Non-nitrogen doped and non-metal oxygen reduction electrocatalysts based on carbon nanotubes: mechanism and origin of ORR activity

2014 ◽  
Vol 7 (6) ◽  
pp. 1950-1958 ◽  
Author(s):  
Keiko Waki ◽  
Raymond A. Wong ◽  
Haryo S. Oktaviano ◽  
Takuya Fujio ◽  
Takuro Nagai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Oxygen Reduction ◽  
Functional Groups ◽  
Topological Defects ◽  
Nitrogen Doped ◽  
Metal Impurities ◽  
Oxygen Functional Groups ◽  
Orr Activity ◽  
The Creation

The proposed origin of the improved ORR activity is unlikely to be from residual metal impurities but from the creation of topological defects caused by the removal of high temperature CO desorbing oxygen functional groups.

Oxidized carbon nanotubes as an efficient metal-free electrocatalyst for the oxygen reduction reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41901-41904 ◽  
Author(s):  
Xin Wang ◽  
Canbin Ouyang ◽  
Shuo Dou ◽  
Dongdong Liu ◽  
Shuangyin Wang
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Functional Groups ◽  
Reduction Reaction ◽  
Metal Free ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes ◽  
Orr Activity

Acid treated method can efficiently incorporate a large number of oxygen containing functional groups including –OH, –COOH, CO which play a key role in the enhancement of ORR activity.

scholarly journals In situ synthesis of metal embedded nitrogen doped carbon nanotubes as an electrocatalyst for the oxygen reduction reaction with high activity and stability

RSC Advances ◽  
2018 ◽  
Vol 8 (44) ◽  
pp. 25051-25056 ◽  
Author(s):  
Yanhong Yin ◽  
Hengbo Zhang ◽  
Rongzhen Gao ◽  
Aili Wang ◽  
Xinxin Mao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Activity ◽  
Reduction Reaction ◽  
In Situ Synthesis ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

In this work, a Co–N doped carbon nanotube (CNT) catalyst was fabricated via a simple pyrolysis approach.

O2 and H2O2 transformation steps for the oxygen reduction reaction catalyzed by graphitic nitrogen-doped carbon nanotubes in acidic electrolyte from first principles calculations

2015 ◽  
Vol 17 (34) ◽  
pp. 21950-21959 ◽  
Author(s):  
Yuhang Li ◽  
Guoyu Zhong ◽  
Hao Yu ◽  
Hongjuan Wang ◽  
Feng Peng
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
First Principles ◽  
Reduction Reaction ◽  
First Principles Calculations ◽  
Nitrogen Doped ◽  
Acidic Electrolyte ◽  
Nitrogen Doped Carbon ◽  
Mixed Mechanism

DFT calculations reveal a mixed mechanism for the oxygen reduction reaction catalyzed by nitrogen-doped carbon nanotubes in acidic electrolyte.

Nitrogen-doped carbon nanoflowers with in situ generated Fe3C embedded carbon nanotubes for efficient oxygen reduction electrocatalysts

2020 ◽  
Vol 529 ◽  
pp. 147174 ◽  
Author(s):  
Hui Peng ◽  
Miaoran Zhang ◽  
Kanjun Sun ◽  
Xuan Xie ◽  
Haikuo Lei ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

scholarly journals N8− Polynitrogen Stabilized on Nitrogen-Doped Carbon Nanotubes as an Efficient Electrocatalyst for Oxygen Reduction Reaction

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 864 ◽  
Author(s):  
Zhenhua Yao ◽  
Ruiyang Fan ◽  
Wangyang Ji ◽  
Tingxuan Yan ◽  
Maocong Hu
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Temperature Programmed ◽  
Nitrogen Doped Carbon

In this work, non-traditional metal-free polynitrogen chain N8− deposited on a nitrogen-doped carbon nanotubes (PN-NCNT) catalyst was successfully synthesized by a facile cyclic voltammetry (CV) approach, which was further tested in an oxygen reduction reaction (ORR). The formation of PN on NCNT was confirmed by attenuated total reflectance–Fourier transform infrared spectroscopy (ATR-FTIR) and Raman spectroscopy. Partial positive charge of carbon within NCNT facilitated electron transfer and accordingly induced the formation of more PN species compared to CNT substrate as determined by temperature-programmed decomposition (TPD). Rotating disk electrode (RDE) measurements suggested that a higher current density was achieved over PN-NCNT than that on PN-CNT catalyst, which can be attributed to formation of the larger amount of N8− on NCNT. Kinetic study suggested a four-electron pathway mechanism over PN-NCNT. Moreover, it showed long stability and good methanol tolerance, which indicates its great potential application. This work provides insights on designing and synthesizing non-traditional metal-free catalysts for ORR in fuel cells.

scholarly journals ZnCo 2 O 4 Quantum Dots Anchored on Nitrogen‐Doped Carbon Nanotubes as Reversible Oxygen Reduction/Evolution Electrocatalysts

2016 ◽  
Vol 28 (19) ◽  
pp. 3777-3784 ◽  
Author(s):  
Zhao‐Qing Liu ◽  
Hui Cheng ◽  
Nan Li ◽  
Tian Yi Ma ◽  
Yu‐Zhi Su
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Oxygen Reduction ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon
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