Novel Mn-/Co-Nx Moieties Captured in N-Doped Carbon Nanotubes for Enhanced Oxygen Reduction Activity and Stability in Acidic and Alkaline Media

2021 ◽  
Author(s):  
Syed Shoaib Ahmad Shah ◽  
Tayyaba Najam ◽  
Muhammad Sufyan Javed ◽  
Mohammed M. Rahman ◽  
Panagiotis Tsiakaras
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction ◽  
Alkaline Media ◽  
Reduction Activity ◽  
Acidic And Alkaline Media

Atomic-scaled cobalt encapsulated in P,N-doped carbon sheaths over carbon nanotubes for enhanced oxygen reduction electrocatalysis under acidic and alkaline media

2017 ◽  
Vol 53 (71) ◽  
pp. 9862-9865 ◽  
Author(s):  
Shiyu Guo ◽  
Pengfei Yuan ◽  
Jianan Zhang ◽  
Pengbo Jin ◽  
Hongming Sun ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction ◽  
Alkaline Media ◽  
Electrocatalytic Performance ◽  
Coaxial Nanocables ◽  
Acidic And Alkaline Media ◽  
Co Doped

Atomic-scaled Co were distributed in N,P co-doped C@CNT coaxial nanocables, exhibiting superior electrocatalytic performance for ORR both in acid and alkaline media.

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.

Highly active Fe–N-doped porous hollow carbon nanospheres as oxygen reduction electrocatalysts in both acidic and alkaline media

Nanoscale ◽  
2020 ◽  
Vol 12 (28) ◽  
pp. 15115-15127 ◽  
Author(s):  
Meng-geng Hao ◽  
Rong-min Dun ◽  
Yu-miao Su ◽  
Wen-mu Li
Keyword(s):  
Oxygen Reduction ◽  
Nitrogen Sources ◽  
Alkaline Media ◽  
Carbon Nanospheres ◽  
Highly Active ◽  
Acidic And Alkaline Media ◽  
Hollow Carbon ◽  
Soft Templates

MF nanospheres decomposed into NH3 and CO2 as soft templates, nitrogen sources and pore-forming agents.

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.

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