In situ formation of nitrogen-doped carbon nanoparticles on hollow carbon spheres as efficient oxygen reduction electrocatalysts

Nanoscale ◽  
2016 ◽  
Vol 8 (42) ◽  
pp. 18134-18142 ◽  
Author(s):  
Tingsheng Zhou ◽  
Yao Zhou ◽  
Ruguang Ma ◽  
Zhenzhen Zhou ◽  
Guanghui Liu ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Carbon Nanoparticles ◽  
Carbon Spheres ◽  
Nitrogen Doped ◽  
In Situ Formation ◽  
Hollow Carbon ◽  
Nitrogen Doped Carbon ◽  
Hollow Carbon Spheres

Investigation of hollow nitrogen-doped carbon spheres as non-precious Fe–N4 based oxygen reduction catalysts

2015 ◽  
Vol 3 (30) ◽  
pp. 15473-15481 ◽  
Author(s):  
Jakkid Sanetuntikul ◽  
Chitiphon Chuaicham ◽  
Young-Woo Choi ◽  
Sangaraju Shanmugam
Keyword(s):  
Oxygen Reduction ◽  
Carbon Spheres ◽  
Metal Doping ◽  
Nitrogen Doped ◽  
Reduction Activity ◽  
Oxygen Reduction Catalysts ◽  
Hollow Carbon ◽  
Nitrogen Doped Carbon ◽  
Reduction Catalysts ◽  
Hollow Carbon Spheres

The effect of nitrogen type and content along with metal doping in hollow carbon spheres on oxygen reduction activity is described.

Green self-activation engineering of metal-organic frameworks derived hollow nitrogen-doped carbon spheres towards supercapacitors

2022 ◽  
Author(s):  
Jinyang Zhang ◽  
Dongxu Wu ◽  
Qian Zhang ◽  
Anning Zhang ◽  
Jinfeng Sun ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Carbon Spheres ◽  
Nitrogen Doped ◽  
Metal Organic ◽  
Hollow Carbon ◽  
Nitrogen Doped Carbon ◽  
Hollow Carbon Spheres

Recently, hollow carbon spheres (HCSs) have drawn intensive attentions towards supercapacitors due to their inherently structural merits. However, the exploration of simple yet efficient activation strategies is always a challenge...

scholarly journals Fe atoms anchored on defective nitrogen doped hollow carbon spheres as efficient electrocatalysts for oxygen reduction reaction

Nano Research ◽  
2020 ◽  
Author(s):  
Panpan Su ◽  
Wenjuan Huang ◽  
Jiangwei Zhang ◽  
Utsab Guharoy ◽  
Qinggang Du ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Density Functional ◽  
Reduction Reaction ◽  
Carbon Spheres ◽  
Coordination Structure ◽  
Nitrogen Doped ◽  
Orr Activity ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

AbstractDefective electrocatalysts, especially for intrinsic defective carbon, have aroused a wide concern owing to high spin and charge densities. However, the designated nitrogen species favorable for creating defects by the removal of nitrogen, and the influence of defects for the coordination structure of active site and oxygen reduction reaction (ORR) activity have not been elucidated. Herein, we designed and synthesized a pair of electrocatalysts, denoted as Fe-N/C and Fe-ND/C for coordination sites of atomic iron-nitrogen and iron-nitrogen/defect configuration embedded in hollow carbon spheres, respectively, through direct pyrolysis of their corresponding hollow carbon spheres adsorbed with Fe(acac)3. The nitrogen defects were fabricated via the evaporation of pyrrolic-N on nitrogen doped hollow carbon spheres. Results of comparative experiments between Fe-N/C and Fe-ND/C reveal that Fe-ND/C shows superior ORR activity with an onset potential of 30 mV higher than that of Fe-N/C. Fe-ND sites are more favorable for the enhancement of ORR activity. Density functional theory (DFT) calculation demonstrates that Fe-ND/C with proposed coordination structure of FeN4−x (0<x<4) anchored by OH as axial ligand during ORR, weakens the strong binding of OH* intermediate and promotes the desorption of OH* as rate-determining step for ORR in alkaline electrolyte. Thus, Fe-ND/C electrocatalysts present much better ORR activity compared with that of Fe-N/C with proposed coordination structure of FeN4.

Synergistic Effect of Nitrogen in Cobalt Nitride and Nitrogen-Doped Hollow Carbon Spheres for the Oxygen Reduction Reaction

ChemCatChem ◽  
2015 ◽  
Vol 7 (12) ◽  
pp. 1826-1832 ◽  
Author(s):  
Xing Zhong ◽  
Lin Liu ◽  
Yu Jiang ◽  
Xinde Wang ◽  
Lei Wang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Carbon Spheres ◽  
Nitrogen Doped ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Nanoporous nitrogen-doped graphitic carbon hollow spheres with enhanced electrochemical properties

2021 ◽  
Vol 5 (20) ◽  
pp. 7645-7653
Author(s):  
Partha Bairi ◽  
Kausik Sardar ◽  
Madhupriya Samanta ◽  
Kausik Chanda ◽  
Kalyan Kumar Chattopadhyay
Keyword(s):  
Electrochemical Properties ◽  
Oxygen Reduction ◽  
Nitrogen Doping ◽  
Hollow Spheres ◽  
Graphitic Carbon ◽  
Carbon Spheres ◽  
Nitrogen Doped ◽  
Reduction Activity ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

The direct pyrolysis of nanostructured poly(N-methylaniline) (PNMA) produced nanoporous hollow carbon spheres with a high atomic percentage of nitrogen doping, and these displayed enhanced oxygen reduction activity and supercapacitive properties.

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