Specific Surface ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Precious Metal ◽  
Reduction Reaction ◽  
High Specific Surface Area ◽  
Alkaline Media ◽  
Homogeneous Distribution ◽  
Acidic And Alkaline Media

2D Layered meso-M/N-C/N-G nanocomposites with high specific surface area, homogeneous distribution of ultra-small M-N-C nanoparticles less than 5 nm, and mesopores with a size of ∼3.6 nm exhibit excellent electrocatalytic activity toward oxygen reduction reaction (ORR) in acidic and alkaline media.

scholarly journals Some reflections on the understanding of the oxygen reduction reaction at Pt(111)

2013 ◽  
Vol 4 ◽  
pp. 956-967 ◽  
Author(s):  
Ana M Gómez-Marín ◽  
Ruben Rizo ◽  
Juan M Feliu
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Oxidation ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Oxidation Reactions ◽  
Vicinal Surfaces ◽  
Cooperative Approach ◽  
Acidic And Alkaline Media ◽  
The Right

The oxygen reduction reaction (ORR) is a pivotal process in electrochemistry. Unfortunately, after decades of intensive research, a fundamental knowledge about its reaction mechanism is still lacking. In this paper, a global and critical view on the most important experimental and theoretical results regarding the ORR on Pt(111) and its vicinal surfaces, in both acidic and alkaline media, is taken. Phenomena such as the ORR surface structure sensitivity and the lack of a reduction current at high potentials are discussed in the light of the surface oxidation and disordering processes and the possible relevance of the hydrogen peroxide reduction and oxidation reactions in the ORR mechanism. The necessity to build precise and realistic reaction models, which are deducted from reliable experimental results that need to be carefully taken under strict working conditions is shown. Therefore, progress in the understanding of this important reaction on a molecular level, and the choice of the right approach for the design of the electrocatalysts for fuel-cell cathodes is only possible through a cooperative approach between theory and experiments.

Comparative Study of the Oxygen Reduction Reaction on Pyrolyzed FePc in Acidic and Alkaline Media

2018 ◽  
Vol 5 (24) ◽  
pp. 3946-3952 ◽  
Author(s):  
Xue Zhang ◽  
Chi Chen ◽  
Jiao Dong ◽  
Rui‐Xiang Wang ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Comparative Study ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Acidic And Alkaline Media
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